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Guillain-Barré syndrome: The first documented COVID-19–triggered autoimmune neurologic disease | Neurology Neuroimmunology & Neuroinflammation

Guillain-Barré syndrome: The first documented COVID-19–triggered autoimmune neurologic disease | Neurology Neuroimmunology & Neuroinflammation | AntiNMDA | Scoop.it
From nn.neurology.org - June 13, 2020 12:56 PM
Abstract Objective To present the COVID-19–associated GBS, the prototypic viral-triggered autoimmune disease, in the context of other emerging COVID-19–triggered autoimmunities, and discuss potential concerns with ongoing neuroimmunotherapies. Methods Eleven GBS cases in four key COVID-19 hotspots are discussed regarding presenting symptoms, response to therapies and cross-reactivity of COVID spike proteins with nerve glycolipids. Emerging cases of COVID-19–triggered autoimmune necrotizing myositis (NAM) and encephalopathies are also reviewed in the context of viral invasion, autoimmunity and ongoing immunotherapies. Results Collective data indicate that in this pandemic any patient presenting with an acute paralytic disease-like GBS, encephalomyelitis or myositis-even without systemic symptoms, may represent the first manifestation of COVID-19. Anosmia, ageusia, other cranial neuropathies and lymphocytopenia are red flags enhancing early diagnostic suspicion. In Miller-Fisher Syndrome, ganglioside antibodies against GD1b, instead of QG1b, were found; because the COVID-19 spike protein also binds to sialic acid-containing glycoproteins for cell-entry and anti-GD1b antibodies typically cause ataxic neuropathy, cross-reactivity between COVID-19–bearing gangliosides and peripheral nerve glycolipids was addressed. Elevated Creatine Kinase (>10,000) is reported in 10% of COVID-19–infected patients; two such patients presented with painful muscle weakness responding to IVIg indicating that COVID-19–triggered NAM is an overlooked entity. Cases of acute necrotizing brainstem encephalitis, cranial neuropathies with leptomeningeal enhancement, and tumefactive postgadolinium-enhanced demyelinating lesions are now emerging with the need to explore neuroinvasion and autoimmunity. Concerns for modifications-if any-of chronic immunotherapies with steroids, mycophenolate, azathioprine, IVIg, and anti-B-cell agents were addressed; the role of complement in innate immunity to viral responses and anti-complement therapeutics (i.e. eculizumab) were reviewed. Conclusions Emerging data indicate that COVID-19 can trigger not only GBS but other autoimmune neurological diseases necessitating vigilance for early diagnosis and therapy initiation. Although COVID-19 infection, like most other viruses, can potentially worsen patients with pre-existing autoimmunity, there is no evidence that patients with autoimmune neurological diseases stable on common immunotherapies are facing increased risks of infection. Glossary ACE-2=angiotensin-converting enzyme 2; AIDP=acute inflammatory demyelinating polyneuropathy; AMAN=acute motor axonal neuropathy; CK=creatine kinase; CRP=C-reactive protein; GBS=Guillain-Barré syndrome; ICU=intensive care unit; IVIg=intravenous immunoglobulin; MERS=Middle East respiratory syndrome; MFS=Miller Fisher syndrome; NAM=necrotizing autoimmune myositis Guillain-Barré syndromes (GBSs) comprise a spectrum of polyneuropathies characterized by acute (within 1–4 weeks) ascending motor weakness, mild or moderate sensory abnormalities, occasional cranial nerve involvement, and muscle or radicular pain. According to the degree of involvement of the motor or sensory nerves, myelin sheath, axon, or cranial nerve predominance, the most common subtypes are the acute inflammatory demyelinating polyneuropathy (AIDP), acute motor axonal neuropathy (AMAN), and the Miller Fisher syndrome (MFS) characterized by acute ophthalmoplegia, gait ataxia, and areflexia.1 GBS is one of the prototypic viral-triggered autoimmune neurologic diseases as approximately 70% of the patients have a preceding by 1–3 weeks, flu-like, viral illness.1,–,3 Among the infectious agents associated with triggering sporadic GBS are viruses, including influenza, enteroviruses, cytomegalovirus, Epstein–Barr virus, herpes simplex virus, hepatitis, or HIV, and bacteria, such as Campylobacter jejuni, Mycoplasma pneumoniae, and Haemophilus influenzae.1 GBS outbreaks have been also associated with viral epidemics or pandemics, including H1N1, swine flu A/New Jersey influenza strain, arthropod-borne flaviviruses, such as the West Nile virus, chikungunya, or Zika, and with coronaviruses, including the Middle East respiratory syndrome (MERS)-CoV and SARS-CoV.1,–,3 We are now more than 4 months into the peak of the COVID-19 pandemic with >5,000,000 infections and >330,000 deaths steadily increasingly worldwide, and although various respiratory and cardiac complications have been reported, we have not yet seen COVID-19–related neuroinflammatory or neuroautoimmune diseases as with the other viral outbreaks, including with coronaviruses MERS-CoV and SARS-CoV, which have 75–80% identical viral genome sequence with COVID-19.4 Whether this is due to COVID-19–inducing severe respiratory compromise soon after the median 4-day incubation period5 and underrecognition of neurologic events owing to overwhelming urgency to focus on life-saving efforts is unclear. In the most up-to-date large published series, apart from multifactorial acute cerebrovascular events in 5.7% of patients, the main COVID-19–related neurologic symptoms have been hypogeusia (in 5.6%), hyposmia (5.1%), and very high creatine kinase (CK) levels, with myalgia (in 19.3%) indicating potential CNS, peripheral nervous system, and myopathic manifestations.6 Things are however rapidly changing as just only the last 4 weeks the first COVID-19–triggered neurologic events are reported with at least 11 cases of GBS, the prototypic viral-triggered autoimmune neurologic disease, observed in the 4 main COVID-19 hotspots, Wuhan, Italy, Spain, and now France.7,–,11 The cases are of special neuroimmunologic and practical interest while highlight what is more to come. The very first case—and the only one from Wuhan—refers to a woman who 4 days after returning to Shanghai from Wuhan presented with acute lower extremity weakness and areflexia that progressed over 3 days to the arms without any systemic symptoms.7 When first seen, GBS was suspected and confirmed by elevated CSF protein and electromyographic features of demyelinating neuropathy. Her laboratory test results were normal, except of lymphocytopenia and thrombocytopenia. She was started on intravenous immunoglobulin (IVIg) but 4 days later developed fever, cough, and pneumonia and tested COVID-19 positive. After 3 weeks, her strength normalized and lymphocytopenia resolved. While at the regular neurology ward, however, 2 of her relatives taking care of her tested COVID-19 positive with pneumonia, while 2 of her neurologists and 6 nurses treating her GBS were put on isolation. Italy has just reported 6 patients with GBS,8 1 in this issue.9 All presented with subacute onset of upper and lower extremity weakness, distal paresthesias, and sensory deficits 3–10 days after experiencing cough, anosmia, ageusia, and sore throat. On admission, all had lymphocytopenia and high C-reactive protein (CRP) that led to diagnosis of COVID-19. One patient had facial diplegia and sensory ataxia.8 The CSF showed elevated protein concentration but was negative for COVID-19. Electrophysiology was consistent with demyelinating or axonal GBS. MRI showed enhancement of the caudal nerve roots or facial nerve. Symptoms rapidly progressed to tetraplegia requiring mechanical ventilation. Antiganglioside antibodies in 3/6 tested patients were negative. All received IVIg with variable recovery; 1 died. The third series refers to 2 men from Spain who, 3–5 days after experiencing low-grade fever, malaise, anosmia, and ageusia, developed MFS or polyneuritis cranialis.10 The patient with MFS presented with oculomotor nerve palsies, diplopia, perioral paresthesias, areflexia, ataxia, and elevated CSF protein concentration and the other with diplopia, bilateral abducens nerve palsy, and anosmia. Both had lymphopenia and tested positive for COVID-19; their SCF was COVID-19 negative. The patient with MFS was positive for GD1b ganglioside antibodies and improved with IVIg. In both, the neurologic features completely resolved, except for residual anosmia and ageusia. Last, 2 cases from France, a 43-year-old man and a 70-year-old woman, also presented with acute anosmia, followed by rapidly progressive weakness, paresthesias, ataxia, areflexia, and multiple cranial palsies (including III, V, VI, VII, and VIII), MRI enhancement of cranial nerves, roots, and plexus, high CSF protein concentration but negative for COVID-19, typical features of acute demyelinating neuropathy by electrophysiology, and clinical improvement after IVIg.11 GBS in the COVID-19 pandemic These early GBS cases, despite incomplete immunologic workup considering the enormous difficulties in highly stressed in-hospital settings, provide early clues on what to expect in the months ahead regarding the common acute autoimmune neurologic conditions, such as GBS, polyneuritis cranialis, encephalitis, encephalomyelitis, or myositis, which for years we have been casually referring to as postviral if seen after febrile illnesses. First and foremost, the practicing neurologists in this pandemic should now be aware that a patient who presents with an acute paralytic disease—like GBS, encephalomyelitis, or myositis—even without fever, dyspnea, or any systemic symptoms, may represent the first manifestation of COVID-19. This is compelling, considering that only 43% of COVID-19–positive patients on admission have fever,4,–,6 and many of the present patients with GBS did not have any COVID-19 symptoms at presentation. These early GBS cases also highlight that 2 clinical and laboratory signs, anosmia/ageusia and lymphocytopenia/thrombocytopenia, are red flags in suspecting COVID-19 in otherwise asymptomatic patients with acute neurologic events. They further confirm what we had feared from other viral pandemics that COVID-19 can trigger neurologic autoimmunity; in contrast to the other postviral neurologic diseases, however, COVID-19 requires high degree of suspicion as a potential hidden trigger to prevent inadvertent viral transmission to health care personnel and patient relatives, as in the Wuhan case.7 The series also highlights that GBS peaks 5–10 days after the first COVID-19 symptoms, which in intensive care unit (ICU) settings helps to distinguish GBS from critical illness neuropathy that usually appears later in the course of very sick ICU patients. Significance of anosmia/ageusia and other cranial nerve palsies The early manifestation of anosmia and ageusia not only in the present GBS series that often occurred in conjunction with other cranial neuropathies but also in large worldwide cohorts reporting sudden loss of smell and taste early in the infection in up to 60% of COVID-19 carriers5,6,12 is highly informative about COVID-19 neurovirulence or even possible viral entry into the brain. In contrast to commonly reversible anosmia when the non-neural olfactory epithelial cells are virally infected, the often persistent anosmia/ageusia after COVID-19 suggests neurotropism targeting olfactory neurons. SARS-CoV and MERS-CoV, the 2 coronaviruses similar to COVID-19, are neurovirulent and can enter the brain via olfactory nerves.13 In mice, after oronasal infection with SARS-CoV, the virus not only infects epithelial cells of the respiratory tract but also the olfactory receptor neurons in the neuroepithelium gaining access to the olfactory bulb and brainstem.13 These viruses can also enter the CNS via retrograde axonal transport through other cranial nerves, such as trigeminal, which possesses nociceptive neuronal receptors in the nasal cavity, the sensory fibers of the glossopharyngeal, and via peripheral nerves.13 The present GBS series, where oculomotor, trigeminal, and MRI-enhanced facial and nerves roots were concurrently affected, strengthens (but not prove) this notion. Accordingly, it will not be unexpected in the weeks and months ahead to see other COVID-19–infected patients with neurologic signs related to multiple cranial nerves, brainstem, and peripheral nerves with MRI enhancement in nerves and meninges. Autoimmunity of COVID-19–GBS: significance of sialic acids present in the coronaviruses and peripheral nerve myelin In 7/11 tested patients with COVID-19–GBS, the virus was not detected in the CSF, implying no direct root infection or intrathecal viral replication. The improvement of several patients with IVIg and the presence of GD1b antibodies in 1 tested patient suggest a postviral-triggered immune response similar to other postviral-induced GBS cases1,–,3 or other postviral autoimmune neurologic disorders.14 The reported GD1b ganglioside antibodies, however, although in contrast to GQ1b antibodies typically seen in MFS, are of very special interest. The SARS-CoV 3a protein contains oligosaccharides with direct evidence that sialic acids play a critical role in human coronavirus infection.15 It has been just shown that the attachment of coronaviruses to the surface of respiratory cells is mediated by the spike (S) viral protein, which binds not only to the angiotensin-converting enzyme 2 (ACE-2) receptor for entry16 but also to sialic acid–containing glycoproteins and gangliosides on cell surfaces.15 Such a dual receptor/attachment is proposed to be a reason for the increased transmissibility of COVID-19 compared with SARS-CoV that binds only to ACE-2 receptor.15,16 Of relevance to GBS is that various gangliosides, most commonly those containing either a disialosyl moiety, such as GD1b, GQ1b, and GT1b, or 2 gangliosides that share epitopes with GM2, or a combination of GM2 and GM1, GM1 and GD1b, can serve as antigens in patients with neuropathies.17 When IgM recognizes the Gal (pl-3) GalNAc moiety of GM1, which is found on the surface of motor neurons, there is clinically a motor neuropathy, but if recognizes epitopes containing disialosyl groups of GDlb, which is present on the dorsal root ganglionic neurons, there is sensory ataxic neuropathy.17 Immunization of rabbits with GDlb also causes sensory ataxic neuropathy mimicking the human disease.18 Of interest, the first described patient with sensory ataxic neuropathy and GDlb antibodies had also ophthalmoplegia,19 as seen in MFS and the present series.10 As COVID-19 spike interacts with the GalNAc residue of GM1 and ganglioside dimers for anchoring to cell surface gangliosides,15 cross-reactivity between epitopes within the COVID-19 spike-bearing gangliosides and signature sugar residues of surface peripheral nerve glycolipids is a very likely possibility. Such typical molecular mimicry has been shown between peripheral nerve glycolipids and Campylobacter jejuni or Zika virus that also trigger GBS.1,–,3 Accordingly, all GBS subtypes (AIDP, AMAN, and MFS) can be expected with COVID-19, necessitating screening for ganglioside antibodies to assess autoimmunity. An interesting therapeutic component in this association is the emerging data that chloroquine, an antimalarial drug under investigation for treating COVID-19, binds with high-affinity sialic acids and GM1 gangliosides and, in the presence of chloroquine, the SARS-CoV viral spike cannot bind gangliosides to infect the targeted cells.15 If benefit is confirmed and safety is established, chloroquine may be of added therapeutic value in future patients with COVID-19–triggered GBS in conjunction with IVIg. What is more to come with myositis in the offing Among the other potential COVID-19–associated autoimmune diseases, the first alarming concern is inflammatory myopathy, especially necrotizing autoimmune myositis (NAM) because very high CK levels >10,000 with myalgia and weakness are now reported in more than 10% of COVID-19–infected patients.6 Although COVID-19–associated myopathy has not yet been studied but only characterized as skeletal muscle injury or rhabdomyolysis,6 2 just published cases suggest an autoimmune COVID-19–triggered NAM. One, an 88-year-old man from New York presented with acute bilateral thigh weakness and inability to get up from the toilet, without fever or other systemic symptoms, and very high CK level (13,581 U/L).20 He was found COVID-19 positive and given hydroxychloroquine, and a week later, his painful weakness improved with CK reduction. The other, a 60-year-old man from Wuhan had a 6-day history of fever, cough, and COVID-19–positive pneumonia with normal strength and CK; 7 days later, although systemically had improved, his CRP doubled and developed painful muscle weakness with very high CK (11,842 U/L).21 He was given IVIg and his strength improved while became COVID-19 negative. Myopathic symptoms in a severe systemic viral disease are multifactorial, but an acute onset of severe muscle weakness with increased inflammatory markers and very high CK levels in the thousands, as described above, is consistent with autoimmune inflammatory myopathy within the spectrum of NAM, similar to what was first reported with HIV early in that epidemic.22,23 The most common causes of NAM are not chronic statin use as overstated, but autoimmune, paraneoplastic, or postviral.22,–,25 Considering that very high CK level and painful muscle weakness were seen in 10% of COVID-19–positive patients,6 a potentially treatable autoimmune myopathy has been likely overlooked. Studies with muscle biopsy and antibody screening are urgently needed in such patients because therapy with IVIg can improve strength, reduce morbidity, and facilitate recovery, as reported in the first 2 cases.20,21 COVID-19–associated myositis is also highly interesting because ACE-2, the SARS-CoV receptor, is reportedly expressed in skeletal muscle.26 If this is confirmed, COVID-19 may represent the first virus directly capable of infecting muscle fibers. None of the viruses implicated in viral-triggered myositis has so far been shown to infect muscle27,28; instead, viruses induce an immune T cell with clonal expansion of viral-specific T cells or macrophage-mediated, muscle fiber autoinvasion with abundant proinflammatory cytokines.22,29,30 Other emerging postinfectious autoimmune neurologic disorders Acute disseminated encephalomyelitis, as described for the other coronaviruses, or postinfectious brainstem encephalitis, myelitis, and radiculoneuropathies will not be unexpected. An atypical case of acute necrotizing encephalopathy, attributed to immune-mediated process and proinflammatory cytokines, and another with meningoencephalitis and leptomeningeal enhancement have been already noted.31 This picture is now becoming more clear with 2 reports in this issue of the Journal, documented by impressive MRIs; one, a case of acute necrotizing brainstem encephalopathy, presented with epilepsy and changes in the right mesial temporal lobe and hippocampus32 and another with altered mental status and multiple white matter tumefactive lesions with postgadolinium enhancement in periventricular areas and corpus callosum suggestive of demyelination.33 Not underestimating the overwhelming burden of acute COVID-19 to medical staff, vigilance for these disorders is needed along with screening for autoimmune encephalitis autoantibodies14 because these cases can potentially respond to early initiation of immunotherapy, especially with IVIg, whenever indicated, which may additionally offer various potentially protective antibodies and anticytokine effects. Residual neurologic deficits in COVID-19–recovered patients: need for a systematic study No neurologic data are yet available about the discharged patients who survived the catastrophic effects of the virus. We know that several people have permanently lost smell and taste, which is a form of disability affecting quality of life, depriving tasting pleasures, and the ability to detect danger signals, like smelling gas or fire. Many discharged patients require assistance because of muscle weakness and gait unsteadiness, which is arguably multifactorial; some patients may have had critical illness neuropathy and deconditioning with significant muscle atrophy worsened by comorbidities; others may have neurotoxicity or myocytotoxicity from antiviral therapies, like first described with antiretrovirals or chloroquine34,–,36; still others may have the residual effects from an unrecognized primary myopathy, neuropathy, or myelopathy due to postviral autoimmunity. A study exploring the patients' current causes of residual muscle weakness and sensory deficits is urgently needed using EMG, muscle or nerve biopsies, autoantibody screening, and CSF or imaging studies to determine immediate or long-term recovery prospects, identify potential reversibility, and accelerate return to normalcy. Patients with autoimmune neurologic diseases: how is COVID-19 changing ongoing immunotherapies and the role of complement Patients with autoimmune neuropathies, especially chronic inflammatory demyelinating polyneuropathy and multifocal motor neuropathy, but also with other autoimmunities like myasthenia gravis, MS, and inflammatory myopathies, have been justifiably concerned as to whether their disease status adds an additional risk placing them into an immunosuppressed or immunocompromised category. There is no current evidence that any of the aforementioned autoimmune disorder itself makes them more susceptible to COVID-19, but some immunosuppressive or even immunomodulating therapies they are receiving may have this potential, although there are no validated data. Most autoimmune neuromuscular patients are maintained on steroids, mycophenolate, or azathioprine while most chronic inflammatory demyelinating polyneuropathy receive monthly IVIg. The same applies to patients with MS where it seems safe to start or continue treatment with the standard disease-modifying drugs. If clinically stable and not lymphopenic, there are no compelling or data-driven reasons to change anything in these patients and disturb clinical stability. For patients on monthly IVIg, there may be even a theoretical advantage that IVIg offers additional protection due to natural autoantibodies; if IVIg is not infused as home infusion, switching to self-administered subcutaneous IgG might be an option to diminish exposure, as has been proven effective.37 For patients on rituximab, the infusion intervals can be prolonged to more than 6 months because both B-cell reduction and clinical benefit can persist longer.38 New emerging data provide credence and reassurance regarding these issues, especially on immunomodulating drugs. In a large number of patients from Wuhan, published in this issue of the Journal,39 it was shown that altered immunity induced by disease-modifying drugs in patients with MS or neuromyelitis optica spectrum disorder appears insufficient to enhance susceptibility to COVID-19 infection. The results are important but not unexpected considering that most of these therapies target the adaptive immune response with little, if any, effect on suppressing the innate immunity that facilitates infection of macrophages and viral spread. Similar data from New York City area show that the incidence of hospitalization among patients with immune-mediated inflammatory diseases on therapy with steroids and biologic agents was consistent with that among patients with COVID-19 in the general population, concluding that ongoing use of biologics is not associated with worse COVID-19 outcomes.40 There is also new evidence suggesting possible beneficial effect of anticomplement therapies.41 Complement is an integral component of the innate immune response to viruses and an instigator of proinflammatory responses with evidence that activation of C3 exacerbates SARS-CoV–associated acute respiratory distress syndrome and C3-C5 complement deposits are abundant in the lung biopsies from patients with COVID-19.41 It was proposed that complement inhibition may alleviate the inflammatory complications of COVID-19 infection leading to ongoing trials with anti-C3 and anti-C5 agents.41,42 On this basis, eculizumab, an anti-C5 monoclonal antibody approved for neuromyelitis optica spectrum disorder and myasthenia gravis with some benefits in patients with GBS, may not be withheld, if indicated, as, like IVIg, may theoretically have added benefit. Study funding No targeted funding reported. Disclosure M. Dalakas is an associate editor for Neurology: Neuroimmunology & Neuroinflammation. Disclosures available: Neurology.org/NN. Footnotes Go to Neurology.org/NN for full disclosures. Funding information is provided at the end of the article. The Article Processing Charge was funded by the author. Received May 1, 2020. Accepted in final form May 4, 2020. Copyright © 2020 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology. This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. References 1.↵Dalakas MC. Pathogenesis of immune-mediated neuropathies Biochimica et. 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Neurological impact of COVID-19 is still unknown.
george sperco's curator insight, February 7, 2023 9:50 AM
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Josep Dalmau receives the “Scientific Breakthrough 2023” Award from the American Brain Foundation

From www.clinicbarcelona.org - May 23, 2023 2:38 PM
The accolade recognises the commitment of this Clínic Barcelona-IDIBAPS researcher to deepening our understanding of autoimmune neurological diseases such...
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IDIBAPS creates three multidisciplinary research programs to encourage collaboration among its groups

From www.clinicbarcelona.org - September 5, 2023 11:21 AM
They are the Translational cancer research program, the Synaptic autoimmunity in neurology, psychiatry and cognitive neuroscience program and the Lymphoid...
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ExTINGUISH: A Beacon of Hope for NMDAR Encephalitis

From youtu.be - August 6, 2023 7:10 PM
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MR Imaging Findings in a Large Population of Autoimmune Encephalitis | American Journal of Neuroradiology

MR Imaging Findings in a Large Population of Autoimmune Encephalitis | American Journal of Neuroradiology | AntiNMDA | Scoop.it
From www.ajnr.org - July 27, 2023 11:18 AM
Research ArticleAdult Brain MR Imaging Findings in a Large Population of Autoimmune Encephalitis S. Gillon, M. Chan, J. Chen, E.L. Guterman, X. Wu, C.M. Glastonbury and Y. Li American Journal of Neuroradiology July 2023, 44 (7) 799-806; DOI: https://doi.org/10.3174/ajnr.A7907 ArticleFigures & DataInfo & MetricsReferences PDF This article requires a subscription to view the full text. If you have a subscription you may use the login form below to view the article. Access to this article can also be purchased. AbstractBACKGROUND AND PURPOSE: Autoimmune encephalitis is a rare condition in which autoantibodies attack neuronal tissue, causing neuropsychiatric disturbances. This study sought to evaluate MR imaging findings associated with subtypes and categories of autoimmune encephalitis.MATERIALS AND METHODS: Cases of autoimmune encephalitis with specific autoantibodies were identified from the medical record (2009–2019). Cases were excluded if no MR imaging of the brain was available, antibodies were associated with demyelinating disease, or >1 concurrent antibody was present. Demographics, CSF profile, antibody subtype and group (group 1 intracellular antigen or group 2 extracellular antigen), and MR imaging features at symptom onset were reviewed. Imaging and clinical features were compared across antibody groups using χ2 and Wilcoxon rank-sum tests.RESULTS: Eighty-five cases of autoimmune encephalitis constituting 16 distinct antibodies were reviewed. The most common antibodies were anti-N-methyl-D-aspartate (n = 41), anti-glutamic acid decarboxylase (n = 7), and anti-voltage-gated potassium channel (n = 6). Eighteen of 85 (21%) were group 1; and 67/85 (79%) were group 2. The median time between MR imaging and antibody diagnosis was 14 days (interquartile range, 4–26 days). MR imaging had normal findings in 33/85 (39%), and 20/33 (61%) patients with normal MRIs had anti-N-methyl-D-aspartate receptor antibodies. Signal abnormality was most common in the limbic system (28/85, 33%); 1/68 (1.5%) had susceptibility artifacts. Brainstem and cerebellar involvement were more common in group 1, while leptomeningeal enhancement was more common in group 2.CONCLUSIONS: Sixty-one percent of patients with autoimmune encephalitis had abnormal brain MR imaging findings at symptom onset, most commonly involving the limbic system. Susceptibility artifact is rare and makes autoimmune encephalitis less likely as a diagnosis. Brainstem and cerebellar involvement were more common in group 1, while leptomeningeal enhancement was more common in group 2.ABBREVIATIONS:AIEautoimmune encephalitisanti-Gq1banti-ganglioside Q1banti-LGI1anti-leucine-rich glioma inactivated 1CASPR2contactin-associated protein-like 2GABAgamma-aminobutyric acidGADglutamic acid decarboxylaseGFAPglial fibrillary acidic proteinNMDAN-methyl-D-aspartatePD-1programmed cell death protein 1VGCCvoltage gated calcium channelVGKCvoltage-gated potassium channel© 2023 by American Journal of NeuroradiologyView Full Text Log in using your username and password Username * Password * Forgot your user name or password? PreviousNext Back to top In this issue American Journal of Neuroradiology Vol. 44, Issue 7 1 Jul 2023 Table of ContentsIndex by authorComplete Issue (PDF) Print Download PDF Email Article Citation Tools Share Tweet WidgetFacebook LikeGoogle Plus One Purchase Related ArticlesNo related articles found.PubMedGoogle Scholar Cited By...No citing articles found.CrossrefGoogle Scholar More in this TOC Section Cost-Effectiveness Analysis of 68Ga-DOTATATE PET/MRI in Radiotherapy Planning in Patients with Intermediate-Risk Meningioma Choroid Plexus Calcification Correlates with Cortical Microglial Activation in Humans: A Multimodal PET, CT, MRI Study Show more ADULT BRAIN Similar Articles
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Elevated blood and cerebrospinal fluid biomarkers of microglial activation and blood‒brain barrier disruption in anti-NMDA receptor encephalitis | Journal of Neuroinflammation | Full Text

Elevated blood and cerebrospinal fluid biomarkers of microglial activation and blood‒brain barrier disruption in anti-NMDA receptor encephalitis | Journal of Neuroinflammation | Full Text | AntiNMDA | Scoop.it
From jneuroinflammation.biomedcentral.com - July 27, 2023 11:01 AM
Background Anti-NMDA receptor (NMDAR) encephalitis is an autoimmune disease characterized by complex neuropsychiatric syndrome and cerebrospinal fluid (CSF) NMDAR antibodies. Triggering receptor expressed on myeloid cells 2 (TREM2) has been reported to be associated with inflammation of the...
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Anti-N-methyl-d-aspartate receptor encephalitis and positive human herpesvirus-7 deoxyribonucleic acid in cerebrospinal fluid: a case report | Journal of Medical Case Reports | Full Text

Anti-N-methyl-d-aspartate receptor encephalitis and positive human herpesvirus-7 deoxyribonucleic acid in cerebrospinal fluid: a case report | Journal of Medical Case Reports | Full Text | AntiNMDA | Scoop.it
From jmedicalcasereports.biomedcentral.com - July 14, 2023 2:17 PM
Background Anti-N-methyl-d-aspartate receptor encephalitis is a neuroautoimmune syndrome typically presenting with seizures, psychiatric symptoms, and autonomic dysfunction. Human herpesvirus-7 is often found with human herpesvirus-6 and infects leukocytes such as T-cells, monocytes–macrophages,...
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We have a winner! - The Anti-NMDA Receptor Encephalitis Foundation Prize, 2023

We have a winner! - The Anti-NMDA Receptor Encephalitis Foundation Prize, 2023 | AntiNMDA | Scoop.it
From www.antinmdafoundation.org - June 25, 2023 2:58 PM
It’s that time of year again, when the Foundation is delighted to offer its annual Anti-NMDA Receptor Encephalitis Foundation Prize to a promising neurology trainee ...Read More...
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Antibodies Associated With Autoimmune Encephalitis in Patients With Presumed Neurodegenerative Dementia | Neurology Neuroimmunology & Neuroinflammation

Antibodies Associated With Autoimmune Encephalitis in Patients With Presumed Neurodegenerative Dementia | Neurology Neuroimmunology & Neuroinflammation | AntiNMDA | Scoop.it
From nn.neurology.org - June 19, 2023 9:45 PM
AbstractBackground & Objectives Autoimmune encephalitis (AIE) may present with prominent cognitive disturbances without overt inflammatory changes in MRI and CSF. Identification of these neurodegenerative dementia diagnosis mimics is important because patients generally respond to immunotherapy. The objective of this study was to determine the frequency of neuronal antibodies in patients with presumed neurodegenerative dementia and describe the clinical characteristics of the patients with neuronal antibodies.Methods In this retrospective cohort study, 920 patients were included with neurodegenerative dementia diagnosis from established cohorts at 2 large Dutch academic memory clinics. In total, 1,398 samples were tested (both CSF and serum in 478 patients) using immunohistochemistry (IHC), cell-based assays (CBA), and live hippocampal cell cultures (LN). To ascertain specificity and prevent false positive results, samples had to test positive by at least 2 different research techniques. Clinical data were retrieved from patient files.Results Neuronal antibodies were detected in 7 patients (0.8%), including anti-IgLON5 (n = 3), anti-LGI1 (n = 2), anti-DPPX, and anti-NMDAR. Clinical symptoms atypical for neurodegenerative diseases were identified in all 7 and included subacute deterioration (n = 3), myoclonus (n = 2), a history of autoimmune disease (n = 2), a fluctuating disease course (n = 1), and epileptic seizures (n = 1). In this cohort, no patients with antibodies fulfilled the criteria for rapidly progressive dementia (RPD), yet a subacute deterioration was reported in 3 patients later in the disease course. Brain MRI of none of the patients demonstrated abnormalities suggestive for AIE. CSF pleocytosis was found in 1 patient, considered as an atypical sign for neurodegenerative diseases. Compared with patients without neuronal antibodies (4 per antibody-positive patient), atypical clinical signs for neurodegenerative diseases were seen more frequently among the patients with antibodies (100% vs 21%, p = 0.0003), especially a subacute deterioration or fluctuating course (57% vs 7%, p = 0.009).Discussion A small, but clinically relevant proportion of patients suspected to have neurodegenerative dementias have neuronal antibodies indicative of AIE and might benefit from immunotherapy. In patients with atypical signs for neurodegenerative diseases, clinicians should consider neuronal antibody testing. Physicians should keep in mind the clinical phenotype and confirmation of positive test results to avoid false positive results and administration of potential harmful therapy for the wrong indication.GlossaryAD=Alzheimer dementia; AIE=autoimmune encephalitis; CBA=cell-based assays; DLB=dementia with Lewy bodies; IHC=immunohistochemistry; LN=live hippocampal cell cultures; PPA=primary progressive aphasia; PSP=progressive supranuclear palsy; RPD=rapidly progressive dementia; VGCC=voltage-gated calcium channelCognitive dysfunction can be the presenting and most prominent symptom in patients with autoimmune encephalitis (AIE).1,2 In contrast to neurodegenerative diseases, patients with antibody-mediated encephalitis might benefit from immunotherapy and improve considerably.3,4 The presence of neuronal antibodies has been reported predominantly in rapidly progressive dementia (RPD).5,6 However, AIE can present less fulminantly and is therefore potentially missed, resulting in diagnosis and treatment delay or even misdiagnosis.7,8 We hypothesized that a small—but not insignificant—part of dementia syndromes is indeed caused by antibody-mediated encephalitis and underdiagnosed, withholding these patients' available treatments. The wish to diagnose every single patient with autoimmune encephalitis is in opposition with the risk for false positive tests.9 Therefore, we strictly adhere to confirmation of positive test results with 2 different test techniques. In this study, we describe the frequency of neuronal antibodies in a cohort of patients diagnosed with various dementia syndromes in a memory clinic. In addition, we present clues to improve clinical recognition of AIE in dementia syndromes.MethodsPatients and Laboratory StudiesIn this retrospective multicenter study, we tested for the presence of neuronal antibodies in serum and CSF samples from patients diagnosed with neurodegenerative dementia diagnosis, included earlier prospectively in established cohorts at 2 large Dutch academic memory clinics (Erasmus University Medical Center, Amsterdam University Medical Centers, location VUmc)10 between 1998 and 2016 (84% last 10 years). All patients fulfilled the core clinical criteria for dementia, as defined by the National Institutes of Aging-Alzheimer Association workgroups.11 Patients were classified into 4 subgroups (based on diagnostic criteria): Alzheimer dementia (AD), frontotemporal dementia (FTD; both behavioral variant and primary progressive aphasia [PPA]), dementia with Lewy bodies (DLB), and other dementia syndromes.11,-,14 Rapidly progressive dementia was defined as dementia within 12 months or death within 2 years after the appearance of the first cognitive symptoms.15 Patients with vascular dementia were not included. Clinic information was retrieved from the prospectively collected data. A subacute deterioration was defined as a marked progression of symptoms in 3 months and a fluctuating course as a disease course fluctuating over a longer period (e.g., weeks to months; different from the fluctuations within a day as seen in some patients with DLB). Dementia markers were scored according to the reference values (per year and per center; included in Table 1).View inline View popup Table 1 Patient Characteristics of Auto-antibody Positive PatientsAll samples, stored in both cohorts' biobanks, were screened for immunoreactivity with immunohistochemistry (IHC), as previously described.16 Preferably, paired serum and CSF were tested for optimal sensitivity and specificity. Samples that were showing a positive or questionable staining pattern were tested more extensively using validated commercial cell-based assays (CBA) and in-house CBA (eTable 1, links.lww.com/NXI/A869). In addition, these samples were tested with live hippocampal cell cultures (LN).16,17 To ascertain specificity, only samples that could be confirmed by CBA or LN were scored as positive because there is a higher risk for false-positive test results in this population with a low a priori chance to have encephalitis.9,18 If IHC was suggestive for antibodies against intracellular (paraneoplastic) targets, this was explored by a different IHC technique.19 Anti-thyroid peroxidase (TPO), voltage-gated calcium channel (VGCC), or low titer glutamic acid decarboxylase antibodies were not tested for because these are generally nonspecific at these ages and are not associated with dementia syndromes.Antibody-positive patients were described exploratory and compared with a randomly selected antibody-negative group (ratio 1:4) matched for memory clinic, dementia subtype, sex, and age (±5 years). For these comparisons, medical records were additionally assessed for both the antibody-positive and antibody-negative patients. All antibody-positive patients were reviewed by a panel consisting of neurologists specialized in neurodegenerative (F.J., H.S., J.S.) or autoimmune diseases (J.V., P.S.S., M.T.), and a consensus classification of AIE vs AIE with a neurodegenerative dementia comorbidity was reached.Statistical AnalysisWe used IBM SPSS 25.0 (SPSS Inc) and Prism 8.4.3 (GraphPad) for statistical analysis. Baseline characteristics were analyzed using the Fisher exact test, the Fisher-Freeman-Halton test, or the Kruskal-Wallis test, when appropriate. For group comparisons, encompassing categorical data, we used the Pearson χ2 test or the Fisher-Freeman-Halton test, when appropriate. Continuous data were analyzed using the Mann-Whitney U test. All p-values were two-sided and considered statistically significant when below 0.05. We applied no correction for multiple testing, and therefore, p values between 0.05 and 0.005 should be interpreted carefully.Standard Protocol Approvals, Registrations, and Patient ConsentsThe study was approved by The Institutional Review Boards of Erasmus University Medical Center Rotterdam and Amsterdam University Medical Center, location VUmc. Written informed consent was obtained from all patients.Data AvailabilityAny data not published within this article are available at the Erasmus MC University Medical Center. Patient-related data will be shared on reasonable request from any qualified investigator, maintaining anonymization of the individual patients.ResultsIn total, 1,398 samples from 920 patients were tested (Figure; in 478, both CSF and serum [52%]). Three-hundred fifty-eight patients were classified as AD (39%), 283 FTD (31%), and 161 DLB (17%). The fourth subgroup with other dementia syndromes consisted of 118 patients (13%), including progressive supranuclear palsy (n = 48, 5%) and corticobasal syndrome (n = 29, 3%). The median age at disease onset was 62 years (range 16–90 years). Male patients were overrepresented (n = 542, 59%), and 60 patients (7%) fulfilled the criteria for rapidly progressive dementia (RPD; eTable 2, links.lww.com/NXI/A869).<img class="highwire-fragment fragment-image" alt="Figure" width="440" height="305" src="https://nn.neurology.org/content/nnn/10/5/e200137/F1.medium.gif">Download figure Open in new tab Download powerpoint Figure Flowchart of Patient Inclusion With Antibody ResultsIn total, 920 patients (1,398 samples) with a presumed neurodegenerative dementia syndrome were tested for the presence of neuronal antibodies in serum and CSF. Neuronal antibodies were detected in 7 patients (0.8%, 95% CI 0.2–1.3); five among the 358 Alzheimer disease patients. Subclassification of the ‘other’ group is provided in supplementary table eTable 2 (links.lww.com/NXI/A869). AD = Alzheimer disease; DLB = diffuse Lewy body dementia; DPPX = dipeptidyl aminopeptidase-like protein 6; FTD = frontotemporal dementia; IgLON5 = Ig-like domain-containing protein family member 5; LGI1 = leucin-rich glioma inactivated protein 1; NMDAR = N-methyl-d-aspartate receptor; S = serum.Neuronal antibodies were detected in 7 patients (0.8%; 5 in the AD group: 1.4%; Figure), including anti-IgLON5 (n = 3), anti-LGI1 (n = 2), anti-DPPX (n = 1), and anti-NMDAR antibodies (n = 1; Table 1). Among these 7, 4 patients were diagnosed retrospectively with an exclusive diagnosis of AIE, while 3 patients were classified to have AIE (anti-IgLON5 [n = 2] and anti-NMDAR antibodies [n = 1]) with a neurodegenerative dementia comorbidity. No patients with antibodies fulfilled the criteria for RPD, yet a subacute deterioration later in the disease was reported in 3 patients. Atypical clinical signs for neurodegenerative diseases were present in 7 of 7 antibody-positive patients (100% vs 21% in antibody-negative patients, p = 0.0003; Table 2). These included a subacute deterioration (n = 3), myoclonus (n = 2), a fluctuating disease course over months (n = 1), a history of autoimmune disease (n = 2), and epileptic seizures (n = 1; Table 1). Brain MRI of none of the patients demonstrated abnormalities suggestive for active AIE, in particular no hippocampal swelling nor increased T2-signal intensity. CSF pleocytosis was found in 1 patient. CSF biomarkers (t-tau, p-tau, and Aβ42) were tested in 5 of 7 patients, and t-tau and p-tau were increased in 4, while a low Aβ42 was seen in 2. Of note, only 1 patient had the combination of reduced Aβ42 and increased p-tau/t-tau, and was diagnosed with a comorbid AD. No patient received immunotherapy. Two patients still alive (1 anti-LG1, 1 anti-DPPX positive) were contacted but refused to visit our clinic to try very delayed immunotherapy trials. It is of interest that the patient with anti-DPPX antibodies showed spontaneous improvement of cognitive disturbances, atypical for a pure neurodegenerative disease.View inline View popup Table 2 Comparisons Between Patients With Neuronal Auto-antibodies and Antibody-Negative PatientsCompared with the patients without neuronal antibodies, subacute cognitive deterioration or fluctuating course was present more frequently (4/7 [57%] vs 2/28 [7%], p = 0.009). Although movement disorders (myoclonus) and autoimmune disorders were present in 2 of 7 patients each, this did not reach significance (Table 2).DiscussionIn this large, multicenter, cohort study consisting of patients with a presumed neurodegenerative dementia diagnosis, we show that a small, but clinically relevant proportion (0.8%) have neuronal antibodies. In this particular group, 4 of 7 antibody-positive patients presented with an atypical clinical course (subacute deterioration or fluctuating disease course), which is considered as a clinical clue (‘red flag’) for an antibody-mediated etiology of dementia.4 It is important that a fluctuating disease course was observed over a longer period (e.g., weeks or months) in AIE and should not be confused with shorter fluctuations of cognition or alertness (over the day) in DLB. Other known red flags, which we observed in these 7 patients, were myoclonus, epilepsy, pleocytosis, or a history of autoimmune disorders, as described earlier.1,4,-,6 Compared with antibody-negative patients, no significant difference was found related to these symptoms alone, probably due to the low number of positive patients and related low power. However, atypical clinical signs for neurodegenerative diseases together were seen significantly more frequently in the antibody-positive group. Within this cohort mostly devoid of patients with RPD, none of the antibody-positive patients fulfilled the criteria for RPD, nor ancillary testing showed specific signs for AIE in most patients. This implicates that AIE can resemble more protracted, progressive neurodegenerative dementia syndromes, as we reported earlier.1Three antibody-positive patients had IgLON5 antibodies, which is a very rare and known to have heterogeneous (chronic) clinical manifestations, including pronounced sleep problems, cognitive dysfunction, and movement disorders.20,21 Misdiagnosis with progressive supranuclear palsy (PSP) is reported, mainly associated with the preceding movement disorders. In addition, half of the patients have cognitive impairment of whom 20% fulfilled clinical criteria for dementia.21 It is of interest that IgLON5 disease shares features with neurodegeneration because autopsy studies showed tau deposits.22 However, there is a strong HLA association,20 and studies show that antibodies directly bind to surface IgLON5 on neurons and directly alter neuronal function and structure,23 suggesting a primary inflammatory disease.In previous research, a notably higher frequency (14%) of neuronal antibodies in patients with dementia was reported by Giannocaro et al.24 The discrepancy with our test results is probably explained by differences in patient selection and antibody testing methodology. First, 30% of the patients in the cohort described by Giannocaro et al. demonstrated CSF inflammatory abnormalities, indicating a relatively high pretest probability of antibody-positivity compared with our study.24 A lack of CSF pleocytosis probably better represents the population of memory clinics. Second, the previous study exclusively tested serum by cell-based assay without confirmatory tests nor testing antibodies in CSF.24 We only considered antibody test results positive when confirmed by additional techniques to avoid suboptimal specificity and false-positive test results.9Previous studies, including our own, suggested RPD as a relevant red flag for AIE,1,4,9,25 but we cannot determine this from our study based on the design of our study. We included patients at tertiary memory clinics without overt signs or symptoms suggestive for encephalitis. Therefore, the amount of patients with RPD included was very limited (7%), comparable with other large dementia cohort studies, as was the amount of patients with abnormal ancillary testing suggestive for AIE because this would have prompted a different approach than referral to a tertiary memory clinic. These patients with RPD and ancillary testing suggestive of AIE were not included in our study. Inclusion of those patients would have likely increased our rate of positivity.The strength of our study is the large number of paired samples (serum and CSF combined) from a cohort with various presumed neurodegenerative diseases without AIE suspicion, representative for academic memory clinics. A limitation is the lack of neuropathologic data to support our findings and make diagnoses of neurodegeneration or inflammation definite. To confirm if the symptoms are related to the presence of antibodies, we tried to overcome this concern in different ways. First, the presence of antibodies in serum and CSF was confirmed by different techniques (cell-based assay, tissue immunohistochemistry, and cultured live neurons), indicating optimal test specificity. Second, afterward patients were thoroughly reviewed by a panel of neurologists specialized in neurodegenerative or autoimmune disease to detect atypical signs and symptoms related to AIE. This is a very large cohort of patients with dementia examined for the presence of neuronal antibodies. Nevertheless, an important limitation of this study is the small number of antibody-positive patients, underpowering the probability to identify significant differences between antibody-positive and antibody-negative patients. The low number of patients with RPD has probably added to this small number, and a prospective study including patients with RPD is recommended. Nevertheless, several probable red flags could be identified. Diagnosing AIE in patients with dementia is highly relevant because these patients might respond to immunotherapy. Therefore, clinicians should test for neuronal antibody in patients demonstrating red flags suggestive for an autoimmune etiology, if possible early in disease course. When profound temporal lobe atrophy already has developed, little effect is to be expected. Red flags identified in this study are subacute deterioration or fluctuating course. Other red flags described previously, we also see reflected in our study, are autoimmune disorders, myoclonus, seizures, and pleocytosis,1,4,-,6 Preferably, both serum and CSF should be tested and confirmed by additional techniques. Always consider the possibility of a false positive test result, especially when only using a single technique (like the commercial cell-based assay). If the clinical phenotype is atypical, confirmation in a research laboratory should be mandatory. The use of antibody panels is discouraged, especially including the paraneoplastic blots, because these are associated with higher risks of lack of clinical relevance.26 This caution is even more warranted for tests not associated with neurodegenerative syndromes, but with a history of nonspecificity, including VGKC (in the absence of LGI1 or CASPR2), VGCC, anti-TPO, and low-titer anti-GAD65.27,-,30 Further research should focus on improving clinical recognition of AIE in patients with dementia determining the effect of immunotherapy in this specific patient category and assessing the frequency of AIE in RPD.In conclusion, we have shown that a clinically relevant, albeit small proportion of patients with a suspected neurodegenerative disease and nonrapidly progressive course have neuronal antibodies indicative of AIE.Study FundingM.J. Titulaer was supported by an Erasmus MC fellowship and has received funding from the Netherlands Organization for Scientific Research (NWO, Veni incentive), ZonMw (Memorabel program), the Dutch Epilepsy Foundation (NEF 14-19 & 19-08), Dioraphte (2001 0403), and E-RARE JTC 2018 (UltraAIE, 90030376505). F. Leypoldt has received funding from the German Ministry of Education and Research (01GM1908A) and the Era-Net funding program (LE3064/2-1).DisclosureA.E.M. Bastiaansen reports no disclosures. R.W. van Steenhoven reports no disclosures. Research programs of Wiesje van der Flier have been funded by ZonMW, now, EUFP7, EU-JPND, Alzheimer Nederland, Hersenstichting CardioVascular Onderzoek Nederland, Health∼Holland, Topsector Life Sciences & Health, stichting Dioraphte, Gieskes-Strijbis fonds, stichting Equilibrio, Edwin Bouw fonds, Pasman stichting, stichting Alzheimer & Neuropsychiatrie Foundation, Philips, Biogen MA Inc, Novartis-NL, Life-MI, AVID, Roche BV, Fujifilm, and Combinostics. W.M. van der Flier holds the Pasman chair. W.M. van der Flier is recipient of ABOARD, which is a public-private partnership receiving funding from ZonMW (#73305095007) and Health Holland, Topsector Life Sciences & Health (PPP-allowance; #LSHM20106). All funding is paid to her institution. WF has performed contract research for Biogen MA Inc and Boehringer Ingelheim. All funding is paid to her institution. W.M. van der Flier has been an invited speaker at Boehringer Ingelheim, Biogen MA Inc, Danone, Eisai, WebMD Neurology (Medscape), and Springer Healthcare. All funding is paid to her institution. W.M. van der Flier is consultant to Oxford Health Policy Forum CIC, Roche, and Biogen MA Inc. All funding is paid to her institution. W.M. van der Flier participated in advisory boards of Biogen MA Inc and Roche. All funding is paid to her institution. W.M. van der Flier is a member of the steering committee of PAVE and Think Brain Health. W.M. van der Flier was an associate editor of Alzheimer, Research & Therapy in 2020/2021. W.M. van der Flier is an associate editor at Brain. Research of C. Teunissen was supported by the European Commission (Marie Curie International Training Network, Grant Agreement No. 860197 (MIRIADE)), Innovative Medicines Initiatives 3TR (Horizon 2020, Grant No. 831434), EPND (IMI 2 Joint Undertaking (JU) under Grant Agreement No. 101034344) and JPND (bPRIDE), National MS Society (Progressive MS alliance) and Health Holland, the Dutch Research Council (ZonMW), Alzheimer Drug Discovery Foundation, The Selfridges Group Foundation, Alzheimer Netherlands, and Alzheimer Association. C. Teunissen is recipient of ABOARD, which is a public-private partnership receiving funding from ZonMW (#73305095007) and Health∼Holland, Topsector Life Sciences & Health (PPP-allowance, #LSHM20106). ABOARD also receives funding from Edwin Bouw Fonds and Gieskes-Strijbisfonds. C. Teunissen has a collaboration contract with ADx Neurosciences, Quanterix, and Eli Lilly, performed contract research or received grants from AC-Immune, Axon Neurosciences, Bioconnect, Bioorchestra, Brainstorm Therapeutics, Celgene, EIP Pharma, Eisai, Grifols, Novo Nordisk, PeopleBio, Roche, Toyama, and Vivoryon. She serves on editorial boards of Medidact Neurologie/Springer, Alzheimer Research and Therapy, and Neurology: Neuroimmunology & Neuroinflammation and is an editor of a Neuromethods book Springer. She had speaker contracts for Roche, Grifols, and Novo Nordisk. E. de Graaff holds a patent for the detection of anti-DNER antibodies. M.M.P. Nagtzaam reports no disclosures. M. Paunovic reports no disclosures. S. Franken reports no disclosures. M.W.J. Schreurs reports no disclosures. F. Leypoldt has received speakers honoraria from Grifols, Roche, Novartis, Alexion, and Biogen and serves on an advisory board for Roche and Biogen. He works for an academic institution (University Hospital Schleswig-Holstein) which offers commercial autoantibody testing. P.A.E. Sillevis Smitt holds a patent for the detection of anti-DNER and received research support from Euroimmun. J.M. de Vries reports no disclosures. H. Seelaar reports no disclosures. J.C. van Swieten reports no disclosures. F.J. de Jong reports no disclosures. Y.A.L. Pijnenburg Research of Alzheimer center Amsterdam is part of the neurodegeneration research program of Amsterdam Neuroscience. Alzheimer Center Amsterdam is supported by Stichting Alzheimer Nederland and Stichting VUmc fonds. The chair of Wiesje van der Flier is supported by the Pasman stichting. M.J. Titulaer has filed a patent, on behalf of the Erasmus MC, for methods for typing neurologic disorders and cancer, and devices for use therein, and has received research funds for serving on a scientific advisory board of Horizon Therapeutics, for consultation at Guidepoint Global LLC, for consultation at UCB, for teaching colleagues by Novartis. MT has received an unrestricted research grant from Euroimmun AG and from CSL Behring. Go to Neurology.org/NN for full disclosure.AcknowledgmentThe authors thank all patients for their participation. The authors also thank Esther Hulsenboom and Ashraf Jozefzoon-Aghai for their technical assistance. M.W.J. Schreurs, F. Leypoldt, P.A.E. Sillevis Smitt, J.M. de Vries, and M.J. Titulaer of this publication are members of the European Reference Network for Rare Immunodeficiency, Autoinflammatory, and Autoimmune Diseases—Project ID No. 739543 (ERN-RITA; HCP Erasmus MC and University Hospital Schleswig-Holstein). H. Seelaar, J.C. van Swieten, and F.J. de Jong of this publication are members of the European Reference Network for Rare Neurological Diseases—Project ID 73910. Research of the VUmc Alzheimer center is part of the neurodegeneration research program of Amsterdam Neuroscience. The Alzheimer Center VUmc is supported by Alzheimer Nederland and Stichting VUmc Fonds. The clinical database structure was developed with funding from Stichting Dioraphte.Appendix Authors<img class="highwire-fragment fragment-image" alt="Table" src="https://nn.neurology.org/content/nnn/10/5/e200137/T3.medium.gif"; width="599" height="2531">FootnotesGo to Neurology.org/NN for full disclosures. Funding information is provided at the end of the article.The Article Processing Charge was funded the authors.Submitted and externally peer reviewed. The handling editor was Editor Josep O. Dalmau, MD, PhD, FAAN.Received December 8, 2022.Accepted in final form May 8, 2023.Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.References1.↵Bastiaansen AEM, van Steenhoven RW, de Bruijn M, et al. Autoimmune encephalitis resembling dementia syndromes. Neurol Neuroimmunol Neuroinflamm. 2021;8(5):e1039.OpenUrlAbstract/FREE Full Text2.↵Lancaster E, Lai M, Peng X, et al. Antibodies to the GABA(B) receptor in limbic encephalitis with seizures: case series and characterisation of the antigen. Lancet Neurol. 2010;9(1):67-76.OpenUrlCrossRefPubMed3.↵Titulaer MJ, McCracken L, Gabilondo I, et al. Treatment and prognostic factors for long-term outcome in patients with anti-NMDA receptor encephalitis: an observational cohort study. Lancet Neurol 2013;12(2):157-165.OpenUrlCrossRefPubMed4.↵Flanagan EP, McKeon A, Lennon VA, et al. Autoimmune dementia: clinical course and predictors of immunotherapy response. Mayo Clin Proc. 2010;85(10):881-897.OpenUrlCrossRefPubMed5.↵Geschwind MD, Tan KM, Lennon VA, et al. Voltage-gated potassium channel autoimmunity mimicking creutzfeldt-jakob disease. Arch Neurol. 2008;65(10):1341-1346.OpenUrlCrossRefPubMed6.↵Grau-Rivera O, Sanchez-Valle R, Saiz A, et al. Determination of neuronal antibodies in suspected and definite Creutzfeldt-Jakob disease. JAMA Neurol. 2014;71(1):74-78.OpenUrl7.↵Titulaer MJ, McCracken L, Gabilondo I, et al. Late-onset anti-NMDA receptor encephalitis. Neurology. 2013;81(12):1058-1063.OpenUrlAbstract/FREE Full Text8.↵Gaig C, Graus F, Compta Y, et al. Clinical manifestations of the anti-IgLON5 disease. Neurology. 2017;88(18):1736-1743.OpenUrlAbstract/FREE Full Text9.↵Bastiaansen AEM, de Bruijn M, Schuller SL, et al. Anti-NMDAR encephalitis in The Netherlands, focusing on late-onset patients and antibody test accuracy. Neurol Neuroimmunol Neuroinflamm. 2022;9(2):e1127.OpenUrl10.↵van der Flier WM, Scheltens P. Amsterdam dementia cohort: performing research to optimize care. J Alzheimers Dis. 2018;62(3):1091-1111.OpenUrl11.↵McKhann GM, Knopman DS, Chertkow H, et al. The diagnosis of dementia due to Alzheimer's disease: recommendations from the National Institute on Aging-Alzheimer's Association workgroups on diagnostic guidelines for Alzheimer's disease. Alzheimers Dement. 2011;7(3):263-269.OpenUrlCrossRefPubMed12.↵Rascovsky K, Hodges JR, Knopman D, et al. Sensitivity of revised diagnostic criteria for the behavioural variant of frontotemporal dementia. Brain. 2011;134(Pt 9):2456-2477.OpenUrlCrossRefPubMed13.↵Gorno-Tempini ML, Hillis AE, Weintraub S, et al. Classification of primary progressive aphasia and its variants. Neurology. 2011;76(11):1006-1014.OpenUrlAbstract/FREE Full Text14.↵McKeith IG, Boeve BF, Dickson DW, et al. Diagnosis and management of dementia with Lewy bodies: fourth consensus report of the DLB Consortium. Neurology. 2017;89(1):88-100.OpenUrlAbstract/FREE Full Text15.↵Geschwind MD. Rapidly progressive dementia. Continuum (Minneap Minn). 2016;22(2 Dementia):510-537.OpenUrl16.↵Ances BM, Vitaliani R, Taylor RA, et al. Treatment-responsive limbic encephalitis identified by neuropil antibodies: MRI and PET correlates. Brain. 2005;128(Pt 8):1764-1777.OpenUrlCrossRefPubMed17.↵Gresa-Arribas N, Titulaer MJ, Torrents A, et al. Antibody titres at diagnosis and during follow-up of anti-NMDA receptor encephalitis: a retrospective study. Lancet Neurol. 2014;13(2):167-177.OpenUrlCrossRefPubMed18.↵Martinez-Martinez P, Titulaer MJ. Autoimmune psychosis. Lancet Psychiatry. 2020;7(2):122-123.OpenUrl19.↵van Coevorden-Hameete MH, Titulaer MJ, Schreurs MW, et al. Detection and characterization of autoantibodies to neuronal cell-surface antigens in the central nervous system. Front Mol Neurosci. 2016;9:37.OpenUrl20.↵Sabater L, Gaig C, Gelpi E, et al. A novel non-rapid-eye movement and rapid-eye-movement parasomnia with sleep breathing disorder associated with antibodies to IgLON5: a case series, characterisation of the antigen, and post-mortem study. Lancet Neurol. 2014;13(6):575-586.OpenUrlCrossRefPubMed21.↵Gaig C, Compta Y, Heidbreder A, et al. Frequency and characterization of movement disorders in anti-IgLON5 disease. Neurology. 2021;97(14):e1367–e1381.OpenUrlAbstract/FREE Full Text22.↵Gelpi E, Hoftberger R, Graus F, et al. Neuropathological criteria of anti-IgLON5-related tauopathy. Acta Neuropathol. 2016;132(4):531-543.OpenUrlCrossRefPubMed23.↵Landa J, Gaig C, Plaguma J, et al. Effects of IgLON5 antibodies on neuronal cytoskeleton: a link between autoimmunity and neurodegeneration. Ann Neurol. 2020;88(5):1023-1027.OpenUrlCrossRefPubMed24.↵Giannoccaro MP, Gastaldi M, Rizzo G, et al. Antibodies to neuronal surface antigens in patients with a clinical diagnosis of neurodegenerative disorder. Brain Behav Immun. 2021;96:106-112.OpenUrl25.↵Hermann P, Zerr I. Rapidly progressive dementias - aetiologies, diagnosis and management. Nat Rev Neurol. 2022;18(6):363-376.OpenUrl26.↵Dechelotte B, Muniz-Castrillo S, Joubert B, et al. Diagnostic yield of commercial immunodots to diagnose paraneoplastic neurologic syndromes. Neurol Neuroimmunol Neuroinflamm. 2020;7(3):e701.OpenUrlAbstract/FREE Full Text27.↵van Sonderen A, Schreurs MW, de Bruijn MA, et al. The relevance of VGKC positivity in the absence of LGI1 and Caspr2 antibodies. Neurology. 2016;86(18):1692-1699.OpenUrlCrossRefPubMed28.↵Muñoz Lopetegi A, Boukhrissi S, Bastiaansen A, et al. Neurological syndromes related to anti-GAD65: clinical and serological response to treatment. Neurol Neuroimmunol Neuroinflamm. 2020;7(3):e696.OpenUrlAbstract/FREE Full Text29.↵Mattozzi S, Sabater L, Escudero D, et al. Hashimoto encephalopathy in the 21st century. Neurology. 2020;94(2):e217-e224.OpenUrlAbstract/FREE Full Text30.↵Flanagan EP, Geschwind MD, Lopez-Chiriboga AS, et al. Autoimmune encephalitis misdiagnosis in adults. JAMA Neurol. 2023;80(1):30-39.OpenUrl
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Research study - can you help?

Research study - can you help? | AntiNMDA | Scoop.it
From www.encephalitis.info - June 19, 2023 9:38 PM
Researchers at Kings College London are looking for young people to travel to London and help with an encephalitis study...
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Sociocultural Influences in Autoimmune Encephalitis Without Neurologic Symptoms

Sociocultural Influences in Autoimmune Encephalitis Without Neurologic Symptoms | AntiNMDA | Scoop.it
From www.psychiatrist.com - June 19, 2023 9:33 PM
This complex case highlights barriers to identifying autoimmune encephalitis when no neurologic symptoms are present, which are normally central to disease detection.
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Anti N-Methyl-D-Aspartate receptor antibody associated Acute Demyelinating Encephalomyelitis in a patient with COVID-19: a case report | Journal of Medical Case Reports | Full Text

Anti N-Methyl-D-Aspartate receptor antibody associated Acute Demyelinating Encephalomyelitis in a patient with COVID-19: a case report | Journal of Medical Case Reports | Full Text | AntiNMDA | Scoop.it
From jmedicalcasereports.biomedcentral.com - June 19, 2023 9:27 PM
Background Anti N-Methyl-D-Aspartate (NMDA) receptor antibody associated ADEM is a diagnosis that was first described relatively recently in 2007 by Dalmau et al. The recent COVID-19 pandemic has resulted in multiple neurological complications being reported.
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Autoimmune Encephalitis Consensus Criteria | Neurology Clinical Practice

Autoimmune Encephalitis Consensus Criteria | Neurology Clinical Practice | AntiNMDA | Scoop.it
From cp.neurology.org - June 14, 2023 7:42 PM
June 2023; 13 (3) Editorial Autoimmune Encephalitis Consensus CriteriaLessons Learned From Real-World Practice View ORCID ProfileJeffrey M. Gelfand, Chu-Yueh Guo First published April 25, 2023, DOI: https://doi.org/10.1212/CPJ.0000000000200155 Full PDF Citation Permissions Make Comment See Comments Downloads133 Share Article Info & Disclosures This article requires a subscription to view the full text. If you have a subscription you may use the login form below to view the article. Access to this article can also be purchased. Autoimmune encephalitis (AE) encompasses a spectrum of neurologic disorders caused by brain inflammation, a subset of which is associated with autoantibodies to neuronal cell-surface antigens such as anti-N-methyl-d-aspartate (NMDA) receptor AE or anti-leucine-rich glioma-inactivated 1 (LGI1) AE.1 Up to half of patients with AE, however, do not have abnormal neuronal or glial autoantibodies identified and are classified as having “seronegative” AE.2 Clinical antibody testing can take several days to result, a time in which clinicians caring for patients with suspected AE may wish to initiate empiric immunosuppressive therapy. Antibody testing is also not readily accessible in some health care settings and, even when technically available, may require time-consuming advocacy with local clinical laboratories to justify relatively costly send-out testing. To add further complexity, some patients with immunoreactive (e.g., laboratory true-positive) antibodies do not have clinical AE, and over-reliance and misapplication of antibody testing were identified as important contributors to AE misdiagnosis in a 2023 multicenter analysis.3FootnotesFunding information and disclosures are provided at the end of the article. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp.See page e200151© 2023 American Academy of NeurologyView Full Text AAN Members We have changed the login procedure to improve access between AAN.com and the Neurology journals. If you are experiencing issues, please log out of AAN.com and clear history and cookies. (For instructions by browser, please click the instruction pages below). After clearing, choose preferred Journal and select login for AAN Members. You will be redirected to a login page where you can log in with your AAN ID number and password. When you are returned to the Journal, your name should appear at the top right of the page. Google Safari Microsoft Edge Firefox Click here to login AAN Non-Member Subscribers Click here to login Purchase access For assistance, please contact: AAN Members (800) 879-1960 or (612) 928-6000 (International) Non-AAN Member subscribers (800) 638-3030 or (301) 223-2300 option 3, select 1 (international) Sign Up Information on how to subscribe to Neurology and Neurology: Clinical Practice can be found here Purchase Individual access to articles is available through the Add to Cart option on the article page. Access for 1 day (from the computer you are currently using) is US$ 39.00. Pay-per-view content is for the use of the payee only, and content may not be further distributed by print or electronic means. The payee may view, download, and/or print the article for his/her personal, scholarly, research, and educational use. Distributing copies (electronic or otherwise) of the article is not allowed. You May Also be Interested in Back to top Safety and Efficacy of Tenecteplase and Alteplase in Patients With Tandem Lesion Stroke: A Post Hoc Analysis of the EXTEND-IA TNK Trials Dr. Nicole Sur and Dr. Mausaminben Hathidara ► Watch Related Articles Autoimmune Encephalitis Criteria in Clinical Practice Topics Discussed All Clinical Neurology Autoimmune diseases Encephalitis Alert Me Alert me when eletters are published
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Predictive Value of Serum Neurofilament Light Chain Levels in Anti-NMDA Receptor Encephalitis

Predictive Value of Serum Neurofilament Light Chain Levels in Anti-NMDA Receptor Encephalitis | AntiNMDA | Scoop.it
From pubmed.ncbi.nlm.nih.gov - June 14, 2023 7:41 PM
Increased serum NfL levels reflect neuroaxonal damage in anti-NMDAR encephalitis. No relationship was identified with disease severity, whereas the association with outcome was confounded by age.The implied role of sampling timing on NfL levels also limits the applicability of NfL as a prognostic...
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Frontiers | The MOG antibody associated encephalitis preceded by COVID-19 infection; a case study and systematic review of the literature

Frontiers | The MOG antibody associated encephalitis preceded by COVID-19 infection; a case study and systematic review of the literature | AntiNMDA | Scoop.it
From www.frontiersin.org - September 5, 2023 11:22 AM
BackgroundNew neurological complications of COVID-19 infection have been reported in recent research. Among them, the spectrum of anti-MOG positive diseases, defined as anti-MOG antibody associated disease (MOGAD), is distinguished, which can manifest as optic neuritis, myelitis, or various forms...
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Enceph-IG Study - Institute of Infection, Veterinary and Ecological Sciences - University of Liverpool

Enceph-IG Study - Institute of Infection, Veterinary and Ecological Sciences - University of Liverpool | AntiNMDA | Scoop.it
From www.liverpool.ac.uk - August 6, 2023 7:27 PM
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A Rare Presentation of Steroid-responsive Encephalopathy Associated with Autoimmune Thyroiditis with Neuropsychiatric Symptoms: A Case Report

A Rare Presentation of Steroid-responsive Encephalopathy Associated with Autoimmune Thyroiditis with Neuropsychiatric Symptoms: A Case Report | AntiNMDA | Scoop.it
From touchneurology.com - July 27, 2023 11:22 AM
A 42-year-old woman presented in the emergency department with acute onset whole-body myoclonic jerks for 1 day.On enquiry, the patient’s parents advised...
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Pioneering Research in Autoimmune Neurology: Vanda Lennon, M.D., Ph.D.

Pioneering Research in Autoimmune Neurology: Vanda Lennon, M.D., Ph.D. | AntiNMDA | Scoop.it
From news.mayocliniclabs.com - July 27, 2023 11:05 AM
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New center to spotlight neurological autoimmune disorders

New center to spotlight neurological autoimmune disorders | AntiNMDA | Scoop.it
From bioengineer.org - July 14, 2023 2:19 PM
How do neurological disorders arise that are caused, triggered, or influenced by antibodies? What better possibilities are there for diagnosis – and above all for treatment? These are the questions addressed by the new Clinical Research Unit “BecauseY” headed by Charité – Universitätsmedizin Berlin.
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Progressive alliance advances science through patient-powered research

Progressive alliance advances science through patient-powered research | AntiNMDA | Scoop.it
From news.mayocliniclabs.com - July 14, 2023 2:16 PM
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ENCEPH-IG Trial: The Challenges Of Running A Rare Disease Trial - Centre for Trials Research

ENCEPH-IG Trial: The Challenges Of Running A Rare Disease Trial - Centre for Trials Research | AntiNMDA | Scoop.it
From blogs.cardiff.ac.uk - June 19, 2023 9:46 PM
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30 neurological disorders every doctor should know about –

30 neurological disorders every doctor should know about – | AntiNMDA | Scoop.it
From theneurologylounge.com - June 19, 2023 9:42 PM
Neurology is a jungle of disorders and syndromes. This creates a challenge for doctors and medical students... What to prioritise for learning and practice? *** To solve this conundrum... We combed the extensive database of Neurochecklists...
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A score that predicts 1-year functional status in patients with anti-NMDA receptor encephalitis

A score that predicts 1-year functional status in patients with anti-NMDA receptor encephalitis | AntiNMDA | Scoop.it
From pubmed.ncbi.nlm.nih.gov - June 19, 2023 9:34 PM
The NEOS score accurately predicts 1-year functional status in patients with anti-NMDAR encephalitis. This score could help estimate the clinical course following diagnosis and may aid in identifying patients who could benefit from novel therapies.
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Canadian Blood Services needs thousands more donors to roll up their sleeves | CBC News

Canadian Blood Services needs thousands more donors to roll up their sleeves | CBC News | AntiNMDA | Scoop.it
From www.cbc.ca - June 19, 2023 9:28 PM
Canadian Blood Services is looking to fill 150,000 appointments for people willing to donate their blood or plasma to tackle a shortage.
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A catatonic woman awakened after 20 years. Her story may change psychiatry – My Health CRM

A catatonic woman awakened after 20 years. Her story may change psychiatry – My Health CRM | AntiNMDA | Scoop.it
From myhealthcrm.com - June 14, 2023 7:43 PM
New research suggests that a subset of patients with psychiatric conditions such as schizophrenia may actually have autoimmune disease that attacks the brain...
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Case Report: Paroxysmal weakness of unilateral limb as an initial symptom in anti-LGI1 encephalitis: a report of five cases

Case Report: Paroxysmal weakness of unilateral limb as an initial symptom in anti-LGI1 encephalitis: a report of five cases | AntiNMDA | Scoop.it
From pubmed.ncbi.nlm.nih.gov - June 14, 2023 7:41 PM
Anti-leucine-rich glioma-inactivated 1 (LGI1) encephalitis is the second most common kind of autoimmune encephalitis following anti-N-methyl-d-aspartate receptor (NMDAR) encephalitis.Anti-LGI1 encephalitis is characterized by cognitive impairment or rapid progressive dementia, psychiatric disorders...
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Medical Moment: The signs of ‘brain-on-fire’ disease

Medical Moment: The signs of ‘brain-on-fire’ disease | AntiNMDA | Scoop.it
From www.wndu.com - June 14, 2023 7:40 PM
(WNDU) - Imagine being totally fine one day, then the next, you’re having hallucinations, seizures, memory loss, and even trouble talking.It’s called “brain-on-fire” disease or anti-NMDA receptor encephalitis. It’s a rare neurological disorder that can cause inflammation in the brain.It occurs when the body’s immune system mistakenly attacks the NMDA receptors in the brain, which are responsible for regulating communication between nerve cells. Brain-on-fire disease is often misdiagnosed as other neurological disorders or psychiatric illnesses because its symptoms are similar to those of many other conditions.However, a blood or cerebrospinal fluid test can help diagnose the disease by detecting the presence of antibodies that attack the NMDA receptors in the brain. The disease is rare as it affects one in 1.5 million people a year.Katie Miller would be one of those people.Hunting, mountain biking, horseback riding - you name it, Katie Miler would do it... until she couldn’t.“I just didn’t feel like myself, like normal,” Katie recalled.“Katie said, ‘Mom, I feel like my brain snapped,’” said Colleen Miller, Katie’s mother.Local doctors admitted Katie into a psychiatric ward, but what was happening to Katie wasn’t mental; it was physical.“What happens is you’re perfectly normal one day, and suddenly overnight, this person can become paranoid, can start having visual hallucinations, auditory hallucinations,” explained Stacy Clardy, MD, PhD, an autoimmune neurologist at the University of Utah.Anti-NMDA receptor encephalitis is misdiagnosed as a psychiatric disorder in up to 40% of patients.“So, for many of the females, especially after puberty, they can develop what’s called an ovarian dermoid cyst or an ovarian teratoma,” Dr. Clardy said.These cysts often have hair and teeth in them. The immune system sees it as foreign and attacks it, but...“In these cysts, there is a component of tissue that really is brain tissue,” Dr. Clardy continued.Within four days, Katie was catatonic and needed a ventilator to breathe. There is no single approved treatment. That’s why a five-year, nationwide clinical trial is testing whether a drug called Inebilizumab will stop the assault on the brain. It has the potential to improve outcomes for patients who are not responding to other treatments and may also lead to fewer long-term neurological effects.Katie had her cyst removed; she can’t remember three months of her life. But now, with various medications, Katie is on her way to recovery.Up to 50% of patients can suffer long-term consequences, especially cognitive and mood symptoms.Copyright 2023 WNDU. All rights reserved.
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