anti-nmda receptor encephalitis: psychiatric presentation and diagnostic challenge
TRANSCRIPT
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Anti-NMDA receptor encephalitis: Psychiatric presentation and
diagnostic challenge
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Introduction► First reported in 2005► Severe form of autoimmune encephalitis: anti-
bodies against NR1-NR2 heteromers of the NMDA receptor
(Chapman and Vause, 2011)► Conceptualized as a condition primarily
affecting adult women with ovarian tumors► Increasingly recognized among adult males,
children, and those with the absence of tumors as well
(Barry et al., 2011)
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Introduction
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Why Anti-NMDA receptor encephalitis?
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Typical Pathway of Care
Acute psychosis, alteredbehavior, and catatonia
Evaluated initially by a psychiatrist
Seizures, autonomic instability’ altered consciousness or dyskinesia alerts the possibility of neurological pathology
Neurologist Around 4% of the cases present with isolated psychiatric episodes without neurological involvement (Kayser et al., 2013)
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Investigations
► Brain MRI In 50%, T2 or FLAIR signal hyperintensity in
various brain regions ► EEG – usually abnormal in most patients
Non-specific, slow and disorganized activity Epileptic activity in some Extreme delta brush is a novel finding The presence of this pattern is associated
with a more prolonged illness Specificity of this pattern is unclear
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Extreme Delta Brush Pattern
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Extreme Delta Brush Pattern
EEG showing diffuse slowing characterized by rhythmic delta activity 1-3 Hz with superimposed bursts of rhythmic 20–30 Hz beta frequency activity on each delta wave.
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Investigations
► CSF Abnormal in 80% initially and in almost all in
later part of illness Moderate lymphocytic pleocytosis, mildly
increased protein, oligoclonal bands Less commonly found in children (?Earlier
recognition of illness in children)► Brain biopsy – non-specific► Serum and CSF anti-NMDAR antibody (specific and
sensitive)
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Differential Diagnosis
► Infections of the brain (mainly viral)► Other autoimmune encephalitis► CNS Vasculitis► Acute transient psychotic disorder
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Management► Usual management: Immunotherapy and
tumor removal (when present)► First line: corticosteroids, IV Ig or plasma
exchange Enhanced effect and speed of action
when underlying tumor removed► Patients without tumor or with delayed
diagnosis – may require 2nd line immunotherapy (Rituximab or Cyclophosphamide, or both)
(Florence et al., 2009)
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Role of antipsychotic medications/ECT
► Most of the reports suggest use of antipsychotic initially during the course of illness
► Reason: misdiagnosis as a case of Psychosis or control of behavioral problems
ECT► A study reported use of ECT in 2 out of
31 cases (No further details available)(Florence et al., 2009)
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Sequelae► If treated – remission in 75% cases (mild
neurological sequel may be present)► If untreated, expected outcome
Neurological sequel – 75% Relapse – 25% Mortality – 20%
(Tambi et al., 2011)► Spontaneous recovery of 4 pts over 7
months hospital stay (Iizuka et al., 2008)
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Summary of course
(Kayser and Dalmau, 2011)
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Sex, tumor association and triggers
► 80% of patients with anti-NMDAR encephalitis women
► Most common tumor – ovarian teratoma (>90%)
► Younger the patient, lesser the likelihood of underlying tumor association 10% in aged 7-12 years, 40% in 13-18
yearsHofmann et al., 2010; Verhelst et al., 2010;; Dalmau et al., 2011
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Clinical features in children
► Temper tantrums, hyperactivity, irritability► First symptom usually non-psychiatric in
children in up to 70% cases (e.g. seizures, dystonia, decreased verbal output, mutism etc.)
► Movement disorder: comparable with adults► Autonomic manifestations are less severe► Hypersexual and violent behaviors (e.g. kicking
and biting caregivers and parents) commonArmangue et al., 2013; Baizabal-Carvallo et al., 2013
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Clinical features in children
► In children, association with an infectious process Two cases developed illness after H1N1
vaccination One patient after a vaccination against
tetanus, diphtheria, pertussis A child with this illness – microdeletion in the
short arm of chromosome 6 (involving HLA cluster, suggesting a predisposition to autoimmunity)
Hofmann et al., 2010; Verhelst et al., 2010; Dalmau et al., 2011
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Investigations
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Antibody Specificity► Serum NMDAR antibodies in 1 of 215 patients with
CNS demyelinating diseases, suggesting that the frequency of those auto-antibodies is very low (<1%): had symptoms of NMDA encephalitis
(Ramberger et al, 2015)► Individuals with schizophrenia or schizoaffective,
bipolar, or major depressive disorders are collectively about three times more likely to have elevated NMDAR antibody titers compared with healthy controls
(Pearlman and Najjar, 2014)
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Anti-NMDAR antibody and PsychosisSteiner et al, 2013:
Most antibodies bound to NR1/2B construct Vs. NR1-IgG1 in Autoimmune encephalitis
Masdau et al, 2012Unable to detect IgG Ab aginst 80 pts of schizophrenia
Dalmau et al, 2008 (Review article )Testing for IgG NR1 Ab in schizophrenia not indicated
Rhoads et al, 2011:None of 7 pts with chronic antipsychotic treated
schizophrenia had detectable NMDARNR1-IgG1 specific to Autoimmune encephalitis
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Implications► The glutamatergic theories of schizophrenia:
based on the ability of N-methyl-D-aspartate receptor (NMDAR) antagonists to induce schizophrenia-like symptoms
► There is emergent literature documenting disturbances of NMDAR-related gene expression and metabolic pathways in schizophrenia
(Moghaddam and Javitt, 2012)► The early presentation of psychosis in anti-
NMDAR encephalitis might be evidence of this
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Implications► There are increasing numbers of recognized
auto antibodies against receptors other than anti-NMDA that are seen in psychosis
(Endres et al., 2015)
► Studies show there is a significantly higher rate of positivity of NMDAR antibodies in child and adolescent psychosis than in adult-onset psychosis
(Pathmanandavel et al., 2015)
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My experience
► There are very few reports from India for this relatively rare illness.
► A case of anti NMDAR encephalitis in a young girl without a history of systemic neoplasm- challenges faced in diagnosing and treating her.
► Onset after a traumatic stressor (incidental or related to autoimmune process?)
► Stressor incorporated in psychopathology► Treatment induced mood disorder in the patient..
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Challenges
► Presence of multiple psychiatric symptoms at presentation
► No definitive neurological findings on investigations – MRI, EEG normal
► Catatonic symptoms – general understanding of being associated with psychiatric disorders
20-39% have organic disorders = 35 % in schizophrenia
Ahuja, 2000
► Seizures and dyskinesia confused with side effect of antipsychotics
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Challenges – Our Context
► Lack of Lab Facilities that can detect NMDA auto antibodies
► MRI and EEG: Cost and availability issues ► ? Liaison between Psychiatrists and
Neurologists► Cost of Treatment: IV IG► Our struggles
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Way Forward
► Should we have a guidelines for empirical diagnosis once some indicators are detected like delta brush in EEG or classic presentation
► Should we treat empirically?► If so our own criteria for stating empirical
steroid pulse in acute psychosis?
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Thank you