Psychotic Disorders in Epilepsy: Do They Differ from Primary Psychosis?

Area of Science:

• Neuroscience and Psychiatry
• Epileptology
• Psychotic Disorders

Background:

• Primary psychoses and psychoses in patients with epilepsy (PWE) exhibit significant heterogeneity, complicating direct comparisons.
• Existing diagnostic frameworks struggle to categorize psychotic disorders in PWE, necessitating a nuanced approach.
• The relationship between epilepsy and psychosis is complex, involving various subtypes and potential causal pathways.

Purpose of the Study:

• To compare the diagnostic definitions of primary psychoses with those of psychotic disorders in PWE.
• To critically evaluate the distinctiveness of postictal psychosis, interictal psychosis, and primary psychotic disorders like schizophrenia.
• To explore the potential influence of epilepsy on psychosis development and vice versa.

Main Methods:

• Review and comparison of diagnostic criteria for five primary psychotic disorders (DSM-5) against postictal and interictal psychoses in PWE.
• Analysis of proposed diagnostic criteria for psychotic disorders in PWE, including postictal psychosis, comorbid schizophrenia, AED-induced psychotic disorder (AIPD), and forced normalization.
• Examination of three key comparative questions: postictal psychosis vs. brief psychotic disorder, epilepsy's role in psychosis development, and interictal psychosis vs. process schizophrenia.

Main Results:

• Direct comparison between postictal psychosis and schizophrenia is deemed inappropriate due to differing clinical courses.
• Schizophrenia may not be a suitable comparison for acute/subacute conditions like forced normalization and AED-induced psychotic disorder (AIPD).
• Interictal psychosis in PWE is an aggregate of disorders, including comorbid schizophrenia, AIPD, forced normalization, and 'epileptic' interictal psychosis.

Conclusions:

• The antagonism between psychosis and epileptic seizures may require nervous system reorganization, potentially influenced by genetic predisposition and epileptic activity.
• Further research is needed to determine differences between process schizophrenia and 'epileptic' interictal psychosis regarding negative symptoms, traits, and content.
• Clarifying these distinctions can enhance the understanding and focus on process schizophrenia.