Postictal Psychosis in Epilepsy: A Clinicogenetic Study

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Psychosis in epilepsy increases disease burden and reduces quality of life.
• Postictal psychosis accounts for approximately 25% of epilepsy-related psychoses.
• The exact causes of postictal psychosis remain largely unknown.

Purpose of the Study:

• To characterize the clinical and genetic factors associated with postictal psychosis.
• To investigate the relationship between epilepsy characteristics and postictal psychosis.
• To explore the genetic overlap between postictal psychosis and schizophrenia.

Main Methods:

• A case-control cohort study was conducted, including 49 patients with postictal psychosis and 98 controls.
• Patients were assessed for epilepsy, psychiatric history, and psychosis profiles.
• Logistic regression analyzed clinical factors; polygenic risk scores for schizophrenia were calculated.

Main Results:

• Postictal psychosis cases showed higher rates of seizure clustering (OR=7.59), recollected aura (OR=2.49), and family psychiatric history (OR=5.17).
• Right temporal epileptiform discharges were more common in cases (OR=4.87).
• Significantly higher polygenic risk scores for schizophrenia were observed in postictal psychosis cases compared to epilepsy controls.

Conclusions:

• Postictal psychosis is associated with specific seizure characteristics and a family history of psychiatric disorders.
• A heightened genetic predisposition to schizophrenia may play a role in the development of postictal psychosis.
• The findings suggest an interaction between epilepsy biology and genetic susceptibility to schizophrenia.