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Major Psychiatric Disorders Subsequent to Treating Epilepsy by Vagus Nerve Stimulation
Epilepsy & Behavior : E&B
|March 1, 2003
Summary
Vagus nerve stimulation (VNS) for epilepsy can lead to psychiatric disorders, including severe dysphoria and rage, in 9% of patients. Prompt psychiatric intervention is crucial for managing these adverse events.
Area of Science:
- Neurology
- Psychiatry
Background:
- Epilepsy treatment often involves managing associated psychiatric comorbidities.
- Vagus nerve stimulation (VNS) is an established therapy for refractory epilepsy.
Purpose of the Study:
- To document the incidence, phenomenology, pathogenesis, and treatment of psychiatric disorders following vagus nerve stimulation (VNS) in epilepsy patients.
Main Methods:
- Systematic psychiatric evaluation and psychotropic medication treatment were administered to 81 epilepsy patients who developed psychiatric complications during VNS therapy.
- VNS parameters were adjusted as necessary.
Main Results:
- Nine percent (7 of 81) of patients developed major psychiatric disorders after at least 75% seizure reduction.
- These included severe dysphoria, catastrophic rage, and psychotic episodes, particularly in patients with pre-existing psychiatric conditions or frequent daily seizures.
- Psychotropic medication led to remission or improvement in 6 patients, with VNS modification in two.
Conclusions:
- VNS-induced seizure suppression can precipitate severe interictal dysphoric disorders, including rage and psychosis, in vulnerable epilepsy patients.
- Patients with frequent daily seizures and prior psychiatric issues are at higher risk.
- Effective psychiatric management, including psychotropic medication and potential VNS adjustment, is essential for favorable outcomes.