Seizure Duration and Electroconvulsive Therapy in Major Depressive Disorder

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Research

Background:

• Electroconvulsive therapy (ECT) is a treatment for major depressive disorder (MDD).
• The relationship between electroencephalographic (EEG) seizure duration and ECT treatment outcomes remains unclear.
• Understanding this association is crucial for optimizing ECT protocols.

Purpose of the Study:

• To investigate the association between EEG seizure duration and treatment outcomes in patients with MDD.
• To explore the influence of confounding variables, including concomitant pharmacological treatments, on this relationship.
• To determine optimal seizure durations for improved remission rates in ECT.

Main Methods:

• A population-based cohort study utilizing data from the Swedish National Quality Register for ECT.
• Included patients with unipolar MDD treated with unilateral ECT between 2012 and 2019.
• Analyzed electroencephalographic (EEG) seizure duration and remission rates using multivariate logistic regression.

Main Results:

• A total of 6998 patients were included in the study.
• Patients with EEG seizure durations of 60-69 seconds exhibited the highest remission rates (OR, 2.17) compared to those with durations <20 seconds.
• Concomitant use of anticonvulsant medications was linked to shorter seizure durations and lower remission rates (e.g., lamotrigine: adjusted OR, 0.67).

Conclusions:

• EEG seizure duration is significantly associated with remission rates in patients undergoing ECT for MDD.
• Optimal seizure duration for remission appears to be in the 60-69 second range.
• Anticonvulsant medications may negatively impact ECT efficacy by reducing seizure duration and remission rates.