Early Complete Remitters After Electroconvulsive Therapy: Profile and Prognosis

Area of Science:

• Psychiatry
• Neuroscience
• Clinical Psychology

Background:

• Electroconvulsive therapy (ECT) is a highly effective treatment for severe depression.
• Understanding predictors of early treatment response can optimize patient outcomes.
• Right unilateral (ultra)brief pulse ECT is a commonly used modality.

Purpose of the Study:

• To determine the prevalence and characteristics of patients achieving early complete remission (ECR) with right unilateral (ultra)brief pulse ECT.
• To compare ECRs with late complete remitters (LCRs) and nonremitters/nonresponders (NRs).
• To investigate the 6-month prognosis of ECRs.

Main Methods:

• Defined ECRs as achieving a Clinical Global Impression score of 1 within 4 ECT sessions and a Montgomery Åsberg Depression Rating Scale score <10.
• Compared ECRs (n=12) with LCRs (n=9) and NRs (n=27) from 87 patients.
• Assessed demographic, clinical, and cognitive characteristics, and 6-month relapse rates.

Main Results:

• 57.5% of patients achieved remission; 14% were ECRs and 10% were LCRs.
• ECRs were older (71.0 vs 53.9 years), had shorter depressive episodes (5.8 vs 15.4 months), and more psychotic features (75% vs 22%) than LCRs.
• ECRs showed a significantly lower relapse rate (10% vs 62.5%) over 6 months.

Conclusions:

• Older patients with psychotic depression and cognitive slowing are likely to achieve rapid ECT remission.
• Early complete remission within 4 ECT sessions is associated with a favorable 6-month prognosis.
• Right unilateral (ultra)brief pulse ECT is effective for achieving rapid remission in specific patient subgroups.