Electroconvulsive Therapy for Major Depression in the Oldest Old: Effects of Medical Comorbidity on Post-Treatment Survival.

This is a longitudinal study of 65 patients who were 80 years old or older at the time they were hospitalized for depression. Thirty-seven were treated with ECT and 28 with medication. Survival after 1, 2, and 3 years in the ECT group was 73.0%, 54.1%, and 51.4%, respectively. Survival after 1, 2, and 3 years in the non-ECT group was 96.4%, 90.5%, and 75.0%, respectively. The relatively high mortality rate in the ECT group in this study suggests that patients over 80 who undergo ECT have more severe physical illness than those who can be treated successfully with medication. Medical comorbidity is a major determinant of long-term outcome of depression in the oldest old.