Unilateral and bilateral ECT in elderly patients. A comparative study.

Twenty-nine depressed elderly patients receiving ECT were randomly assigned to a unilateral or bilateral group; post-ictal recovery times, memory changes, and clinical improvement during and after each course were measured by blind and independent observers. All patients but one showed full recovery on testing 3 weeks after treatment. There was no significant difference between the unilateral and bilateral groups either in terms of improvement or the number of treatments needed in each course. A good outcome was predicted by the presence of pathological guilt, impairment of work and interest, agitation, subjectively depressed mood, psychic anxiety and greater overall severity. Longer duration of illness predicted a relatively poor outcome. Memory functions showed uniform impairment before treatment, but during treatment all improved, with some changes reaching high statistical significance; on testing 3 weeks after treatment memory functions in all patients had reached normal values. There was no difference between the two groups. Post-ictal recovery times were significantly longer in the bilateral than in the unilateral group after the first treatment and after the fifth treatment more than three times as long. Recovery time showed a significant decrease during courses of unilateral treatment. There was a very low incidence of side-effects, and all were relatively mild. We conclude that unilateral ECT is a safe and highly effective treatment for selected elderly patients suffering from depression, but that there is nothing to be said for the continued use of bilateral ECT.