The authors compared the therapeutic efficacy of bilateral and
unilateral electroconvulsive therapy (ECT) in 51 patients with endogenous
depression who were randomly assigned to bilateral (N = 24) or unilateral
(N = 27) ECT. Seizures were monitored by oscilloscope. After 6 treatments
blind assessment on a modified Hamilton depression scale showed an 81.1%
improvement in the bilateral group compared with a 55.5% improvement in the
unilateral group. Additional treatments were prescribed ad libitum by a
hospital psychiatrist who was unaware of each patient's electrode
placement. The unilateral group received more total treatments and were
more frequently switched to bilateral ECT. These results were independent
of age, severity of illness, or sedative drug administration.Abstract Teaser