Treatment for depression has improved remarkably over the past 25 years. The techniques of administering ECT also have improved considerably since its introduction. We know that ECT works: 70% to 90% of depressed people who receive it, respond favorably, making it the most effective treatment available for severe depression. The plan for using ECT should be consistent with the patient's right to know why this form of treatment is indicated in his or her case, the expected outcome of treatment, and the side effects and risks associated with the treatment.