Compared with transcranial magnetic stimulation for people with treatment-resistant major depressive disorder, ECT relieves depression about twice as well, reducing the score on the Hamilton Rating Scale for Depression by about 15 points, while TMS reduced it by 9 points [REF].
ECT is used to treat people who have severe or prolonged mania;[REF] NICE recommends it only in life-threatening situations or when other treatments have failed[REF] and as a second-line treatment for bipolar mania [REF].