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Electroconvulsive therapy (ECT) passes an electrical charge through the brain under brief general anaesthesia, with a muscle relaxant and oxygen. The charge is a train of brief electrical pulses applied through electrodes across both temples, on the right side only, or across the forehead, which drives a generalised seizure lasting about 30 seconds. The seizure is what is monitored: its length on the EEG and the length of the muscular seizure, timed by a cuff method. A course is usually 8 to 12 sessions, two to three times a week.
Electroconvulsive therapy (ECT) is a brain-stimulation treatment that passes an electrical charge through the brain to induce a generalised seizure lasting about 30 s. The charge is delivered transcranially as a train of electrical pulses. Brief-pulse ECT uses pulses of 0.5 to 2.0 ms; ultrabrief-pulse ECT uses pulses of 0.25 to 0.3 ms. The electrodes are placed bitemporally, over the right hemisphere only (right unilateral), or bifrontally. The electrode placement and the charge relative to the seizure threshold affect both efficacy and cognitive side effects. The procedure is carried out under controlled conditions with brief general anaesthesia, a muscle relaxant and continuous oxygenation. What is monitored is the induced seizure: its duration on the EEG, and the duration of the motor seizure measured by the cuff method. Usually 8 to 12 treatments are given in a course, two or three times per week.
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