ECT ( electro convulsant therapy) is not used as much these days as anti depressants are much more therapeutic than they were before. As a former mental nurse I have seen this form of treatment often in the 1980’s and 1990’s. It is very safe and well administered under general anaesthetic.
I have seen patients who were catatonic, or extremely depressed, recover only after the use of ECT. It does work and if someone has recovered through its use and requests it again it is given. Maybe a course of 5 or 6 sessions depending on how the patient responds to each one.
Often people have used conventional medications to no avail. I can completely empathise and understand why they choose this therapy rather than live their lives feeling in despair and without hope due to their condition.