For me it had been a long road of ineffective meds and even a shot at TMS. I was quite reluctant to do it because I had been present in the '80s when they brought my sis out of treatment. Anesthesia wasn't used then so her experience was horrendous. I remembered what she had gone through and said, "No, thank you." Of course, eventually I changed my mind and opted in.

In general it's used for those patients who aren't responding to meds or for the patients they want a quick response from.