. >> reporter: dr justin coffey will lead the programme. >> i wouldn't be worried about recommending e c.t. knowing it's the single most effective form of treatment for depression. >> reporter: for this man, it was true. peter cornish said e c.t. saved his life. >> i felt very different right after that first procedure. >> reporter: as soon as you woke up. >> as soon as i woke up. >> reporter: after living nearly two decades with depression he considered drowning himself in a river. >> i was losing hope because i couldn't find anything working for me. >> here we go. >> reporter: then his psychiatrist suggested e c.t. a friend video taped the procedure. >> it's about the amount of electricity that it takes to light an old 60 watt light bulk for a few seconds much the person is asleep the whole time there's no pain or discomfort during the procedure. >> i wept in as one, and came out 20 minutes later feeling like a 7. >> reporter: the south american psychiatric association says 87% of severely depressed patients improve after e c.t. it can cause a change in the chemical brain waves. bu