One of the oldest and most effective methods involves small electric currents being passed through the brain, triggering a brief seizure, while the patient is under general anaesthesia. This has proven effective in treating severe depression, catatonia and agitation in people with manic disorders. It seems to cause changes in brain chemistry that quickly reverse the symptoms. Used when other treatments fail and the full course of treatment is over, it doesn’t work for everyone.
Yoga is a part of treatment in certain cases of mild depression. Biological markers give some pointers about its remedial effects. Psychiatrists say there are instances where the depression is resolved in about 3-4 weeks, around the same time that anti-depressants will also produce a change. But in severe depression, these interventions won’t produce much effect....