Depression in later life can be particularly stubborn, and ECT is often effective for it. A reasonable question follows: can anyone tell in advance whether it will work for a particular person?
This review searched five research databases and screened 2,149 articles, ultimately including 19 that examined predictors of response in older adults.
The most striking finding is how much did not predict anything. Brain scan measures that sound like they should matter — hippocampal volume, white matter changes, amyloid load, overall brain shrinkage — showed no significant relationship with whether someone improved. Salivary cortisol did not either.
A few smaller signals did emerge, including certain blood markers and how long people took to reorient after a treatment. But nothing has yet become a reliable test.
This matters because it sets honest expectations. If you are weighing ECT for an older parent, no one can currently scan their brain and tell you whether it will work. The decision has to be made on symptoms, severity and what has already been tried.
That uncertainty is uncomfortable, but knowing it is the truth is better than believing a prediction that does not exist. Your treating team can talk through what is known for your situation.