Hello Nana,
Welcome to the NeuroTalk Support Groups.

You will find a number of older posts regarding electroconvulsive therapy in the forums.
Here is the NT Search feature url.
http://neurotalk.psychcentral.com/search.php

You would find more info about long term effects at PsychCentral I would imagine.

Just took a look and found quite a number of articles there.

http://psychcentral.com/lib/an-overv...rapy-ect/00053
An Overview of Electroconvulsive Therapy (ECT)
By John Hauser, M.D.

There are many more if you type in ECT or electroconvulsive therapy into their search term area in the top right hand corner.