My husband had open heart surgery after a cardiac arrest where he was out for 4 minutes. I kept up CPR and revived him. He had 5 arteries plugged to the point that one was recreating a path around itself. He waited one more month after the CA before he could have surgery. After the surgery, he immediately had a bleed, so they had to take him and open him up again to fix it. He used to be moody at times, but from the day he had the surgery he is transfixed on the idea that I did something to him to get rid of him (into a nursing home) and he argues about every little thing, is always snarky. He does the same thing with out 40 year old son who moved into our suite in our house. He only talks hockey and seems void of anything to do with feelings. He doesn't seem to think that there is anything ever to be sorry about and we live like this all the time, with him just going ballistic over simple things. He has had a brain scan and nothing seems to be to out of the ordinary. I have heard of other people having this happen and also people who were very miserable people their whole lives, suddenly turn into the kindest sweetest people you would ever know. Do you know what might cause this, and are there any studies being done about this? I appreciate any help you can give me. Thank you.