I am very sorry to hear about your wife.

In answer to your question studies of brain activity, and interviews with people who have recovered give insights into this. Is this something that bothers you or are you hoping she was able to hear?

Death from heart attacks take people by surprise, a substantial number of people never new they had heart disease until a fatal heart attack struck them down.

If you are interested in finding out more info on heart disease, read "answers to: heart disease" by wolff. Very compelling and interesting read. Explains why so many people are dying from this disease despite the enormous volume of meds we swallow every year to stop it.