IF the surgery (or something else done during it) caused the heart attack, then you *may* have a viable malpractice suit. But you need some medical evidence, like a doctor's opinion, in which the doctor identifies what caused the heart attack and how it occured, to show this. It's not enough that your husband had seemingly been in good heart health or that the heart attack occured during surgery--that does not prove cause and effect. It only shows that the timing was coincidental, but since otherwise health people do have heart attacks, a coincidence of timing is not sufficient to prove your case in court.Moreover, even if something during the surgery caused the heart attack, you would also have to show that there was negligence, or unreasonable carelessness--i.e. that a doctor did something wrong. If the medical team did everything they would normally be expected to do and it just happened that something triggered a heart attack, they would not be liable: liability is based on fault, or doing something wrong. So you have to show fault, or improper care, as well as causation.The first thing to do is to talk to doctors more and try to understand why this occured. Only if there is some evidenece of doctor (or hospital or clinic, etc.) fault might you have a case.