How long one can live after a massive heart attack with a cardiac arrest?

Very Individual: The answer is completely individual depending upon the extent of the damage that was done to the heart muscle, the age of the person and their other medical conditions. Sustaining a cardiac arrest during a heart attack simply indicates there was a period of electrical instability and does not worsen the prognosis. Even with massive heart attacks the survival can be decades long with best care.

Life: Many many years with expert evaluation and follow up. Very important is the follow up with your md.

Best care: I completely agree with dr. Radwaner.\ best care is important to improve survival after a massive heart attack. Very important to follow your doctor's recommendation.