About one third of people who have heart attacks die as a result. Some die before they reach hospital, or within 28 days of the attack.
The older you are, the more likely you are to have life-threatening complications. The longer it takes to get treatment also affects your chances of survival, as well as how much damage your heart suffers during the heart attack.
If you live beyond 28 days, your chance of surviving and living for many years rises significantly.