A heart attack causes a sudden loss of blood supply to the heart muscle. It is the leading cause of death for both men and women. Around one in four people in the U.S die due to a heart disease every year. Smoking, high blood pressure and high cholesterol levels are some of the risk factors of a heart attack. Non-O blood group people are associated with a higher risk of heart attack finds a recent study presented at the Heart Failure 2017 and the 4th World Congress on Acute Heart Failure.