We've talked about women being most at risk for heart disease and heart attacks but now a new study shows that African Americans are also at high risk for having a heart attack. A heart attack can be considered a circulation problem and occurs when the blood supply to the heart is either reduced or completely cut off.  This can occur because of a blood clot or a narrowing of the arteries.  When the heart muscle doesn’t receive blood, the lack of oxygen causes damage and it begins to die.