Body Mass Index is a way of determining obesity which we know is a risk factor for a woman having heart attack or heart disease. The Body Mass Index is the weight in kilograms, divided by the height in meters squared. It’s a mathematical calculation, and we really want the number to be 25 or lower; that’s a patient that has an acceptable risk. Once the number gets above 25, the patient is carrying around extra weight that may put her at a higher risk of a heart problem or heart attack.