I am sorry to hear about your husband's recent heart attack. You definitely did a great job starting CPR! A defibrillator will shock the heart when it goes into abnormal
rhythms like ventricular fibrillation or ventricular tachycardia, which can be life-threatening heart rhythms. These rhythms can be caused by a heart attack. A heart attack occurs when there is a blockage in an artery of the heart preventing blood flow and oxygen to reach an area of the heart. This can still occur in a person with a defibrillator, but there is some protection because a shock can be delivered immediately if one of the life threatening rhythms occurs.
It is very important to control all of the risk factors for heart attack such as blood pressure, cholesterol, blood sugar, stop smoking, eat a healthy diet, exercise (as allowed by the physician)in order to further decrease the risk for future heart problems.