2d echo & tmt in yelahanka cardiologist near me Sudden Cardiac Death. This isn't the same as a heart attack. Sudden cardiac death happens when the heart's electrical system goes haywire, making it beat irregularly and dangerously fast. Instead of pumping out blood to your body, your chambers quiver. A defibrillator can help bring back a regular heart beat, but without it, the person can die within minutes. Start CPR while waiting for a defibrillator, u can save the person by CPR. So take care of your heart .