A dual chamber pacemaker paces the atrium and ventricle. A biventricular pacemaker paces both ventricles. An implantable cardioverter-defibrillator can function as a pacemaker would. In addition, if it detects ventricular tachycardia or fibrillation, it sends out a shock to reset the heart to a normal rhythm.
What You Don't Know Will Kill You - You've probably heard of an automatic external defibrillator, and you may have even seen one attached to a wall like a fire extinguisher. But do you know what they are, how they work, or when to even use it?