By Laura Fox The normal heart generates its own rhythm through specialized tissues found at the sinoatrial (SA) node. Electrical impulses from this region are transmitted to the rest of the heart resulting in contraction and relaxation and hence the filling and emptying of this organ with blood. In some cases, the heart is unable to undergo this cycle effectively creating the need for an artificial device or pacemaker. The primary role of these devices in Princeton, NJ is to normalize the heart...