What did the first pacemaker look like?

The first pacemaker, developed in 1958 by Dr. Paul Zoll, was a large, bulky device that resembled a suitcase. It used external electrodes placed on the patient's chest to deliver electrical impulses to stimulate the heart. The device was not implantable and required continuous power from an external source, making it quite cumbersome compared to modern pacemakers. Over time, pacemaker technology evolved significantly, leading to smaller, implantable devices that are now widely used.