This document outlines information about pacemakers, including what a pacemaker is, who needs one, how they work, potential risks of surgery, and lifestyle effects. It also discusses electrophysiology studies and nursing care for patients with pacemakers. The main topics covered are what a pacemaker is, who may need one due to irregular heart rhythms, how a pacemaker monitors and regulates the heart rate through low electrical pulses, and post-op nursing care for pacemaker patients.