A Cardiac Pacemaker is a device placed externally or internally to treat patients with irregular heartbeat. Naturally, the heart beats are controlled through electrical impulses from sinus node. A pacemaker is administered to the patients with ‘cardiac arrhythmia’ when this natural system fails and results in heart problems with too slow, too quick, or an abnormal heart beat pattern.
link :- http://www.heart-consult.com/articles/dos-and-don%E2%80%99ts-cardiac-pacemaker
