'adult three things'

A pacemaker is a small device operated through a battery. It sends electrical impulses to the heart muscle to maintain a suitable heart rate and rhythm. A pacemaker may be used to treat fainting spells (syncope), congestive heart failure, and, rarely, hypertrophic cardiomyopathy. The pacemaker has two parts: the leads and a pulse generator. The pulse generator houses the battery and a tiny computer, and resides just under the skin of the chest. The leads are wires that are threaded through the veins into the heart and implanted into the heart muscle. They send impulses from the pulse generator to the heart muscle, as well as sense the heart's electrical activity. Each impulse causes the heart to contract. The pacemaker may have one to three leads, depending on the type of pacemaker needed to treat your heart problem.