A pacemaker is a small device that sends electrical impulses to the heart muscle to maintain a suitable heart rate.
Types of Pacemakers
The pacemaker has two parts: the leads and a pulse generator. There are different types of pacemakers. Some have one lead, pacing only the ventricles or the atria; others have two leads, pacing both chambers.
Single chamber pacemaker
1 lead in the upper or lower chamber of the heart.
Dual chamber pacemaker
1 lead in the upper chamber and one lead in the lower chamber of your heart