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There are two parts: a generator and wires (leads). View an animation of a pacemaker. The generator is a small battery-powered unit. It produces the electrical impulses that stimulate your heart to beat.
The primary purpose of a pacemaker is to maintain an adequate heart rate, either because the heart's natural pacemaker is not fast enough, or because there is a block in the heart's electrical conduction system.n the first half of the tracing, pacemaker stimuli at 60 beats per minute result in a wide QRS complex with a right bundle branch block pattern. Progressively weaker pacing stimuli are administered, which results in asystole in the second half of the tracing.