What people need pacemakers?

HeartRhythm or block: The most common indicators for an implanted pacemaker are bradycardia (slow heart rate), tachycardia (fast heart rate) and heart block (when the heart stops beating for several seconds).

Slow heart rate: The typical reason to get a pacemaker is slow heart rate *hr), say, below 40 beats a minute. Some people get pacemakers because their hr won't increase with exercise. The most common reason is atrial fibrillation, which can often lead to slow hr. Slow hr causes fatigue or out of breath with exertion or passing out. Some people get special pacemakers to improve heart function if the heart is weak.