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Pacemakers continuously monitor the heart to treat bradycardia (a slow, irregular, or interrupted heartbeat). If a pacemaker detects a rhythm problem, it will send out small, undetectable electrical signals to correct it to restore the heart to a more normal rate.
Bradycardia is a slow heartbeat, usually fewer than 60 beats per minute. At this rate, the heart is not able to pump enough oxygen-rich blood to your body during normal activity or exercise. As a result, you may feel dizzy or have chronic lack of energy, shortness of breath, or even fainting spells. A pacemaker sends electrical signals to help restore the heart’s rhythm and help you feel better.