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Heart rate, also called pulse, is the number of times your heart beats per minute. Heart rate can change based on activity level, age, medication, and other factors throughout life. For most adults, a resting heart rate of 50 to 100 beats per minute is considered normal.

A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate. Pacemakers are used to treat arrhythmias (ah-RITH-me-ahs). Arrhythmias are problems with the rate or rhythm of the heartbeat.

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