The normal range for a seventy-year-old heartbeat in a quiet state is also 60 to 100 beats per minute. A heart rate of more than 100 beats per minute is considered tachycardia, and a heart rate of less than 60 beats per minute is considered bradycardia. It is recommended to measure the heart rate in the resting state, but the heart rate may increase to more than 100 beats/minute after activity, exertion and stress. In most elderly patients, the function of the heart declines due to atherosclerosis, often leading to atrioventricular block and sick sinus node syndrome. Pacemaker implantation needs to be given when it causes significant slowing of the heart rate. In some patients, diseases such as hyperthyroidism or tachyarrhythmia can cause a marked increase in heart rate above 100 beats/minute. Patients are advised to undergo ECG and 24-hour ambulatory ECG monitoring to further clarify the diagnosis.