A heartbeat of 40 or less in a 90 year old is somewhat dangerous.
Although the heart rate decreases to a certain extent in older people, a heart rate of less than 40 beats per minute is generally not normal and is considered bradycardia.
Bradycardia in the elderly may indicate atrioventricular block, hypothyroidism, or degenerative changes in the sinus node, which may cause symptoms such as panic, dizziness, chest tightness, and fatigue, and in severe cases, even transient loss of consciousness. It is necessary to consult a doctor in time to find out the cause of the disease and then give appropriate treatment.
Bradycardia in the elderly should not be taken lightly, we need to care about the state of the elderly from time to time, and go to the hospital in time to further investigate the causes of bradycardia.