What causes slow heartbeat

summary

I believe that the heart rate is slow, you should not know it. Maybe the way of understanding is different. Today, when the unit organized physical examination and did ECG, the doctor said that my heart rate was a little slow, 50 times per minute, but it was regular. Nothing else. But I heard that the normal heart rate should be 60-100 per minute. Which means I'm not normal. What should I do?

What causes slow heartbeat

First: if a person's heart rate is less than 60 times per minute, it is called "bradycardia". Normal people or athletes may appear, especially athletes, because regular exercise makes the contractile strength of the heart increase, the output of blood per beat increases, enough to supply the needs of various organs of the body, so 50-60 beats per minute is enough. However, if the heart rate is only 30-40 beats per minute, it may be abnormal, so we need to check the reason.

Second: it is vagal hyperactivity. There is a nerve center in the medulla oblongata of the brain that regulates cardiovascular activity. This center can have the function of inhibiting or accelerating the heartbeat. The vagus nerve is the nerve fiber sent out by this center, which is used to control the heart beat and other functions. When the vagus nerve is excited, its endings can release a substance called "acetylcholine", which inhibits the heart and slows down the heartbeat. The bradycardia caused by "Mi Kang" is mostly regular. Although the heartbeat is slow, it is rarely less than 30-40 beats per minute. It can occur in normal people, including the elderly.

Third: slow heartbeat called "sick sinus syndrome", referred to as "sick sinus". This is a pathological manifestation of the heart. Its pathological changes mainly occur in the sinus node, the pacemaker of the heart. The common causes are coronary heart disease, cardiomyopathy and degenerative diseases of the heart conduction system in the elderly. "Sick sinus" patients heart rate is very slow, sometimes only 30-40 times per minute.

matters needing attention

In short, when the heart rate is too slow, we should mainly consider the main causes such as "hyperactivity", "sick sinus" and severe conduction block. We can also find the cause of the slow heart rate through detailed history and ECG examination, so that we can treat the cause.