Heart rate 40 beats/min normal?

If the heart rate is 40 beats/min, it needs to be analyzed and judged according to the specific situation.

When athletes carry out high-intensity exercise for a long time, it can cause myocardial thickening and strengthen the calcification and contraction ability of the heart. The heart rate of 40 beats/min may occur. If there is no cardiac discomfort, it is a normal phenomenon. If physiological factors are excluded, the patient's heart rate remains 40 beats/min, and chest distress, palpitation, shortness of breath, dizziness, amaurosis and other symptoms exist at the same time, it belongs to abnormal conditions, which may be related to hypothyroidism, high atrioventricular block and other factors, and further examination and treatment are required.