Whether the heartbeat is more than 40 dangerous need to be combined with the actual situation of the patient to see, if the ordinary exercise, night heartbeat 40 times / min is generally not a big problem, otherwise it is more dangerous.
The normal heart rate is 60~100 beats/min, which is related to the patient’s physical condition, the state at that time and other factors, but it will not be lower than 60 beats/min.
People who exercise a lot, such as professional track and field athletes, due to the long time of sports training, myocardial strength, in the resting state, the heart rate will be lower than normal, the night sleep heart rate of 40 beats / min may also belong to the normal situation.
However, if the physical quality of the ordinary poor or in the daytime normal activity state heart rate also frequently fall to 40 times / min, it is more dangerous to consider for ventricular rhythm, severe atrioventricular block and other arrhythmic diseases, may cause each organ blood supply is insufficient, dizziness, blackout, fatigue, chest tightness and other symptoms.
Therefore, whether the heart rate of 40 beats/minute is dangerous or not should be analyzed in the light of the actual situation of the patient, and it is recommended to consult a doctor in a timely manner, improve the dynamic electrocardiogram and other related examinations, and carry out treatment under the guidance of the doctor, so as to avoid delays in the condition.