Sinus bradycardia, clinically known as sinus bradycardia, is a condition in which the heart is paced from the sinus node, but the heart beats at a slow rhythm of less than 60 beats per minute. Sinus bradycardia can occur in a physiological state, or it can be caused by various pathological factors that need to be analyzed on a case-by-case basis.1. Physiological factors: Sinus bradycardia can occur in athletes, the elderly, heavy laborers, and when the body is asleep. Under normal circumstances, sinus bradycardia does not affect cardiac output, nor does it affect the perfusion of important organs, and there are no symptoms, so this kind of sinus bradycardia does not need to be dealt with; 2, pathological factors: such as acute myocardial infarction, severe electrolyte disorders, severe renal insufficiency or taking excessive heart rate slowing drugs, such as digoxin poisoning, or the patient’s own conduction system dysfunction appears pathological sinus node The patient may have severe sinus bradycardia. If patients experience chest tightness, weakness, dizziness, or even syncope, sinus bradycardia should be treated aggressively by implanting a temporary pacemaker and removing the causes of sinus bradycardia. In some patients, sinus bradycardia may disappear and normal sinus rhythm may be restored after the cause is removed, in which case the temporary pacemaker can be removed. However, if the patient’s severe sinus bradycardia does not return, a permanent pacemaker should be considered for treatment.