Bradycardia is defined as a heart rate of less than 60 beats per minute, and can be treated with drugs such as atropine or isoprenaline, but long-term use is often uncertain and prone to serious side effects, so cardiac pacing therapy should be considered. Physiologic bradycardia and asymptomatic sinus bradycardia usually do not require treatment. If the symptoms of insufficient cardiac output occur due to slow heart rate, drugs such as atropine or isoproterenol can be applied, but the effect of long-term application is often uncertain, and serious side effects are likely to occur, so cardiac pacing therapy should be considered. 1. Atropine: It can be used for slow arrhythmias such as sinus block and atrioventricular block caused by vagal hyperexcitability, and also for ventricular ectopic nodes secondary to sinus node hypofunction. For antiarrhythmic use, adults should receive 0.5-1 mg intravenously, once every 1-2 hours as needed, with a maximum of 2 mg. 2. Isoprenaline: Used in the treatment of cardiogenic or infectious shock, treatment of complete atrioventricular block, cardiac arrest. Common adverse reactions include: dryness of mouth and throat, palpitations and restlessness; rare adverse reactions include: dizziness, dizziness, flushing, nausea, increased heart rate, tremor, excessive sweating, and fatigue. Angina pectoris, myocardial infarction, hyperthyroidism and pheochromocytoma patients are prohibited. 3. Pacing therapy: Because the long-term application of drug therapy is often uncertain, some patients are prone to serious side effects, so if necessary, cardiac pacing therapy can be considered. Patients with bradycardia are advised to seek medical advice in time, and the medication should be used according to the doctor’s instructions.