Tachycardia is a relatively common occurrence in patients after valve replacement surgery, but there are many different causes. Therefore, different treatment plans should be adopted for different causes. For example, if the tachycardia is due to volume, it is important to actively replenish the blood volume and adjust the volume of blood circulating in the heart. If the tachycardia is caused by electrolytes, the electrolyte disorder should be corrected. If the tachycardia is caused by other stresses or hyperthyroidism, different symptomatic treatments should be taken. Therefore, for different causes of tachycardia, it is important not to simply use drugs to lower the heart rate, but to treat the cause differently than the symptom. Some tachycardias are caused by the fact that the heart function has not been fully recovered after surgery, so the patient shows a fast heart rate at this time. In such patients, it is necessary to improve the heart function and use digitalis drugs. In general, after the occurrence of tachycardia, patients should not be nervous and should communicate with the doctor in time to find out the cause of tachycardia and take different treatment plans to get better treatment results.