There are many causes of death in patients with rheumatic heart valve disease, such as heart failure, cardiac arrest, rheumatic heart disease accompanied by atrial fibrillation, etc., as follows: 1. Heart failure: If the patient is not treated by surgical valve replacement surgery, and death occurs during treatment with drugs alone, the greatest possibility is to die from heart failure caused by rheumatic heart disease itself. The most common cause of sudden cardiac death is malignant arrhythmia, such as ventricular fibrillation, cardiac arrest. 2, cardiac arrest, etc.: If death occurs during surgery for rheumatic heart disease, it is generally cardiac arrest or surgery that causes 3, rheumatic heart disease accompanied by atrial fibrillation: it is possible that rheumatic heart disease accompanied by atrial fibrillation, embolism to the brain caused by the death.