A tachycardia consisting of more than 3-5 broad abnormal QRS waves originating below the bifurcation of the bundle of Hirschsprung is called ventricular tachycardia. The cause of tachycardia is actually the heart rate is too fast, how a fast method, the data said that the normal adult heart rate per minute is 60-100/minute, if more than 100 times is called tachycardia. The causes of tachycardia can be divided into physiological and pathological according to the cause. Physiological This is a very common cause of tachycardia, and the heart rhythm is usually accelerated when running, drinking alcohol, heavy physical labor and emotional stress. There are also many other factors that affect the heart rate, such as change of body position, physical activity, food digestion, emotional anxiety, excitement, fear, excitement, smoking, tea drinking, etc., which can increase the heart rate. Pathological This can be caused by diseases such as hyperthermia, anemia, hyperthyroidism, bleeding, pain, hypoxia, heart failure, and cardiomyopathy. There are two types of tachycardia: ventricular tachycardia and atrial tachycardia, depending on the location of the tachycardia. Ventricular tachycardia is a rapid heartbeat that originates in the ventricles. This can affect the ability of the heart to pump enough blood to the brain and other vital organs. The causes of tachycardia are: 1. in mild cases, there may be no conscious symptoms or only palpitations, chest tightness, weakness, dizziness, sweating; 2. in severe cases, cyanosis, shortness of breath, syncope, hypotension, shock, acute heart failure, angina pectoris, or even sudden death due to ventricular fibrillation; 3. a fast and slightly irregular rhythm, with a heart rate of 120-200 beats per minute, the intensity of the first heart sound in the apical region The intensity of the first heart sound in the apical region varies, and there may be splitting of the first heart sound, and the jugular venous pulsation may be inconsistent with the heart beat, occasionally “cannon wave” can be seen; 4.