(1) To maintain normal or near normal state of blood circulation: a normal heart possesses a very good capacity of compensation and regulation; when the heart rate increases to 180 beats / min, it could continue to increase cardiac output; when the heart rate slow down to 35 beats / min, or even 30 times / time, it also can maintain an adequate cardiac output, maintaining normal blood circulation state to make blood pressure remain at normal or near normal range. However, if pathological changes occur to the heart, when heart functions are abnormal, it lost capacity of compensation and regulation, causing decreased cardiac output, decreased blood pressure and disordered blood circulation. If the atrial contractile function disorders, or atrial and ventricular contraction procedural change, cardiac output can be decreased by about 30%, causing palpitations, chest tightness, weakness and other symptoms on patients.

(2) To reduce or eliminate symptoms: Most patients with arrhythmias have certain symptoms, including palpitations, chest tightness, precordial discomfort, weakness and other symptoms, or even affect the sleeping, work, rest and daily life. If patients can receive timely treatments, above mentioned symptoms relieve or disappear, it is effective to improve the quality of patients' life.

(3) To prevent sudden death: Sudden cardiac death is a common form of death clinically. Among people with heart disease, coronary heart disease comes as the highest sudden death rate, accounting for 80% of sudden cardiac death rate. According to statistics, there are 300,000 to 600,000 people each year in the United States occur sudden cardiac death, accounting for 40% ~ 50% of the total heart disease deaths. Therefore, antiarrhythmic therapy is very necessary, playing a certain role on the prevention of sudden death.

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