Cardiac arrest clinically known as premature cardiac arrest, premature cardiac arrest is usually due to physiological factors or coronary heart disease, cardiomyopathy, and other pathological factors. 1. Physiological factors: Normal people can induce premature impulses from ectopic pacing points due to mental tension, anxiety, overwork, prolonged late night, excessive smoking, alcohol, strong tea, coffee and other factors, which can cause premature beats. 2. Pathologic factors (1) Organic heart disease: such as coronary heart disease, cardiomyopathy, valvular heart disease, mitral valve prolapse, heart failure and other diseases, can lead to premature heartbeat. (2) Drug factors: it can be seen in the adverse reaction of taking digitalis toxin tablets, quinidine sulfate tablets, clomipramine hydrochloride tablets and other drugs. (3) Electrolyte disorders: common in low potassium, low magnesium and other electrolyte disorders caused by premature heartbeat. (4) Medical factors: cardiac surgery, cardiac catheterization can cause premature heart beats. (5) Others: diseases such as hyperthyroidism and anemia can also cause premature heartbeats. The majority of patients with premature cardiac contractions may have no obvious symptoms, or symptoms such as palpitations, chest tightness, weightlessness and cardiac arrest. Patients should consult a doctor for further examination under the guidance of a physician to clarify the cause of the disease and carry out treatment.