Left heart function is mainly to determine the left ventricular function, which can be clarified by left heart catheterization and selective coronary angiography and other tests to determine whether the ventricular wall motion is normal, with or without valvular closure insufficiency, aortic and subclavian artery diseases. If the left heart insufficiency is very easy to develop symptoms of left heart failure, such as panic, chest tightness, wheezing after activity, pink foamy sputum, exertional dyspnea, nocturnal paroxysmal dyspnea, sedentary breathing and other discomforts. Timely administration of drugs to reduce the anterior and posterior cardiac load, diuretic and decongestant, dilate coronary circulation, improve myocardial blood supply, and improve cardiac circulation, such as furosemide, metoprolol tartrate, enalapril, and chuanxiongxiongzine, etc., is needed.