Anti-heart failure pacemakers (three-chamber pacemakers, or CRT) are mainly used to treat heart failure, the prevalence of which is 1.5-2% in Western countries and 0.9% in Chinese adults, with an estimated total of 5.85 million people with heart failure in China. Currently, the following patients are recommended to be treated with an anti-heart failure pacemaker: 1) ischemic (coronary artery disease, etc.) or non-ischemic (dilated cardiomyopathy, etc.), 2) NYHA III/IV despite adequate anti-heart failure medication (those who do not need to be bedridden), 3) sinus rhythm, 4) ejection fraction (EF) <35%, 5) left ventricular end-diastolic diameter (LVEDD) >55 mm, 6) QRS wave width 6. QRS wave width >120 mm, with cardiac motion asynchrony. At present, with the continuous medical research, for patients with heart failure NYHA less than III/ IV, patients with chronic atrial fibrillation, patients with organic heart disease meeting the indications for conventional cardiac pacing with ventricular pacing or those with cardiac function class III and above, conventional cardiac pacing with ventricular pacing dependence, heart enlargement after pacing therapy, cardiac function class III or above, QRS <120 ms and meeting the indications for class I Other conditions for the indications, echocardiography or tissue Doppler (TDI), if any two of the following asynchronous conditions are met: 1) aortic pre-ejection time >140 ms, 2) left interventricular mechanical delay >40 ms, 3) left ventricular posterior lateral wall excitation delay. A benefit can still be obtained with the implantation of an anti-heart failure pacemaker. Procedure: The left subclavian vein is punctured under local anesthesia, and the left ventricular electrode is first placed into the left ventricular branch of the coronary sinus (lateral or posterior left ventricular branch) according to the coronary sinus angiography. After satisfactory testing of the pacemaker, the pulse generator is placed in a subcutaneous bag on the chest, the surgical incision is sutured, and a local pressure dressing is applied. In view of this, your ultrasound report and other information will be reported in detail to your doctor for judgment.