Patients with complete left bundle branch block of the heart are at risk and often have organic heart disease that requires medication or pacemaker implantation. Complete left bundle branch block is generally referred to as complete left bundle branch block of the heart, which is a common arrhythmia, and patients may not have any symptoms, or may show symptoms such as chest tightness, chest pain, palpitations and so on. Complete left bundle branch block often indicates that the patient is suffering from myocardial ischemia, coronary atherosclerotic heart disease, acute infection, rheumatic heart disease and other diseases. After the occurrence of complete left bundle branch block, the ventricle can appear uncoordinated contraction, causing the heart pumping function abnormality and lead to heart failure, manifested as dyspnea, if the treatment is not timely can be due to the body ischemia and hypoxia leading to death. Complete left bundle branch block suggests myocardial ischemia, which can lead to acute myocardial infarction in severe cases. Patients with complete left bundle branch block can be treated with nitroglycerin, aspirin, heparin and other medications as prescribed by the doctor after examination to determine the cause of the block, and implantation of a pacemaker can be considered in case of severe symptoms. When complete left bundle branch conduction occurs, it is important to consult a doctor in time, and after examination and evaluation by a doctor, choose the appropriate treatment to avoid delays.