Last December, I saw a female patient, 62 years old, on the ward with chest tightness and shortness of breath for more than 1 year, aggravated for 4 days. Her medical history included left heart insufficiency (she had awakened with suffocation at night) and pulmonary infection. On physical examination at the time of arrival, both lungs were full of croup and the heart murmur was not obvious. Several ultrasounds suggested mitral valve insufficiency, ranging from severe to moderate, but all suggested uncoordinated left ventricular wall motion and low ejection fraction. The electrocardiogram suggested complete left bundle branch conduction block. The chest radiograph was unremarkable. Coronary angiography showed anterior descending branch plaque. After analyzing and reviewing the data, I suspected that the mitral regurgitation was caused by arrhythmia rather than a lesion of the valve itself, and repeated the ultrasound to indicate moderate mitral regurgitation, EF 40%, and uncoordinated left ventricular wall motion. The MRI suggested that mitral regurgitation was mild, and the abnormal ventricular wall motion was considered to be caused by complete left bundle branch conduction block. Therefore, it was concluded that complete left bundle branch conduction block led to poor ventricular wall motion and mitral regurgitation, so surgery could not solve the problem and cardiac synchronization therapy should be performed. After consultation with an electrophysiologist, the same conclusion as mine was reached, and after evaluating all aspects of the patient’s condition, pacemaker implantation was performed, and the patient’s cardiac motion was coordinated and cardiac function improved after surgery. I learned a lot from this example. There is no end to learning, and this is especially true for doctors, who have to master more knowledge and apply it skillfully to make accurate judgments. As a cardiac surgeon, it is also important to have a medical perspective. Take the above patient as an example, the essence of her disease is arrhythmia, what is complete left bundle branch block? In layman’s terms, this means that the right ventricle contracts first and the left ventricle contracts later, and the contraction of each part of the left ventricle is also not synchronized, which causes the mitral valve, a parachute-like structure, to fail to tighten at the same time, resulting in poor alignment and regurgitation. I should always encourage myself with this case!