The tightness of breath two years after heart blockage may be caused by autonomic dysfunction, heart disease, mediastinal lesions, etc. Patients should go to the hospital in time for examination to clarify the specific situation and be treated under the guidance of the doctor. 1. Autonomic dysfunction: some patients’ chest tightness after heart block surgery may be caused by autonomic dysfunction, such patients need to clarify the cause of autonomic dysfunction and carry out causative treatment at an early stage, usually pay attention to relaxation, and can take methylcobalamin, vitamin B and other adjuvant treatments according to the doctor’s instructions. 2. Heart disease: if the patient has other heart disease, it can also cause chest tightness, the patient needs to go to the hospital in time to check and make sure the cause of chest tightness, and then go to the hospital for active treatment. 3. Mediastinal lesions: mediastinal tumors and other mediastinal lesions can easily compress local blood vessels and lead to chest tightness and stuffiness, patients can go to the hospital to have the tumor removed after clear diagnosis. Cardioplegia is a kind of treatment for congenital heart disease, which uses umbrella-like material to block the defective part, so that the patient’s body can form a blood circulation similar to that of normal people. If the patient’s breath is a little bit tight for two years after cardioplegia, it is recommended to consult a doctor in time to find out the reason.