The incidence of dyspnea and shortness of breath after bypass surgery is relatively low, mainly due to the following reasons: 1) the wound may be painful after the surgery, which causes the patient to be afraid to breathe; 2) a small number of older patients may have underlying diseases, or have old chronic bronchitis, asthma and other diseases, which lead to dyspnea; 3) a small number of patients develop lung infections after the surgery. All of the above are reasons for the occurrence of asthma and dyspnea, which can be relieved through treatment. And during the treatment period, i.e. during hospitalization, by applying antibiotics, nebulizing means and encouraging patients to cough and expectorate, the uncomfortable symptoms can be recovered as early as possible.