Cardiac surgery patients should keep the discharge summary when they are discharged from the hospital, and should bring the discharge summary and the results of various tests done in other hospitals, such as ECG, X-ray chest film, laboratory tests, etc. for reference when they are reviewed. You can also contact the hospital by letter. The correspondence should include: how much activity you are currently doing (e.g. how many floors you can go up, how many miles you can walk, etc.); what kind of work and physical activities you can do; what symptoms or discomfort you usually have; what you eat and drink; how much you urinate daily; whether you have been to the hospital recently for checkups, and if so, the results of those checkups; what medications you are currently taking, and how much and how to take them; and any other special discomfort you need from the hospital. Any other special discomfort that needs to be answered and assisted by the hospital. Patients who have undergone heart surgery should seek medical review in the following cases 1. Infection in any part of the body. 2.If there is fever of unknown origin. 3.When there is obvious shortness of breath and swelling. 4.Creating foamy blood sputum. 5.When there is bleeding tendency such as subcutaneous bleeding, hematuria, etc. 6.When sclera and peripheral skin appear yellowish. 7.When new arrhythmia occurs. 8. When sudden syncope, hemiparesis or pain in lower limbs, cyanosis or pallor occur.