Patient: My mother had heart bypass surgery at People’s Hospital on December 23. The leg where the vein was taken is swollen and the top of the foot is swollen. She has elevated that leg when she sits and lies down. Dr. Liu you mentioned in your published article that wearing compression stockings helps to eliminate swelling and improve muscle tone in the lower limbs. Can you please tell us specifically what kind of compression stockings and where to buy them. Liu Gang, Department of Cardiac Surgery, Peking University People’s Hospital, Beijing, China: We should pay attention to several points when dealing with the swelling of the affected limb on the side of the coronary artery bypass graft: First, elevate the affected limb as much as possible at night or in bed during the day (you can put a pillow on it), so as to promote blood flow back to the affected limb; second, pay attention to the daily urine volume, if the urine volume is too small, it will aggravate the swelling of the affected limb, and the daily urine volume should be more than 1000 ml; third, you can wear elastic stockings. Third, you can wear elastic socks, the size of which varies from person to person, and they are sold in the vascular department of our hospital.