After cardiac angiography, patients should be advised to drink more water and urinate more, which can excrete the contrast agent. Because the contrast agent is harmful to the body, after drinking more water and urinating, it can speed up the excretion of the contrast agent and reduce the damage to the body. To take care of the puncture site, the puncture site should be protected from infection, and the patient should not be exposed to water and should not take a bath for 24 hours. To prevent bleeding at the puncture site, patients need to be pressurized for more than 6 hours after surgery. Take the radial artery as an example, the radial artery is usually pressurized with a balloon, which should be deflated every two hours to prevent swelling, numbness and pain in the patient’s hand. Patients should also be advised to rest, lie down as much as possible, not to hold heavy objects, not to move with force, and to avoid large emotional fluctuations, which can reduce the risk of bleeding.