The reason for not getting out of bed for up to 24 hours after an angiogram is to avoid breakage of the vessel wall at the puncture site, blood leakage, dislodgment of the blood clot, and re-bleeding. Angiography is usually performed at the root of the thigh under local anesthesia, using a fine needle to insert the blood vessel, allowing the guidewire to be inserted into the artery through the fine needle, and after reaching the location to be imaged, the catheter is guided through the guidewire to the location, releasing the contrast agent so that it can be visualized under the instrument. After removing the catheter and guidewire, it is necessary to apply pressure to stop the bleeding for more than 10 minutes, and then use a bandage to apply pressure to the wound. At this point, a blood clot has formed at the wound, but the arterial blood flow is fast and the pressure is high, so if the body moves, the clot will fall off and the puncture may break and bleed again. Intravascular blood will seep out through the broken vessel wall and form a hematoma. Therefore, generally after angiography, the limb on which the patient received the puncture should be kept in an extended position for 4 hours, and the pressure bandage should be removed after 4 hours to avoid puncture wound breakage and bleeding. The patient should stay in bed quietly for 24 hours after the procedure and observe the wound for bleeding or hematoma to prevent accidents. If there is any postoperative discomfort, it is recommended to inform the doctor as soon as possible.