Open heart surgery for aortic valve stenosis is the surgical opening of the chest to replace the aortic valve. It includes steps such as opening the chest, extracorporeal circulation, valve replacement, and closing the chest. 1. Chest opening: the surgeon makes preoperative preparations, sterilizes and spreads the towel, then cuts the sternum and exposes the heart. After exposing the heart, cannulation is performed in the aorta and vena cava. 2. Extracorporeal circulation: After the aorta and vena cava are intubated, the blood of the whole body is drained from the vena cava to the artificial heart-lung machine, and then returned to the ascending aorta after oxygenation to satisfy the blood supply of the organs of the whole body. 3. Valve replacement: During extracorporeal circulation, the heart stops beating, so the stenotic valve can be replaced. 4. Chest closure: After the above operations, blood flow to the heart is restored and the heart will start beating again, followed by gradual closure of the chest cavity. Open heart surgery for aortic stenosis is recommended to be performed according to the doctor’s instructions.