Severe aortic stenosis is caused by lesions that result in junctional adhesions, thickening and stiffening of the valve leaflets, and restricted opening of the aortic valve due to reduced mobility, which does not open properly. The patient presents with restricted blood flow from the left ventricle through the aortic valve to the aorta and decreased blood flow. However, in order to maintain normal physiological needs, the left ventricle of the heart prolongs and increases work to make a certain amount of blood ejected into the aorta. Therefore, there is a significant thickening of the left ventricular myocardium and a significant increase in contraction, which increases the work done by the heart and increases the oxygen consumption of the heart, and the patient will experience the corresponding symptoms and the heart function will be significantly affected.