Indicators of moderate aortic regurgitation: jet width of 25-65% of the left ventricular outflow tract, regurgitant volume of 30-59 ml, regurgitant fraction of 30-49%, and flow bundle width of 0.3-0.6 cm. The aorta is a large blood vessel in the body that connects to the left ventricle. When left ventricular enlargement, congenital anomalies of the aortic valve, dilated aortic annulus, rheumatic heart disease, or endocardial infections occur, they can lead to the creation of aortic valve closure insufficiency, which can lead to the emergence of aortic regurgitation. When there is only a small amount of regurgitation in the aorta, it usually does not cause symptoms and has little effect on the body. However, if there is more than moderate regurgitation, the aortic valve should be actively controlled, and timely medical treatment should be sought to prevent the gradual aggravation of aortic valve insufficiency, which can lead to ventricular enlargement, heart failure, and other conditions.