<prompt> The most common complication of Sub-valvular Aortic Stenosis is -Aortic RegurgitationMitral RegurgitationTricuspid RegurgitationPulmonary Regurgitation  <response>: Ans. is a i.e., Aortic Regurgitation o Aortic regurgitation is the most common complication of subaortic stenosis.o Note that Aortic regurgitation is not a congenital anomaly associated with subvalvular aortic stenosis. Aortic regurgitation is a complication of subvalvular The aortic regurgitation appears to be due to thick fibrous tissue on the left ventricular swface of the valve leaflets. The fibrosis is caused by the repetitive trauma from a jet of blood through the stenosis or by the proliferation of the fbroelastic membrane itself. 