http://thedailymedical.com/2009/01/19/physical-findings-of-aortic-regurgitaion.aspx

There are many signs of aortic regurgitation or insufficiency that can be present during physical examination and direct us to the diagnosis. A patient with aortic valve insufficiency will present a diastolic decresendo murmur, best heard at the left sternal border. If the regurgitation is severe enough to cause obstruction of the mitral valve area during diastole then the Austin Flint murmur may be present. This is a diastolic murmur heard over the mitral valve area due to obstruction of the mitral valve orifice. The Corrigan’s pulse or water hammer pulse is the result of the acute decreased in pressure during the late systole and early diastole, can be palpated at the radial and femoral area. De Musset’s (head bobbing) and Duroziez’s  (pistol-shot sound over femoral area) signs are the result of the markedly increased in pressure during early systole follow by a decreased in pressure during late systole and late diastole.