Which assessment finding is most characteristic of a client with aortic valve regurgitation?

Aortic valve regurgitation (also called aortic insufficiency) causes blood to flow backward from the aorta into the left ventricle during diastole, creating a characteristic hemodynamic pattern. The hallmark finding is a water-hammer pulse, also called Corrigan's pulse — a bounding, forceful pulse with a rapid upstroke and sudden collapse. This occurs because during systole, the left ventricle ejects a large stroke volume into the aorta (causing a forceful rise in pulse), but blood then leaks back through the incompetent valve during diastole, causing a rapid fall in diastolic pressure. This results in a widened pulse pressure, not a narrow one. A narrow pulse pressure is more characteristic of aortic stenosis, where stroke volume is reduced. Weak peripheral pulses are also inconsistent with aortic regurgitation; the bounding, hyperdynamic circulation produces strong, not weak, peripheral pulses. Jugular venous distension reflects elevated right-sided or central venous pressure and is more associated with right heart failure, tricuspid disease, or cardiac tamponade. In aortic regurgitation, the pathology is primarily left-sided until late-stage disease. The water-hammer pulse, widened pulse pressure, and the associated clinical signs such as de Musset's sign (head bobbing) and Quincke's sign (pulsating nail beds) are classic findings students must know.