Base Right: Ejection Sound
Ejection sounds are high frequency "clicky" sounds occuring shortly after the first sound with the onset of ventricular ejection. They are produced by the opening of the semilunar valves (aortic or pulmonic) either when one of these valves is diseased or when ejection is rapid through a normal valve. They are heard best at the base and may be of either aortic or pulmonic origin.
Ejection sounds of aortic origin are heard anywhere on a straight line from base right (where they are best heard) to the apex. Aortic ejection sounds are heard in patients with valvular aortic stenosis, aortic insufficiency, coarctation of the aorta, or aneurysm of the ascending aorta.
The sound you heard is from a patient with mild aortic stenosis.