S2(redirected from S2 (disambiguation))
Symbol for second heart sound.
the second heart sound in the cardiac cycle. It is associated with closure of the aortic and pulmonic valves at the outset of ventricular diastole. The second sound is louder and shorter than the first. The sound of the aortic valve is loudest on the right sternal border, and that of the pulmonic valve is most distinct on the left sternal border over the second intercostal space.
S2Cardiology The 2nd heart sound, which corresponds to the closure of semilunar–pulmonary and aortic valves, which is a short, higher pitched “dubb”.
Abbreviation for second heart sound.