Upon auscultation, the nurse hears a whooshing sound at the fifth intercostal space. The nurse recognizes that this sound is
a. The beginning of the systolic phase.
b. The opening of the aortic valve.
c. S3, the third heart sound.
d. Regurgitation of the mitral valve.
ANS: D
A whooshing sound at the fifth intercostal space is a murmur; a prolapsed valve allows regurgitation that is heard as a whooshing sound. The systolic phase begins with ventricular filling and closing of the aortic valve, which is heard as the first heart sound, S1. The third heart sound, S3, is heard with heart failure.
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