The auscultation point for the aortic valve is at which interspace?

• A. Right 2nd interspace
• B. Left 2nd interspace
• C. Right 3rd interspace
• D. Left 4th interspace

Answer: (A)

Aortic valve sounds are heard best at the right second intercostal space at the sternal border. This spot, called the aortic area, sits closest to the valve as blood exits the left ventricle into the aorta, so the turbulent flow from the valve is most audible there. The aortic region is typically used to listen for the A2 component of S2 and for murmurs of aortic valve disease.

In contrast, the left second interspace is the pulmonic area (valve associated with the right heart’s counterpart), the left lower sternal border around the 4th–5th interspaces is where tricuspid valve sounds are best heard, and the right third interspace is not a standard primary auscultation site for a valve.