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A physician concerned about a murmur due to regurgitation of blood through the tricuspid valve would best hear the murmur at which of the following sites?

A. At the sternal notch immediately above the sternum
B. Between the second and third ribs immediately left of the sternum
C. Between the second and third ribs immediately right of the sternum
D. Four inches to the left of the bottom of the sternum
E. Immediately beside the left side of the bottom of the sternum

So Kaplan says that you hear murmurs best downstream of the blood flow. By that logic you should hear tricuspid regurg best in the Right Atrium. So on a surface projection of the heart, the right atrium is to the right of the sternum. So wouldn't the answer be C? (The answer is E) Can someone explain why???

Thanks
 
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