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Abstracts |

Phonocardiographic Differentiation Between Aortic and Pulmonic Insufficiency.

Robert H. Schwab, M.D.; and John H. Killough, M.D., F.A.C.P.
Ann Intern Med. 1964;60(4):712. doi:10.7326/0003-4819-60-4-712_2
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Patients presenting with high-pitched diastolic decrescendo murmurs along the left sternal border may have insufficiency of either the pulmonic or aortic valve. Theoretically, using phonocardiography, one should be able to ascertain which semilunar valve gives rise to the murmur by observing the relationship of the diastolic murmur to the aortic and pulmonic components of the second heart sound. If the diastolic murmur begins immediately with the aortic component, the aortic valve is the insufficient valve. However, if there is a relatively silent interlude between the aortic and pulmonic components of the second sound the murmur starts immediately with, or within


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