In auscultating the precordium of a patient, you hear a high-pitched "whooshing" noise occurring simultaneously with S₁. This finding is most consistent with which of the following?

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Systolic murmurs are produced by an incompetent atrioventricular (AV) valve or a stenotic semilunar valve. An incompetent AV valve allows a backflow of blood into the atrium, usually producing a high-pitched "whooshing" noise simultaneously with S₁.

In Auscultating the Precordium of a Patient, You Hear a High-Pitched