Upon auscultation at the apex, the APRN hears a grade 3 systolic heart murmur that is soft and blowing in character. What does this finding suggest?

Choice A reason: Aortic stenosis typically presents with a systolic ejection murmur heard best at the right upper sternal border with radiation to the neck. It is often harsh rather than soft and blowing. Choice B reason: Mitral valve regurgitation produces a holosystolic, soft, blowing murmur best heard at the apex and radiating to the axilla. A grade 3 murmur is moderately loud without a thrill, consistent with this description. Choice C reason: Tricuspid stenosis produces a diastolic murmur, often heard at the lower left sternal border, sometimes increasing with inspiration. The murmur in this case is systolic and located at the apex, making TS unlikely. Choice D reason: Austin-Flint murmur is a diastolic murmur associated with severe aortic regurgitation and is heard at the apex. The murmur described here is systolic, not diastolic, and therefore does not fit this diagnosis.