Equine Aortic Insufficiency Murmur

Amara Estrada, DVM, DACVIM (Cardiology) University of Florida

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A decrescendo murmur starting at the time of S2 is appreciated in this equine heart sound; the murmur gradually tapers from the initial peak as it extends through diastole (decrescendo in shape). 

The most common cause of a decrescendo diastolic murmur in older horses is degeneration of the aortic valve, leading to aortic insufficiency. 

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