The Austin Flint murmur (AF) is a mid-diastolic murmur secondary to severe aortic regurgitation (AR). Because it is best heard at the apex of the heart, it can be mistaken for mitral stenosis (MS). While the etiology of AF is not completely understood, it is agreed that AF is not due to functional MS. Commonly accepted mechanisms for AF include turbulent flow, mitral valve fluttering, and septal bulging. While often found in asymptomatic patients, AF can indicate severe AR.
KeywordsAustin Flint murmur Severe aortic regurgitation Mid-diastolic murmur
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