What valve disease is associated with an Austin Flint murmur?

The Austin Flint murmur is specifically associated with aortic regurgitation. This murmur occurs when the backflow of blood from the aorta into the left ventricle during diastole leads to a secondary turbulence of blood flow, particularly at the mitral valve area.

In aortic regurgitation, the high volume of blood returning to the left ventricle increases its preload and can also cause the mitral valve to be set in a position that results in a diastolic murmur, perceived as a low-pitched, rumbling sound, often heard best with the patient in the left lateral decubitus position.

This characteristic murmur distinguishes aortic regurgitation from other valvular diseases like aortic stenosis, mitral stenosis, and mitral regurgitation, which may present with different types of murmurs related to their specific pathophysiological mechanisms.