Thread: About Gallavardin phenomenon

When I learn aortic stenosis, I met Gallavardin phenomenon, But I don't find out it's mechanism. Somebody can tell me about that. Thanks

The Gallavardin phenomenon is a clinical sign found in patients with aortic stenosis. It is described as the dissociation between the noisy and musical components of the systolic murmur heard in aortic stenosis. The harsh noisy component is best heard at the upper right sternal border radiating to the neck due to the high velocity jet in the ascending aorta. The musical high frequency component is best heard at the cardiac apex.The presence of a murmur at the apex can be misinterpreted as mitral regurgitation. However, the apical murmur of the Gallavardin phenomenon does not radiate to the left axilla and is accentuated by a slowing of the heart rate (such as a compensatory pause after a premature beat) whereas the mitral regurgitation murmur does not change.

The sign is named after Louis Gallavardin, having been described by Gallavardin and Ravault in 1925.

I'll post animation/audio later if u dont understand yet.

Originally Posted by vitrag24

The Gallavardin phenomenon is a clinical sign found in patients with aortic stenosis. It is described as the dissociation between the noisy and musical components of the systolic murmur heard in aortic stenosis. The harsh noisy component is best heard at the upper right sternal border radiating to the neck due to the high velocity jet in the ascending aorta. The musical high frequency component is best heard at the cardiac apex.The presence of a murmur at the apex can be misinterpreted as mitral regurgitation. However, the apical murmur of the Gallavardin phenomenon does not radiate to the left axilla and is accentuated by a slowing of the heart rate (such as a compensatory pause after a premature beat) whereas the mitral regurgitation murmur does not change.

The sign is named after Louis Gallavardin, having been described by Gallavardin and Ravault in 1925.

I'll post animation/audio later if u dont understand yet.

Sorry, but maybe you misunderstand, I want to know mechanism in which phenomenon was generated, not what phenomenon is talk about. Because I read a document, which state possible mechanism, and here is link :
Arch Intern Med -- Excerpt: Gallavardin Phenomenon in Aortic Stenosis: A Possible Mechanism, October 1974, Giles et al. 134 (4): 747

But the article is too old, so i just want to know Gallavardin's mechanism at the present.

hey vitrag, direct copy paste from Wikipedia !!!!!!!

pitch of murmur depends upon gradient and flow:
flow dependent murmurs are usually low pitch and gradient dependent are high pitch,
like murmur of MR operates at very high gradient and so high pitch while MS is flow dependent and low pitch.
in AS ventricle ejects more flow at high gradient so mix frequency present,
high pitch waves travel better like female sound!!!and can be heard at distnce,same is here