Carotid bruit

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Carotid bruit
Carotid bruit in a gentleman with a 70% stenosis of his left carotid artery.
ICD-10 R01.1
ICD-9 785.9
DiseasesDB 29151

A carotid bruit is a systolic sound heard over the carotid artery area during auscultation.

Associated conditions

It may occur as the result of carotid artery stenosis[1] (though some disagree)[2]; however, most carotid bruits, particularly those found in younger or asymptomatic patients, are not related to any disease and are termed "innocent carotid bruits".[3] A carotid bruit is unlikely to be heard if the stenosis occludes less than 40% of the diameter of the artery. Likewise, a stenosis of greater than 90% may not be heard, as the flow may be too low.[citation needed]

Many carotid bruits are discovered incidentally in an otherwise asymptomatic patient. The presence of a carotid bruit alone does not necessarily indicate the presence of stenosis, and the physical examination cannot be used to estimate the degree of stenosis, if present; therefore, any bruit must be evaluated by ultrasound or imaging.[4]

Pronunciation and terminology

Bruit is properly pronounced broot, rhyming with boot, but is more often pronounced as bru´e or bru-e´ in U.S. medical parlance.[5] In addition, while bruit and murmur are technically synonymous, the term bruit is generally reserved for arterial sounds in the U.S.[4]

References

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  3. Bates' Guide to Physical Examination and History Taking, 9th Ed, Chapter 20
  4. 4.0 4.1 DeGowin's Diagnostic Examination, 9th Edition, Chapter 8; Richard F. LeBlond, Donald D. Brown, Richard L. DeGowin
  5. Stedman's Medical Dictionary - 28th Ed.