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carotid bruit
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 (though some disagree); however, most carotid bruits, particularly those found in younger or asymptomatic patients, are not related to any disease and are termed "innocent carotid bruits".〔Bates' Guide to Physical Examination and History Taking, 9th Ed, Chapter 20〕 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.
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.〔DeGowin's Diagnostic Examination, 9th Edition, Chapter 8;
Richard F. LeBlond, Donald D. Brown, Richard L. DeGowin〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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