AIM: @entity450 ( @entity450 ) of the brachial artery measures the ability of the artery to dilate after a @entity63 lasting for 5 min. During @entity63 , and therefore in conditions of low flow, constriction of the brachial artery (L-FMC) has sometimes been reported. The meaning of L-FMC is still unclear. The aims of our study were to establish the prevalence of subjects with L-FMC, to determine whether the magnitude of L-FMC correlates with magnitude of @entity450 , and to determine whether L-FMC can be used to predict @entity450 timing. METHODS: A total of 179 outpatients were studied, and the brachial artery diameter was measured every minute during the 5 min @entity63 . Subjects who had at least one measurement showing a constriction of    1% during @entity63 were defined as constrictors. @entity450 was evaluated at 50 s, 2 min, and 3 min after cuff release. On the basis of time, the subjects in whom maximal dilation had occurred were divided into Early, Late, or No dilators. RESULTS: The brachial artery diameter of 70 subjects (39%) constricted during @entity63 . Higher the constriction during @entity63 , lower was the dilation after @entity63 . Constrictors were more likely to have Late (OR 2.6; ICs 95% 1.19-5.81, p=0.02) or No dilation (OR 4.8; ICs 95% 1.90-12-16, p=0.02) compared with no constrictors. CONCLUSIONS: The present study reveals that almost 40% of the subjects had brachial artery L-FMC and a more pronounced constriction during @entity63 correlated with a @entity384 after @entity63 . Finally, the prevalence of subjects showing L-FMC was significantly higher among subjects with delayed or no vasodilation, suggesting that L-FMC may be a marker of @entity409 .

Brachial Low-Flow-Mediated Constriction is Associated with Delayed XXXX .

@entity384 :: ('MESH:D002311', 'Disease') :: ['lower dilation'] @entity409 :: ('MESH:D008107', 'Disease') :: ['endothelial dysfunction'] @entity450 :: ('MESH:D006940', 'Disease') :: ['FMD', 'Flow-mediated vasodilation'] @entity63 :: ('MESH:D007511', 'Disease') :: ['forearm ischemia', 'ischemia']
@entity384 :: (MESH:D002311,Disease) :: ['Brachial Flow-Mediated Dilation']
