Brachial Artery Constriction during Brachial Artery Reactivity Testing Predicts Major Adverse Clinical Outcomes in Women with Suspected Myocardial Ischemia: Results from the NHLBI-Sponsored Women’s Ischemia Syndrome Evaluation WReportar como inadecuado




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Background

Limited brachial artery BA flow-mediated dilation during brachial artery reactivity testing BART has been linked to increased cardiovascular risk. We report on the phenomenon of BA constriction BAC following hyperemia.

Objectives

To determine whether BAC predicts adverse CV outcomes and-or mortality in the women’s ischemic Syndrome Evaluation Study WISE. Further, as a secondary objective we sought to determine the risk factors associated with BAC.

Methods

We performed BART on 377 women with chest pain referred for coronary angiography and followed for a median of 9.5 years. Forearm ischemia was induced with 4 minutes occlusion by a cuff placed distal to the BA and inflated to 40mm Hg > systolic pressure. BAC was defined as >4.8% artery constriction following release of the cuff. The main outcome was major adverse events MACE including all-cause mortality, non-fatal MI, non-fatal stroke, or hospitalization for heart failure.

Results

BA diameter change ranged from -20.6% to +44.9%, and 41 11% women experienced BAC. Obstructive CAD and traditional CAD risk factors were not predictive of BAC. Overall, 39% of women with BAC experienced MACE vs. 22% without BAC p=0.004. In multivariate Cox proportional hazards regression, BAC was a significant independent predictor of MACE p=0.018 when adjusting for obstructive CAD and traditional risk factors.

Conclusions

BAC predicts almost double the risk for major adverse events compared to patients without BAC. This risk was not accounted for by CAD or traditional risk factors. The novel risk marker of BAC requires further investigation in women.



Autor: Tara L. Sedlak , B. Delia Johnson , Carl J. Pepine, Steven E. Reis, C. Noel Bairey Merz

Fuente: http://plos.srce.hr/



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