on August 23, 2007
Published online before print August 23, 2007, doi: 10.1161/ATVBAHA.107.147322
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Submitted on April 30, 2007
Accepted on July 26, 2007
Predictive Value of Reactive Hyperemia for Cardiovascular Events in Patients With Peripheral Arterial Disease Undergoing Vascular Surgery
Alex L. Huang ;
From the Evans Department of Medicine and Whitaker Cardiovascular Institute (A.L.H., A.E.S., E.S., D.W.S., E.J., M.A.T., A.S., M.D., R.T.E., J.F.K., N.G., J.A.V.), Boston University School of Medicine, Boston, Mass; the Department of Surgery (J.O.M.), University of Connecticut Health Center, Farmington; the Department of Surgery (M.T.W.), Massachusetts General Hospital, Boston; and the Department of Surgery (J.D.R., G.G., J.W., P.M.S.), Boston University School of Medicine, Boston, Mass.
* To whom correspondence should be addressed. E-mail: jvita{at}bu.edu.
Objective—Reactive hyperemia is the compensatory increase in blood flow that occurs after a period of tissue ischemia, and this response is blunted in patients with cardiovascular risk factors. The predictive value of reactive hyperemia for cardiovascular events in patients with atherosclerosis and the relative importance of reactive hyperemia compared with other measures of vascular function have not been previously studied.
Methods and Results—We prospectively measured reactive hyperemia and brachial artery flow-mediated dilation by ultrasound in 267 patients with peripheral arterial disease referred for vascular surgery (age 66±11 years, 26% female). Median follow-up was 309 days (range 1 to 730 days). Fifty patients (19%) had an event, including cardiac death (15), myocardial infarction (18), unstable angina (8), congestive heart failure (6), and nonhemorrhagic stroke (3). Patients with an event were older and had lower hyperemic flow velocity (75±39 versus 95±50 cm/s, P=0.009). Patients with an event also had lower flow-mediated dilation (4.5±3.0 versus 6.9±4.6%, P<0.001), and when these 2 measures of vascular function were included in the same Cox proportional hazards model, lower hyperemic flow (OR 2.7, 95% CI 1.2 to 5.9, P=0.018) and lower flow-mediated dilation (OR 4.2, 95% CI: 1.8 to 9.8, P=0.001) both predicted cardiovascular events while adjusting for other risk factors.
Conclusions—Thus, lower reactive hyperemia is associated with increased cardiovascular risk in patients with peripheral arterial disease. Furthermore, flow-mediated dilation and reactive hyperemia incrementally relate to cardiovascular risk, although impaired flow-mediated dilation was the stronger predictor in this population. These findings further support the clinical relevance of vascular function measured in the microvasculature and conduit arteries in the upper extremity.
Key words: endothelium • cardiovascular risk • surrogate markers • reactive hyperemia • flow-mediated dilation
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