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• W2158602005 abstract "Hypertensive patients with angiographically normal coronary arteries may have myocardial ischemia when metabolic demand increases. Abnormal epicardial coronary artery vasomotion in response to sympathetic stimulation may contribute to ischemia in such patients. We studied the vasomotor response of smooth coronary arteries to a cold pressor test in 10 hypertensive patients without other risk factors and in 9 control subjects. Vessel dimensions were measured by quantitative angiography, and blood flow was calculated using an intracoronary Doppler catheter in the left anterior descending coronary artery. In response to cold pressor stimulation, arteries of control subjects dilated 13.0 +/- 5.9% (P < .001), and they constricted 8.2 +/- 8.5% in hypertensive patients (P < .001). Rate-pressure product increased from 9466 +/- 1677 to 12,547 +/- 2367 beats per minute (bpm).mm Hg in control subjects (P < .001) and from 13,720 +/- 1823 to 17,353 +/- 2037 bpm.mm Hg in hypertensive patients (P < .001). Coronary blood flow velocity and blood flow increased 51 +/- 26% (P < .05) and 87 +/- 27% (P < .001), respectively, in control subjects and 68 +/- 52% (P < .05) and 36 +/- 33% (P < .01) in hypertensive patients. At peak cold pressor test, despite a significant higher rate-pressure product in hypertensive patients, blood flow was similar in both groups, suggesting an uncoupling between myocardial metabolic demand and supply. Thus, hypertension impairs the vasodilator response of angiographically normal coronary arteries to a cold pressor test. This abnormal response may be due to enhanced catecholamine reactivity and/or impairment of endothelial flow-mediated vasodilator response." @default.
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• W2158602005 date "1994-08-01" @default.
• W2158602005 modified "2023-10-16" @default.
• W2158602005 title "Coronary artery constriction caused by the cold pressor test in human hypertension." @default.
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• W2158602005 doi "https://doi.org/10.1161/01.hyp.24.2.212" @default.
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