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Endothelial and non-endothelial coronary blood flow reserve and left ventricular dysfunction in systemic hypertension. | LitMetric
Objectives : We evaluated the impairment of endothelium-dependent and endothelium-independent coronary blood flow reserve after administration of intracoronary acetylcholine and adenosine, and its association with hypertensive cardiac disease.Introduction : Coronary blood flow reserve reduction has been proposed as a mechanism for the progression of compensated left ventricular hypertrophy to ventricular dysfunction.Methods : Eighteen hypertensive patients with normal epicardial coronary arteries on angiography were divided into two groups according to left ventricular fractional shortening (FS). Group 1 (FS > or =0.25): n=8, FS=0.29 +/- 0.03; Group 2 (FS <0.25): n=10, FS= 0.17 +/- 0.03.Results : Baseline coronary blood flow was similar in both groups (Group 1: 80.15 +/- 26.41 mL/min, Group 2: 100.09 +/- 21.51 mL/min, p=NS). In response to adenosine, coronary blood flow increased to 265.1 +/- 100.2 mL/min in Group 1 and to 300.8 +/- 113.6 mL/min (p <0.05) in Group 2. Endothelium-independent coronary blood flow reserve was similar in both groups (Group 1: 3.31 +/- 0.68 and Group 2: 2.97 +/- 0.80, p=NS). In response to acetylcholine, coronary blood flow increased to 156.08 +/- 36.79 mL/min in Group 1 and to 177.8 +/- 83.6 mL/min in Group 2 (p <0.05). Endothelium-dependent coronary blood flow reserve was similar in the two groups (Group 1: 2.08 +/- 0.74 and group Group 2: 1.76 +/- 0.61, p=NS). Peak acetylcholine/peak adenosine coronary blood flow response (Group 1: 0.65 +/- 0.27 and Group 2: 0.60 +/- 0.17) and minimal coronary vascular resistance (Group 1: 0.48 +/- 0.21 mmHg/mL/min and Group 2: 0.34 +/- 0.12 mmHg/mL/min) were similar in both groups (p= NS). Casual diastolic blood pressure and end-systolic left ventricular stress were independently associated with FS.Conclusions : In our hypertensive patients, endothelium-dependent and endothelium-independent coronary blood flow reserve vasodilator administrations had similar effects in patients with either normal or decreased left ventricular systolic function.
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