Journal
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
Volume 305, Issue 8, Pages H1222-H1229Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpheart.00358.2013
Keywords
coronary disease; ischemia; native coronary artery; saphenous vein graft; vasoconstriction
Funding
- Heinz-Horst Deichmann Foundation
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Stent implantation into atherosclerotic coronary arteries releases particulate debris and soluble substances that contribute to impaired microvascular perfusion. Here we addressed the potential for microvascular obstruction in patients with stenotic native right coronary arteries (nRCA) compared with saphenous vein grafts on right coronary arteries (SVG-RCA). We enrolled symptomatic, male patients with stable angina pectoris and a flow-limiting stenosis in their nRCA or SVG-RCA (n = 18/18). Plaque volume and composition were analyzed using intravascular ultrasound before stent implantation. Coronary aspirate was retrieved during stent implantation under protection with a distal occlusion/aspiration device and divided into particulate debris and plasma. The release of catecholamines, endothelin, serotonin, thromboxane B-2, and tumor necrosis factor-alpha was measured. The response of rat mesenteric arteries with intact (+E) and denuded (-E) endothelium to aspirate plasma (without and with selective endothelin receptor blockade) was normalized to that by potassium chloride (KClmax = 100%). Plaque volume and composition were not different between nRCA and SVG-RCA. There was less particulate debris (65 +/- 8 vs. 146 +/- 23 mg; P < 0.05) and more endothelin release (5.8 +/- 0.8 vs. 1.3 +/- 0.7 pg/ml; P < 0.05) in nRCA than in SVG-RCA, whereas the release of the other mediators was not different. Aspirate from nRCA induced stronger vasoconstriction than that from SVG-RCA [nRCA, 78 +/- 6% (+E)/84 +/- 5% (-E); SVG-RCA, 59 +/- 6% (+E)/68 +/- 3% (-E); P < 0.05 nRCA vs. SVG-RCA], which was attenuated by a nonspecific endothelin and a specific endothelin receptor A antagonist. Thus coronary aspirate from stented nRCA is characterized by less debris but more endothelin and stronger vasoconstrictor response than that from SVG-RCA.
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