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- W2072023215 abstract "In order to examine the effects of Escherichia coli endotoxemia on coronary and pulmonary microvascular responses to serotonin (5-HT) and ADP, arterioles (80-190 micros diameter) were isolated from pigs 3 h after administration of E. coli endotoxin (150 micrograms/kg, intravenously over 1 h, n = 8) or Ringer's lactate (control, n = 8). Arterioles were studied in vitro in a pressurized, partially contracted, no-flow state with video-microscopy. Precontracted (30-50% of baseline diameter) control coronary arterioles dilated in responses to either 5-HT (24 +/- 2%) or ADP (89 +/- 2%). These relaxations were partially inhibited by indomethacin, but were markedly reduced with nitric oxide synthase inhibition. After 3 h of endotoxemia, 5-HT caused contraction of coronary arterioles which was inhibited with indomethacin. In the presence of indomethacin, coronary vessels from endotoxic pigs relaxed slightly, but significantly, more to 5-HT than did control vessels exposed to indomethacin. In contrast, the relaxation response to ADP was unchanged following endotoxemia. Precontracted (15-30% of baseline diameter) pulmonary arterioles dilated in response to 5-HT (13 +/- 1%) or ADP (67 +/- 3%). Following 3 h of endotoxemia, the pulmonary arteriolar relaxation induced by 5-HT was reduced, whereas the response to ADP was not altered. In both coronary and pulmonary arterioles, relaxation induced by the endothelium-independent vasodilator, sodium nitroprusside, was unaffected by endotoxemia. Thus, coronary and pulmonary microvascular relaxation response to ADP are minimally affected by 3 h of endotoxemia, but relaxation responses to 5-HT are significantly reduced or converted to contractile responses." @default.
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- W2072023215 date "1994-04-01" @default.
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- W2072023215 title "ESCHERICHIA COLI ENDOTOXEMIA ALTERS CORONARY AND PULMONARY ARTERIOLAR RESPONSES TO PLATELET PRODUCTS" @default.
- W2072023215 doi "https://doi.org/10.1097/00024382-199404000-00006" @default.
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