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• W2325852835 abstract "We postulated that the attenuated pulmonary and systemic vascular contractility observed in sepsis was secondary to the release of vasodilator prostaglandins. We used the cyclooxygenase inhibitor meclofenamate to inhibit prostaglandin synthesis in an unanesthetized, chronically instrumented model of hyperdynamic sepsis. Sixteen male Sprague-Dawley rats (300-350 g) were randomized to either sepsis induced by cecal ligation and perforation (CLP, n = 8) or a sham procedure (Sham, n = 8). Vascular reactivity was assessed by measuring the hypoxic (FiO2 = 0.08) pulmonary pressor response (HPV), and the systemic pressor response to an intravenous infusion of phenylephrine (1.5-7.5 micrograms/kg/min) before and after the administration of meclofenamate (5 mg/kg intravenously, i.v.). Twenty-four hours postoperatively, CLP animals had significantly increased cardiac output (CO) as compared with Sham animals (204 +/- 12 vs. 148 +/- 5 ml/min, p < 0.05), slightly decreased mean arterial pressure (MAP) (109 +/- 4 vs. 118 +/- 3 mm Hg, p < 0.05), and decreased total systemic vascular resistance (TSVR) (0.546 +/- 0.046 vs. 0.805 +/- 0.030 mm Hg.min.ml-1, p < 0.05). Mean pulmonary artery pressure (MPAP) and total pulmonary vascular resistance (TPVR) were similar in both groups (p > 0.05). In response to hypoxia, the change in MPAP (delta MPAP) was 3.6 +/- 1.0 and 6.9 +/- 0.8 (mm Hg) in CLP and Sham animals, respectively (p < 0.05). Similarly, the change in TPVR (delta TPVR) during hypoxia was 0.012 +/- 0.006 and 0.038 +/- 0.009 mm Hg.min.ml-1 in CLP and Sham (p < 0.05). The pulmonary and systemic blood pressure (BP) response to phenylephrine was also attenuated in CLP as compared with Sham animals. After treatment with meclofenamate, differences were no longer apparent in the HPV response between CLP and Sham animals, due to a slight increase in the HPV response of CLP animals and a slight decrease in the HPV response in Sham animals. The attenuated pressor response to phenylephrine was not changed in either the pulmonary or the systemic circulation after the administration of meclofenamate. These data suggest that vasodilator prostaglandins may contribute to the attenuated pulmonary pressor response in sepsis. However, the mechanism of the attenuated HPV may be different than the attenuated response to exogenous catecholamines since meclofenamate had no effect on either the pulmonary or systemic response to a phenylephrine infusion in septic animals." @default.
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• W2325852835 date "1996-07-01" @default.
• W2325852835 modified "2023-10-14" @default.
• W2325852835 title "Cyclooxygenase Inhibition and Vascular Reactivity in a Rat Model of Hyperdynamic Sepsis" @default.
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• W2325852835 doi "https://doi.org/10.1097/00005344-199607000-00006" @default.
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