Abdominal aortic cross-clamping. Metabolic and hemodynamic consequences.
We address the question of whether an oxygen debt develops during a period of abdominal aortic cross-clamping that may explain observed hemodynamic changes. Group 1 received morphine sulfate (1 mg/kg) during induction of anesthesia. Group 2 received same dose of morphine sulfate. Group 3 received 4 mg/kg of morphine sulfate. We measured the oxygen consumption (VO2) and the carbon dioxide production levels (VCO2), as well as hemodynamic and biochemical parameters. In groups 1 and 3, VO2 and VCO2 decreased 10% to 13% following abdominal aortic cross-clamping compared with values measured before cross-clamping. In group 2, VO2 and VCO2 decreased 3% and 7%, respectively. On unclamping, the greatest increase in VO2 was observed in group 3 (26%), while in groups 1 and 2, VO2 rose 18% and 5%, respectively. In all three groups, metabolic changes were not paralleled by hemodynamic or temperature changes. Results indicate that oxygen debt developed during abdominal aortic cross-clamping, but this has no effect on hemodynamic changes seen after unclamping. Higher dosage of narcotic administered during anesthetic induction did not temper increase in metabolic rate observed after unclamping.
D000368:Aged; D000758:Anesthesia; D001012:Aorta, Abdominal / Q000601:surgery*; D001014:Aortic Aneurysm / Q000601:surgery*; D001481:Basal Metabolism; D003250:Constriction / Q000009:adverse effects; D005260:Female; D006439:Hemodynamics; D006801:Humans; D007083:Iliac Artery / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009020:Morphine / Q000008:administration & dosage; D010100:Oxygen / Q000378:metabolism
D009020:Morphine; D010100:Oxygen