期刊
FREE RADICAL BIOLOGY AND MEDICINE
卷 50, 期 9, 页码 1171-1176出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2011.01.021
关键词
Anesthesia; Ischemia/reperfusion; Isoprostanes; Isofurans; Free radicals
资金
- Australian and New Zealand College of Anaesthetists
- University of Western Australia
- Faculty of Medicine, Dentistry and Health Sciences
- National Institutes of Health [GM42056]
General and spinal anesthesia are used extensively in orthopedic surgery. However, these methods of anesthesia may result in different amounts of oxygen being delivered to the patient. Ischemia/reperfusion injury after release of the tourniquet initiates free radical-mediated oxidative stress. F-2-isoprostanes are reliable markers of in vivo lipid peroxidation. However, under conditions of high oxygen tension, isofurans are formed. We aimed to compare plasma isofurans and F-2-isoprostanes in spinal versus general anesthesia in patients undergoing knee-replacement surgery in a randomized, blinded study. Thirty-nine patients were randomized to spinal (SA: n = 19) or general anesthesia (GA: n = 20). Blood was collected before anesthesia, and a tourniquet was then applied to the limb during surgery. After release of the tourniquet, blood samples were collected at 30 min, 2 h, and 24 h for measurement of plasma F-2-isoprostanes and isofurans by gas chromatography-mass spectrometry. The two groups were comparable in age and body mass index. Plasma F-2-isoprostanes were significantly lower in the GA patients compared with the SA patients (p = 0.045). In contrast, the GA patients had significantly elevated plasma isofurans (p = 0.032). Increased isofurans during GA compared with SA are likely to reflect increased oxidative stress due to elevated oxygen concentrations during GA. Further studies are required to assess the implications of these findings on perioperative outcomes. (C) 2011 Elsevier Inc. All rights reserved.
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