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JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Effect of high-dose vitamin C on oxygen free radical production and myocardial enzyme after tourniquet ischaemia-reperfusion injury during bilateral total knee replacement.
This study investigated the effects of high-dose vitamin C on oxygen free radical production and cardiac enzymes after tourniquet application and ischaemia-reperfusion injury during bilateral total knee replacement (TKR) in elderly patients. In the vitamin C (VC) group (VC group, n = 16), during surgery, patients received a priming bolus of 0.06 g/kg vitamin C with 100 ml saline followed by 0.02 g/kg vitamin C mixed with 30 ml saline, intravenously. The control group (n = 16) received no intra-operative vitamin C. In the VC group, malondialdehyde levels were lower, and arterial oxygen tension and mean blood pressure were higher, than in controls after post-operative deflation of both knee tourniquets. Troponin I levels were lower in the VC group than in controls 8 h post-operation. Administering high-dose vitamin C during bilateral TKR could prevent oxygen free radical production and a decline in arterial oxygen tension and mean blood pressure induced by ischaemia-reperfusion injury, thereby protecting the myocardium.
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