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We examined in vivo monitoring of hydroxyl radical (.OH) generation during myocardial ischemia for 30 min by occluding the left anterior descending (LAD) in dog heart using a microdialysis technique. The hydroxyl radical reacts with salicylate and generates 2,3- and 2,5-dihydroxybenzoic acids (DHBA) which can be measured electrochemically in picomole quantity by a high pressure liquid chromatography-electrochemical (HPLC-EC) procedure. When the premature ventricular contraction (PVC) occurred at almost 25 sec intervals, marked elevation of the levels of 2,3- and 2,5-DHBA was observed in the heart dialysate of 30-min ischemia. This study demonstrated the generation of .OH in the canine heart subjected to 30-min ischemic insult.
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