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Effects of CO on PR prolongation (percent of animal with prolonged PR). PR prolongation (first degree AV block) was induced significantly following the intoxication with 3000 PPM of CO (*: p < 0.05 vs. control). First degree of AV block reduced significantly in EPO administrated animals, 2 h after the re-oxygenation (†: p < 0.05 vs. 3000 PPM 2 h after re-oxygenation).
