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• W1980080784 abstract "The purposes of this study were to evaluate the effects of acute myocardial ischemia with reperfusion on T1 (spin-lattice) nuclear magnetic resonance (NMR) relaxation times in a canine model and correlate these changes with bulk myocardial water content (%H2O). In 15 dogs the left anterior descending coronary artery was occluded for either 40 minutes (n = 5), 1 hour (n = 5), or 2 hours (n = 5). In 15 additional dogs, matched occlusion periods were followed by 3 hours of reperfusion. T1 of tissue from normal and ischemic myocardium was measured in vitro with a 2.5 kg NMR spectrometer. In the reperfusion animals, the 2-hour group showed significant increases in %H2O and T1 when the ischemic segment of myocardium was evaluated (both p < 0.01). All but one animal in the 1-hour (reperfusion) group showed increases in both %H2O or T1 in the ischemic segment of myocardium when compared to control segments. The mean values from the ischemic myocardium in the 1-hour group were significantly higher than the values from the matched control segment for %H2O (p < 0.05) and T1 (p < 0.05). In the group undergoing 40 minutes of ischemia followed by 3 hours of reperfusion, neither %H2O nor T1 changed significantly. In the nonreperfused animals, neither T1 nor %H2O content increased significantly after 40 minutes. Significant increases were seen in the 1-hour (p < 0.05) and 2-hour groups (withcut reperfusion) (p < 0.01). In addition, the 2-hour occlusion followed by reperfusion animals had significantly greater T1 relaxation times and %H2O than control ischemic animals. We conclude that acute myocardial ischemia of at least 1 hour in duration followed by reperfusion results in segmental myocardial edema as well as significant increases in T1 values. Reperfusion after irreversible injury may exacerbate regional edema formation. These findings indicate the potential utility of NMR imaging for monitoring the myocardial edema associated with reperfused myocardial infarctions." @default.
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• W1980080784 date "1985-03-01" @default.
• W1980080784 modified "2023-09-27" @default.
• W1980080784 title "Nuclear magnetic resonance analysis of acute myocardial infarction in dogs: The effects of transient coronary ischemia of varying duration and reperfusion on spin lattice relaxation times" @default.
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• W1980080784 doi "https://doi.org/10.1016/0002-8703(85)90552-6" @default.
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