Reperfused-viable and reperfused-infarcted myocardium: differentiation with in vivo P-31 MR spectroscopy.

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Abstract
The ability of in vivo phosphorus-31 magnetic resonance (MR) spectroscopy to pemit accurate distinction between reperfused-viable and reperfused-infarcted myocardium was examined in a canine model of acute coronary occlusion. In vovo myocardial pH and phosphocreatine, adensoine triphosphate, and inorganic phosphate levels were measured at baseline and for the first 90 minutes after reperfusion of a total coronary artery occlusion producing either predominantly viable (nine animals) or infarcted (nine animals) myocardium in the region of metabolic study. Myocardial viability was assessed in each animal by means of postmortem triphenyltetrazolium chloride staining. Tissue was characterized from the in vivo P-31 MR data by means of logistic regression analysis. The accuracy of using the P-31 MR data for distinguishing reperfused-viable from reperfused-infarcted myocardium was 100% (69 of 69% data points, 18 of 18 animals). Results of the logistic regression procedure indicated that phosphocreatine was the metabolic variable enabling most effective separation of reperfused-viable and reperfused-infarcted myocardium. Thus, metabolic data obtained with P-31 MR spectroscopy permit effective separation of reperfused-viable from reperfused-infarcted myocardium.