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Stunned myocardium reflects postreperfusion dysfunction in myocardium that is destined to ultimately fully recover. Most investigators attribute postreperfusion stunning to a primary defect in excitation-contraction coupling or to an altered sensitivity of the myofilaments to calcium. The aim of the present study was to evaluate the interrelation between myocardial perfusion, oxidative metabolism, and function in an effort to better characterize the phenomenon of myocardial stunning, to define the regional efficiency of stunned myocardium, and to characterize its reserve capacity.

circulation

Enhancement of regional myocardial efficiency and persistence of perfusion, oxidative, and functional reserve with paired pacing of stunned myocardium.