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- W3150302669 abstract "To elucidate the mechanism of contractile dysfunction in postischemic (stunned) myocardium, time-resolved measurements of intracellular free Ca2+ concentration ([Ca2+]i) were made using gated 19F nuclear magnetic resonance in seven perfused ferret hearts loaded with the fluorinated Ca2+ indicator 5F-BAPTA. Left ventricular developed pressure decreased to 65 +/- 3% (mean +/- SEM) of control after 15 minutes of global ischemia at 37 degrees C. In stunned myocardium, diastolic [Ca2+]i (0.24 +/- 0.03 microM) was not changed from control (0.18 +/- 0.03 microM, p greater than 0.10), but peak [Ca2+]i (1.03 +/- 0.13 microM) was paradoxically higher than that in control (0.61 +/- 0.06 microM, p less than 0.02). The slope of the relation between developed pressure and Ca2+ transient amplitude in stunned myocardium was significantly lower than that in control (p less than 0.05), even after normalization by maximal Ca2(+)-activated pressure. These results indicate that contractile failure in stunned myocardium is d..." @default.
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- W3150302669 date "1990-01-01" @default.
- W3150302669 modified "2023-09-23" @default.
- W3150302669 title "Excitation-contraction coupling in postischemic myocardium. Does failure of activator Ca2+ transients underlie stunning?" @default.
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