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- W2014370085 abstract "Background The terminally failing human myocardium exerts a negative force-frequency relationship (FFR), whereas a positive FFR occurs in nonfailing myocardium. To study the possibility of pharmacologically influencing this defect of the failing human heart, the effect of halothane on the basal FFR and the FFR in the presence of isoproterenol and ouabain was investigated. Methods Experiments were performed on isolated, electrically driven (0.5-2 Hz, 37 degrees C, Ca2+ 1.8 mmol/l) ventricular preparations. Myocardium from human failing and nonfailing hearts was obtained at cardiac surgery. To further characterize the studied myocardium, the positive inotropic effect of isoproterenol and the density of beta-adrenoceptors were measured using the radioligand 125I-CYP. Results Halothane produced a negative inotropic effect. The anesthetic (0.38 mmol/l) reversed the negative FFR in failing myocardium, antagonized the effect of isoproterenol (0.1 mumol/l) on FFR, and restored the FFR in the presence of ouabain. Conclusions Halothane restores the FFR in human failing myocardium possibly by influencing the intracellular Ca2+ homeostasis. These findings provide evidence that pharmacologic interventions, e.g., during anesthesia, may influence contractility also as a result of a depressed or enhanced FFR." @default.
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- W2014370085 date "1995-06-01" @default.
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- W2014370085 title "Halothane Restores the Altered Force-Frequency Relationship in Failing Human Myocardium" @default.
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- W2014370085 doi "https://doi.org/10.1097/00000542-199506000-00017" @default.
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