A cellular mechanism for impaired posthypoxic relaxation in isolated cardiac myocytes. Altered myofilament relaxation kinetics at reoxygenation.

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Cellular Mechanism for Impaired Posthypoxic Relaxation in Isolated Cardiac Myocytes Altered Myofilament Relaxation Kinetics at Reoxygenation

Single, isolated rat ventricular myocytes were made hypoxic for 10 minutes and then reoxygenated. During hypoxia, there was a marked abbreviation of the mechanical twitch, without a decrease in its amplitude. Immediately after reoxygenation, both the time to peak shortening and the duration of relaxation were markedly prolonged, and they remained prolonged for 10-50 minutes. The alterations in ...

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A cellular mechanism for impaired posthypoxic relaxation in isolated cardiac myocytes. Altered myofilament relaxation kinetics at reoxygenation.

Single, isolated rat ventricular myocytes were made hypoxic for 10 minutes and then reoxygenated. During hypoxia, there was a marked abbreviation of the mechanical twitch, without a decrease in its amplitude. Immediately after reoxygenation, both the time to peak shortening and the duration of relaxation were markedly prolonged, and they remained prolonged for 10-50 minutes. The alterations in ...

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Myofilament properties comprise the rate-limiting step for cardiac relaxation at body temperature in the rat.

The majority of studies aimed at characterizing basic contractile mechanisms have been conducted at room temperature. To elucidate the mechanism of cardiac relaxation under more physiological conditions, we investigated contractile function and calcium handling in ultrathin rat cardiac trabeculae. Active developed tension was unaltered between 22.5 and 30.0 degrees C (from 89 +/- 10 to 86 +/- 1...

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A semidefinite relaxation scheme for quadratically constrained

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ژورنال

عنوان ژورنال: Circulation Research

سال: 1991

ISSN: 0009-7330,1524-4571

DOI: 10.1161/01.res.69.1.196