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- W4233909882 abstract "Dantrolene is used in patients with muscle spasticity and is the only known effective treatment for malignant hyperthermia.However, its effects on muscle relaxation and energetics are unknown and may have important consequences in diaphragmatic function. We studied the effects of dantrolene (10-8 to 10-4 M) on diaphragm muscle strips (n = 12) in the hamster in vitro (Krebs-Henseleit solution, 29[degree sign]C, 95% oxygen/5% carbon dioxide) in response to tetanic stimulation (50 Hz). We studied contraction and relaxation under isotonic and isometric conditions, as well as energetics. Data are mean +/- SD. Dantrolene induced a negative inotropic effect in the hamster diaphragm (active force at 10-4 M: 34% +/- 7% of baseline; P < 0.05) but did not significantly modify the curvature of the force-velocity relationship. Dantrolene did not significantly modify isotonic relaxation. Dantrolene, up to 10-5 M, did not significantly impair isometric relaxation. In conclusion, dantrolene induced a marked negative inotropic effect on diaphragm muscle without affecting myothermal efficiency and relaxation. Implications: Dantrolene induced a significant and concentration-dependent negative inotropic effect on diaphragm muscle but did not modify isotonic relaxation, which suggests no alteration of the calcium reuptake by the sarcoplasmic reticulum; up to 10-5 M dantrolene did not alter isometric relaxation, i.e., myofilament calcium sensitivity. Dantrolene did not modify the energetics of diaphragm muscle. (Anesth Analg 1999;89:466-71)" @default.
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- W4233909882 date "1999-08-01" @default.
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- W4233909882 title "The Effects of Dantrolene on the Contraction, Relaxation, and Energetics of the Diaphragm Muscle" @default.
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- W4233909882 doi "https://doi.org/10.1213/00000539-199908000-00041" @default.
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