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Effects Of Dantrolene On Rat Diaphragm Muscle During Postnatal Maturation

G. Orliaguet, O. Langeron, C. Coirault, S. Fratea, P. Coriat, B. Riou
Published 2001 · Medicine

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Background Dantrolene is the only known effective treatment for malignant hyperthermia. However, its effects on diaphragm muscle during postnatal maturation remain unknown. Methods The effects of dantrolene (10−8 to 10−4 m) were investigated in vitro on diaphragm muscle strips in adult rats and in postnatal rats aged 3, 10, and 17 days, and compared with those of ryanodine (10−8 to 10−6 m). The authors studied contraction and relaxation under isotonic and isometric conditions (29°C, Krebs-Henseleit solution, tetanic stimulation at 50 Hz). Data are mean ± SD. Results During postnatal maturation, the authors observed a progressive increase in active force developed per cross- sectional area (from 34 ± 25 to 69 ± 32 mN/mm2;P < 0.05) and maximum shortening velocity (from 2.9 ± 0.5 to 4.9 ± 1.4 Lmax/s;P < 0.05). Dantrolene induced a negative inotropic effect in diaphragm muscles in isotonic and isometric conditions in all groups, but this effect was significantly less marked in the 3-day-old rats compared with older rats. Dantrolene did not induce significant lusitropic effects during postnatal maturation. Developmental changes in the pharmacologic response to dantrolene were more rapid than those of ryanodine. Conclusion Dantrolene induced less pronounced negative inotropic effects on the diaphragm in neonatal rats as compared with adult rats. Our study suggests that developmental changes in the pharmacologic response to dantrolene are more rapid than those of ryanodine.
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