Effects of dantrolene pretreatment on diaphragmatic function in septic rats / 中华麻醉学杂志

ABSTRACT

Objective To evaluate the effects of dantrolene pretreatment on diaphragmatic function in septic rats .Methods Thirty adult male Sprague-Dawley rats , weighing 200-220 g , aged 9-10 weeks , were randomized into 3 groups (n=10 each) using a random number table :sham operation group (group S) ,spesis group (group CLP) and dantrolene group (group D) .The animals were anesthetized with pentobarbital sodium . Dantrolene 6 mg/kg was injected intraperitoneally (in dimethyl sulfoxide 500 μl ) .Sepsis was induced by cecal ligation and puncture 1 h later in CLP and D groups .The left and right diaphragm was rapidly excised at 24 h after cecal ligation and puncture . The left diaphragm was used to detect the systolic function including the single stimulation twitch , dmax/dt , dmin/dt , maximal force of tetanic contraction , force-frequency curves , and fatigue index .Results Compared with group S ,the single twitch myopalmus ,dmax/dt ,dmin/dt ,maximum peak tension and fatigue index were significantly decreased in group CLP ,the single stimulation twitch ,dmax/dt ,dmin/dt and maximal force of tetanic contraction were decreased , fatigue index was increased in group D , and the force-frequency curve was shifted downward in CLP and D groups ( P<0.05 or 0.01) .Compared with group CLP ,the single stimulation twitch ,dmax/dt ,dmin/dt ,maximal force of tetanic contraction and fatigue index were significantly increased in group D ( P< 0.05 or 0.01 ) .Conclusion Dantrolene pretreatment can improve diaphragmatic function in septic rats .