Effects of different doses of dexmedetomidine on etomidate in inhibiting the EC50 of laryngeal mask placement / 中国生化药物杂志

ABSTRACT

Objective To investigatethe EC50 of different doses of dexmedetomidine on etomidate inhibited responses tolaryngeal maskinsertion in patients.Methods 88 with breast cancerfrom surgical department in Zhuji Hospital of Traditional Chinese Medical from August 2014 to August 2015were selected and randomly divided into the control group(groupA)and the experiment group(group B1,group B2 and group B3)with 22 casesin each group,respectively,intravenous pump 0.9％sodium chloride solution and DEX(dose followed by 0.3,0.6,0.9μg/kg).The next sequential intravenous infusion of etomidateafter 10 min.The EC50 and the 95％confidence interval of etomidate were determined by sequential method in each group of patients,the changes of vital signs and adverse reactionsin patients were monitored.Results Four groups of patients with LMA EC50 and 95％confidence interval of etomidate respectively0.78(0.723～0.835)μg/mL in group A,0.66(0.612～0.711)μg/mL in group B1,0.58(0.532～0.627)μg/mL in group B2,0.46(0.416～0.521)μg/mL in group B3.Four groups of patients with laryngeal mask insertion immediately before MAP and HR were lower than the baseline value,the difference was statistically significant(P<0.05),but the LMA elevated after one min.The control group of four patients with respiratory depression,three cases of patients with bradycardia in group B3,two cases of patients with hypotension were improved after symptomatic treatment.Conclusion In a certain range,increasing the dose of dexmedetomidine reduces the effective concentration of etomidate,which inhibits the laryngeal mask placement reaction.