Dose-time-effect curves of antagonization to neuromuscular blockade(T_1 5%-10%) of rocuronium with neostigmine

Objective To evaluate the dose-time-effect curves of antagonization to neuromuscular blockade(T15%~10%)of rocuronium with neostigmine.Methods Forty-five ASAⅠorⅡ patients without any neuromuscular disease undergoing abdominal operation under general anaesthesia were divided into three groups of 15 patients each and received various dose neostigmine(N50 group received neostigmine 0.05 mg/kg and atropine 0.025 mg/kg;N40 group neostigmine 0.04 mg/kg,atropine 0.020 mg/kg;N30 neostigmine 0.03 mg/kg,atropine 0.015 mg/kg at the end of surgery respectly.n=15).At the end of surgery,the infusion of rocuronium was stopped and various dose neostigmine was administered as antagonism.We recorded continuously the recovery value of T1 and TOFr for 10 minutes in the control.dose-time-effect curves were performed using SPSS10.0 Statistical package.Results The time-effect curves of T1 and TOFr were shifted obviously to left with the dose increase.Recovery of T1 to use neostigmine 0.05 mg/kg,0.04 mg/kg,0.03 mg/kg were 95%,79.7%,70.7%within 10 min,respectively.Recovery of TOFr were 0.85,0.72,0.64.The effective doses of neostigmine required to achieve a TOFr of 80%(ED80) after 10 min were more 0.045 mg/kg.Conclusion Adequate recovery was produced by neostigmine 0.05 mg/kg,which were used to antagonize to neuromuscular blockade(T15%~10%) of rocuronium within 10 min.It also appears that we have to use more neostigmine 0.045 mg/kg to obtain adequate antagonism of a similar degree of block.