Abstract: Objective To investigate whether the curative effect of Botulinum Toxic A(BTX-A) block increased and prolonged when the dose calculated according to certain formula.Methods 15 children with cerebral palsy(CP) were appointed as the trial group and the dose of BTX-A was calculated according to the designed formula.The other 58 CP children were appointed as the control group and the BTX-A dose was determined by routine method.Results After treatment,the motor function of the children in trial group was superior to that in the control group(P<0.05) and the duration of therapeutic effect of the trial group was significantly longer than the control group(P<0.001).Conclusion BTX-A dose calculated according to the formula can increase effect and prolong the duration.

Key words: cerebral palsy, spasticity, botulinum toxic A, nerve block, dose