[Effect of pediatric TCI system for propofol plus remifentanil in pediatric short-duration surgery with laryngeal mask airway anesthesia].

Objective: To study the effect of a pediatric TCI patent system for propofol plus remifentanil in pediatric short-duration surgery with laryngeal mask airway (LMA) anesthesia.

Methods: A total of 120 pediatric patients underwent short-duration elective surgery, aged 3 - 9 years old, weighted 13 - 26 kg, ASAI grade, were randomly divided into 3 groups (n = 40 each). The propofol concentrations of effect compartment were set at 2 µg/ml in Group A, 3 µg/ml in Group B and 4 µg/ml in Group C. The remifentanil initial concentration of plasma compartment was 2 ng/ml and increased stepwise by 0.5 ng/ml until a successful insertion of LMA. The remifentanil concentration was recorded when LMA was successfully inserted and the cases were numerated at the each remifentanil concentration. Heart rate (HR), mean arterial pressure (MAP), BIS (bispectral index) values and postoperative adverse events were also recorded at the time points of pre-induction (T0), 2 min post-remifentanil TCI (T1), LMA insertion (T2), skin incision (T3), 5 min post-skin incision (T4), 10 min post-skin incision, (T5) and beginning surgery (T6).

Results: The satisfactory ratios of a successful insertion of LMA were highest in remifentanil 3.0 ng/ml (AR subgroup), 2.5 ng/ml (BR subgroup) and 2.0 ng/ml (CR subgroup) respectively. The laryngeal mask satisfactory ratio was high in BR subgroup (P < 0.05). There were significantly differences of T1-T5 values of HR, MAP and BIS in AR and CR subgroups (P < 0.05), but not in BR subgroup. The above-mentioned monitoring indices at T2 in AR subgroup and T3 in CR subgroup were significantly higher than those in BR subgroup. There were more adverse reactions in CR and AR subgroups versus BR subgroup (P < 0.05).

Conclusion: The patented system for propofol 3 µg/ml effect compartment concentration plus remifentanil 2.5 ng/ml plasma concentration TCI displays stable hemodynamics, less stress, fewer complications and better clinical outcomes in pediatric short-duration surgery with LMA anesthesia.