To compare the effect of laryngeal mask airway general anesthesia alone versus laryngeal mask anesthesia combined with sacral block in high ligation of hernia sac in children.

From June 2018 to May 2020, 100 children of high ligation of hernia sac in Guangyuan Central Hospital were selected as subjects and randomly divided into laryngeal mask anesthesia combined with sacral block group (group S) and laryngeal mask anesthesia alone group (group L) using a random number table method, with 50 cases in each group. Before induction, 0.1% ropivacaine 1 ml/kg was used for sacral block in group S. Anesthesia induction and maintenance methods were the same in the two groups. After induction, laryngeal mask airway was inserted and mechanical ventilation was performed. The laryngeal mask was removed and patient was sent to anesthesia recovery room after operation. Mean arterial pressure (MAP) and heart rate (HR) of the two groups were recorded at the time of entering the room (T₀), after laryngeal mask insertion (T₁), at the beginning of operation (T₂) and after removing laryngeal mask (T₃). The operation time, anesthesia time and the dosage of remifentanil and sevoflurane were recorded in the two groups. Postoperative pain was evaluated by CRIES score, and the rate of rescue analgesia was recorded. The lower limbs motor function score (Bromage score) and incidence of urinary retention were recorded in the two groups.

There was no significant difference in gender composition, age, weight, operation time and anesthesia time between the two groups (P>0.05). There were significant differences in MAP and HR at different time points (P<0.05). Compared with group S, MAP and HR in group L were significantly increased at T₂ (P<0.01). Compared with T₀, MAP and HR in group S were significantly decreased at T₁ and T₂, while MAP and HR in group L were significantly decreased at T₁ (P<0.01). The dosage of remifentanil and sevoflurane in group S was significantly lower than that in group L, the scores of CRIES and the rate of rescue analgesia in group S were significantly lower than those in group L (P<0.01). There was no significant difference in Bromage score and the incidence of urinary retention between the two groups (P>0.05).

Laryngeal mask airway general anesthesia combined with sacral block in high ligation of hernia sac in children has good anesthetic effect, stable hemodynamics and fewer complications, which is conducive to the early recovery of children after operation.