Gabapentin Premedication to Reduce Postoperative Pain for Pediatric Tonsillectomy/Adenoidectomy: A Pilot Study.

PURPOSE: To examine the effects of preoperative gabapentin administration on postoperative pain in pediatric patients undergoing tonsillectomy/adenoidectomy (T/A) in a single ambulatory surgery location within a pediatric healthcare organization.

DESIGN

This randomized, controlled pilot study enrolled patients age 3-18 years with American Society of Anesthesiologists (ASA) scores of I-II undergoing T/A.

METHODS

Both gabapentin and placebo groups were given study medication preoperatively and received standard opiate regimens intraoperatively and postoperative pain instructions. Outcome measurements included: time to first analgesic medication in the postanesthesia care unit (PACU), mean acetaminophen, ibuprofen, and opiate doses in mg/kg. Additionally, we examined pain scores, medication use, and side effects reported by daily pain diaries completed by patients/families for 3 days postoperatively.

FINDINGS: Forty-nine patients were included in final analysis (gabapentin n = 26, placebo n = 23). Demographic and clinical characteristics of both groups were similar; the majority (46 of 49) were under the age of 13. Both groups received opiates in PACU. Some patients in both groups received hydrocodone/acetaminophen postoperatively. There were no reported differences in side effects between groups. Gabapentin group reported less use of opiates, acetaminophen, and ibuprofen post-discharge. We identified small effect sizes for opiates and acetaminophen, and medium effect size for ibuprofen (80.1% gabapentin versus 100% placebo, RR 0.81 [95% CI 0.67-0.97]). Median pain scores were 4 on a scale of 10 for both groups for all 3 days of follow-up. Overall median satisfaction score was 9, with a mean difference of 0.35 (95% CI -0.78 - 1.37). Analysis of variance revealed no difference in pain scores or satisfaction per pain diaries between the groups in general and no difference in score trajectory.

CONCLUSIONS

We were able to establish a rigorous process and feasibility to launch a larger, multi-center trial to examine this important issue. There remain few evidence-based options for acute pain relief in pediatric surgical populations besides opiates. Identifying opiate alternatives that are effective, cost efficient and safe are needed for pediatric tonsillectomy patients.