The pudendal nerve block for ambulatory urology: What's old is new again. A quality improvement project

Summary Introduction Caudal epidural analgesia (CEA) is a common analgesic technique performed for pediatric penile surgeries; however, it has associated morbidity. The pudendal nerve block (PNB) has been described as an effective analgesic alternative to CEA. Objective In this quality improvement study, we aim to assess the efficacy of PNB as compared to CEA within our ambulatory surgery center (ASC). We demonstrate our initial experience employing PNB for ambulatory pediatric urology procedures. Study design Using retrospective, non-randomized, time-series, observational data, a comparative effectiveness study of CEA and PNB was performed. Patients less than three years old, who underwent circumcision, hypospadias repair, congenital chordee repair, correction of penile angulation/torsion, and buried penis repair with or without scrotoplasty, between January 1, 2015–September 9, 2019 with either CEA or PNB in an ASC at a single institution were included. Standard protocols for local and postoperative analgesia were used. Outcome measures were post anesthesia care unit (PACU) pain scores, morphine rescue rates, and PACU length of stay (LOS). These were analyzed using statistical process control (SPC) charts; standard SPC rules were used to detect special cause variation. Results A total of 999 patients were identified; 746 (74.7%), 172 (17.2%) and 81 (8.1%) received CEA, ultrasound guided PNB (US-PNB) and landmark directed PNB (LD-PNB), respectively. Demographic data was comparable between the three cohorts. There was no special cause variation in the outcome measures between the CEA, US-PNB and LD-PNB cohorts for maximum pain score, morphine rescue rates and PACU LOS. Discussion Pain outcomes and PACU LOS were similar between the CEA, US-PNB and LD-PNB cohorts, suggesting equivalent postoperative pain control between these techniques within our cohort. Previous published data has reported lower postoperative pain scores with PNB as compared to CEA for patients undergoing circumcision and hypospadias repair. Conclusion PNB is non-inferior to CEA for analgesia for pediatric penile surgery, with LD-PNB being as effective as US-PNB. Given the simplicity and documented lower risk profile, PNB may be preferred to CEA for ambulatory pediatric urology procedures. Summary Table . Comparison of Primary and Secondary Outcome Measures Outcome Measure (n) CEA (746) US-PNB (172) LD-PNB (81) Mean of PACU Maximum Pain Score (0–10) 2.50 2.98 2.16 PACU Morphine Administration (%) 2.80 6.94 2.47 PACU Length of Stay (Minutes) 57.77 59.05 57.37 Abbreviations: CEA, caudal epidural anesthesia; PACU post anesthesia care unit; US-PNB, ultrasound guided pudendal nerve block; LD-PNB, landmark directed pudendal nerve block.