Low-dose caudal versus dorsal penile nerve block for postoperative analgesia after circumcision: a randomized comparative study

Introduction:
Paediatric male circumcision is a painful surgical procedure, which is usually carried out under general anaesthesia. Regional analgesic techniques, including dorsal penile nerve block (DPNB) and caudal nerve block (CNB), are superior to opioid and non-opioid systemic analgesia for postoperative pain control after circumcision.

Material and methods:
The purpose of our study was to compare the efficacy, duration of postoperative analgesia, and complications of DPNB, CNB, and the combination of 2 blocks. Eighty-one male patients aged from 3 to 12 years scheduled for circumcision were distributed into 3 groups, each consisting of 27 patients; group 1 (DPNB group), group 2 (CNB group), and group 3 for combined blockade. This study compared the 3 groups in terms of intraoperative vital signs: heart rate and blood pressure, postoperative Wong-Baker score, and complications (nausea, vomiting, pruritus, urinary retention, and constipation).

Results:
The intraoperative haemodynamics did not differ between the 3 groups of the study. There is significant difference in the Wong-Baker scale postoperatively at 1, 3, and 24 hours, being significantly less in the CNB group and combined blockade group than in the DPNB group, but there was no significant difference between the CNB group and the combined blockade group. The incidence of complications showed no significant intergroup difference, except for urinary retention being lower with DPNB.

Conclusions:
Both caudal and combined blockade were superior to DPNB for intraoperative and postoperative analgesia after circumcision. CNB and combined blockade was associated with significantly higher incidence of urinary retention compared to DPNB. Also, there was no additional benefit to the analgesic efficacy from combining both blocks.