[Control of postoperative pain in children undergoing hypospadias surgery: quasi-experimental controlled trial].

BACKGROUND: Hypospadias is one of the most common congenital anomalies occurring in approximately (1/300) male births. If it is not surgically corrected the consequences may negatively impact on quality of life in adolescents. The surgery is very invasive and the post-operative phase very painful. To improve the control of post-operative pain, continuous analgesia via epidural catheter was implemented. AIMS: To compare the effectiveness in controlling pain of two different regimens: continuous epidural catheter infusion vs oral and rectal non-steroidal pain-killers. MATERIALS AND METHODS: Comparative study on children undergoing hypospadias surgery. Group A (catheter) was treated with continuous postoperative analgesia via epidural catheter and Group B (scheduled times) with rectal and oral analgesics at scheduled times and on demand, after caudal block. In both groups nurses measured pain with VAS and FLACC scales (score from 0 to 10) for 72 hours after surgery. RESULTS: 41 children were studied (average age 64.1 months, SD 47.3), with 332 post-operative pain recordings (Group A n = 161, Group B n = 171). Mean pain score of Group A was 0.13 (SD 0.3) and 0.45 (SD 0.8) in group B, p = 0.006. The median duration of the epidural catheter was 65 hours, mean 51.8 hours (SD 24.3). During the 1st post-operative medication, the mean pain score in Group A was 1.2 (SD 1.4), and 3.2 (SD 1.8) in group B, p = 0.003. In group A the number of pain scores indicating pain (> 0) where 3.1% while in group B were 10.5%, p = 0.0007. CONCLUSIONS: In children undergoing hypospadias surgery, post-operative analgesia with continuous epidural catheter infusion seems to offer a better analgesic coverage than the traditional oral/rectal analgesic treatment at scheduled times and on demand.