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Hypospadias is one of the most common congenital anomalies in childhood, requiring surgical reconstruction (1). It is a penile malformation with a more proximal or ventral location beyond the usual localization of the urethra. Hypospadias is a common congenital urogenital anomaly in male children, and its incidence is reported to be approximately one in every 300 births. However, it is suggested that hypospadias may increase in developed countries (2, 3). Postoperative pain management followinghypospadias repair is of great importance, as inadequatepain control may lead to adverse endocrine, metabolic, and inflammatory stress responses, resulting in higher morbidity and poor recovery(4).
Regional anesthesia has gained increasing attention in pediatric surgery as a valuable tool for managing perioperative pain and improving surgical outcomes(5). The caudal epidural block has long been considered the gold standard technique fo infraumbilical surgeries, including hypospadias repair, due to its proven efficacy and safety (4). However, its limitations include a relatively short durationof analgesia, the need for larger local anesthetic volumes, and potential adverse effects such as motor block, urinary retention, and inadvertent dural puncture. These drawbacks have led anesthesiologists to explore alternative regional techniques(6-8) Recently, the sacral erector spinae plane (ESPB) block has been introduced as a novel technique for postoperative analgesia in children(9, 10). It is an emerging regional anesthetic technique with significant potential for clinical benefit Nevertheless, its exact mechanism(s) of action have been much debated. These mechanisms include neural blockade and central inhibition from direct spread of local anesthetic to the paravertebral or epidural space, and analgesia mediated by elevated local anesthetic plasma concentrations due to systemic absorption(11).
Evidence suggests sacral ESP block can give excellent analgesia in surgical procedures (12-14). Few studies have examined its use to alleviate acute pain after hypospadias surgery (15, 16). There is a lack of data on the postoperative analgesic efficacy in hypospadias surgery.
The addition of adjuvant agents to local anesthetics has been shown to enhance the quality and duration of regiona anesthesia(17).
Dexmedetomidine, an alpha-2 adrenergic agonist, has gained significant attention for its sedative, analgesic, and anxiolytic properties in pediatric anesthesia(18).
Dexmedetomidine, a highly selective α 2- α 2-adrenergic agonist, has demonstrated sedative and analgesic properties without significant respiratory depression, making it particularly attractive in pediatric anesthesia. When used as an adjuvan to local anesthetics, dexmedetomidine prolongs block duration and reduces rescue analgesic requirements(17).
Despite the established role of caudal block and the emerging potential of sacral ESPB, there is a lack of randomized controlled trials directly comparing their analgesic efficacy in pediatric patients when combined with dexmedetomidine
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