Caudal block (CB), a regional anesthesia technique, is the most commonly used neuraxial block method for postoperative pain control in sub-umbilical surgeries in children. However, peripheral nerve blocks have been reported to be preferred in recent years in the literature since they provide longer and safer analgesia. One of these blocks, the erector spina plane (ESP) block, has been shown to provide effective postoperative analgesia when administered from the lumbar level for sacral and lower abdominal surgeries and urogenital surgeries in pediatric patients.

Circumcision and any lower abdominal surgery in the pediatric population result in a very painful postoperative period, even when each procedure is evaluated separately. Caudal block (CB), a regional anesthesia technique, is the most commonly used neuraxial block method for postoperative pain control in sub-umbilical surgeries in children. However, peripheral nerve blocks have been reported to be preferred in recent years in the literature since they provide longer and safer analgesia. One of these blocks, the erector spina plane (ESP) block, has been shown to provide effective postoperative analgesia when administered from the lumbar level for sacral and lower abdominal surgeries and urogenital surgeries in pediatric patients. As far as we know, there is no previous study in the literature comparing CB and ESP block in pediatric patients.

Inclusion Criteria:

• 1-7 years of age
• ASA (American Society of Anesthesiologists) I-II group
• Scheduled for circumcision and unilateral lower abdominal surgery at the same session
• Able to communicate in Turkish
• Willing to participate to the study (parents and children)

Exclusion Criteria:

• Less than 1 or more than 7 years of age
• A neurological deficit, bleeding diathesis, or a history of local anesthetic allergy; an infection or redness in the injection area, congenital lumbar anomaly, liver and/or kidney disorder, a psychiatric disorder, mental retardation, or communication problems detected during examination
• Unwilling to to participate to the study ((parents or children)