[Ultrasound-guided caudal block with ropivacaine in infraumbilical surgeries in pediatric patients].

the results of both groups did not show differences between a volume of 0.75 mL and 1.2 mL, the administration of 0.2% ropivacaine is favored with the use of ultrasound, which allows effective administration of lower doses of local anesthetic with reduced risk of complications. It is necessary to carry out studies in other types of surgery to compare the use of less volume of local anesthetic compared to the Melman formula used in this study.