Surgery is a common medical procedure that exposes children to pain. More than 85% of children experience clinically significant pain after surgery and 63% after discharge. Postoperative pain management in pediatric ages also plays a role in future pain perception and chronic pain development. It has been reported that acute postoperative pain progresses to chronic pain in 20% of children undergoing major surgery. It is also known that children with inadequate pain management experience a decline in immune and neuroendocrine functions later in life.~Inguinal hernia surgery is one of the most frequently performed elective surgeries in pediatric surgery practice and often performed in early childhood. The presence of postoperative pain delays the return to normal activity and prolongs the time to discharge. Ideal pain management should provide complete pain relief without interfering with the child's daily life, and the techniques and drugs used in the treatment should cause as few side effects as possible. Opioid and non-opioid analgesics have side effects such as itching, vomiting, delay in gastrointestinal function, urinary retention, respiratory depression, liver failure, antithrombotic effect, delayed wound healing, renal and gastrointestinal toxicity that limit their use in children.~In recent years, multimodal analgesia in which non-opioid analgesics are combined with small doses of opioids or regional blocks is increasingly preferred. Caudal block, one of the regional blocks, has been widely used in pediatric surgery for many years due to its proven effectiveness in postoperative analgesia. In addition, with the widespread use of ultrasound, many body blocks have become used with high success rates in both upper and lower abdominal surgeries in postoperative pain management. Erector spina plane block (ESPB), defined by Forrero et al. in 2016, is an interfacial plane block that is a simpler and safer alternative to thoracic epidural or paravertebral block. Its use for analgesia is common in adults in various surgeries, and its use in pediatric surgeries is also becoming widespread. In a review published in 2019, it was reported that only 23 of 242 ESPB cases were children. Clinical studies of ESPB applied in pediatric patients are not sufficient in the literature.~Tissue damage caused by surgery or trauma brings hormonal, metabolic and hemodynamic changes. It is known that post-surgical stress response causes major changes in the cardiovascular and respiratory systems. Controlling postoperative pain is associated with decreased stress hormone response. The scales used in the evaluation of postoperative pain in pediatric patients are insufficient due to the inability of the patients to express themselves and their high anxiety coefficients. For this reason, it has been suggested that stress hormone levels may be an objective method for determining the analgesic efficacy of the anesthetic technique. Early mobilization and postoperative pain management gain importance in inguinal hernia surgery, since they are outpatient surgical procedures.
Inguinal hernia surgery is the most common practice of pediatric surgeons in their clinical practice. As these operations are usually day case procedures, maintaining adequate analgesia is an important component of perioperative care and ERAS protocols. Caudal block, which is one of the analgesic methods used for postoperative pain, is the most frequently used in inguinal hernia surgery and its effectiveness has been proven. Erector spina plane block, which is easy to apply and has a low risk of side effects, is another tool used in the treatment of postoperative pain after inguinal hernia surgery. These are the procedures that are routinely applied in our center with the aim of intraoperative and postoperative effective analgesia.