We aimed to investigate the effect of posterior quadratus lumborum block on postoperative atelectasis in inguinal hernia surgery in pediatric patients.

Inclusion Criteria:

• under 2 years old,
• ASA I-II risk group
• Patients who underwent an inguinal hernia operation under general anesthesia, posterior quadratus lumborum block for postoperative analgesia or pain treatment with conventional method
• Patients whose informed consent was read and approval was obtained from him and his guardian

Exclusion Criteria:

• who do not want to participate in the study,
• ASA III-IV-V patients