Quadratus lumborum block (QLB) is a newly-defined trunk block performed with local anesthetic injection by imaging the abdominal muscles with ultrasonography (US) guidance; thus, analgesia is expected to be ensured from the T7-L1 dermatomal segment level.

In the study, the aim was to compare the postoperative analgesic effect of quadratus lumborum block in pediatric patients undergoing lower abdominal surgery

Patients included in the study were randomly divided into 2 groups. Cases were assessed as intravenous opioid with 1 mg/kg tramadol HCl (Group O, n=20) or ultrasonography-guided quadratus lumborum block (Group B, n=20).

Total analgesic amounts in 24 hours and first analgesic requirement times recorded.

Inclusion Criteria:

• The study included 40 cases undergoing lower abdominal surgery aged from 3 to 16 years with ASA (American Society of Anesthesiologist) I-II level.

Exclusion Criteria:

• Cases with ASA III-IV health level and those with a history of allergy to local anesthetic medications were not included in the study.

The investigator's study is a prospective, randomized, double-blind study.