The study will include 40 patients who fulfil all the points in the inclusion and exclusion criteria will be randomized into two equal groups, each consisting of 20 patients, namely group (B) and group (C).

• Group (B): will receive erector spinae plane block.
• Group (C): will not receive any block. Postoperative pain score will be assessed using the FLACC scale or Face, Legs, Activity, Cry, Consolability scale immediately after extubation and at 1, 2, 4, 6, 8, 12, 18, and 24 hours. Routine postoperative analgesia in the form of intravenous paracetamol 7.5 mg/kg/6 hours will be given to all patients (the first dose is given after skin closure). Rescue analgesia in the form of 1 ug/kg fentanyl intravenously for patients if FLACC scale > 4, and the time for the first rescue analgesic administration will be recorded.

Inclusion Criteria:

• All pediatric patients presented for aortic coarctation repair via left thoracotomy.

Exclusion Criteria:

Hypersensitivity to local anesthetic.

• Mental or neurologic disorders.
• Preoperative critically ill patients.
• Parents or legal guardian refusal.
• Infection at the site of injection.
• Any liver disease.
• Any coagulopathy.