Effect of Ultrasound-guided Erector Spinae Plane Block on Postoperative Pain and Sleep Quality of Infants With Congenital Pulmonary Cystic Disease After Thoracoscopic Surgery

This study is testing whether a nerve block technique called an erector spinae plane block (a type of numbing injection near the spine) can reduce pain and improve sleep in infants after chest surgery (thoracoscopy) for a congenital lung cyst condition. **You may be eligible if...** - Your baby is between 1 and 12 months old - They have been diagnosed with congenital cystic lung disease - They are scheduled for thoracoscopic surgery (minimally invasive chest surgery) to remove the affected lung tissue - Their ASA health status is I or II (generally healthy or with mild systemic disease) **You may NOT be eligible if...** - Your baby has a known allergy to local anesthetic medications - Your baby also has congenital heart disease - There is a skin infection or damage at the injection site - Your baby has scoliosis (curved spine) - You as a parent/guardian have declined participation Talk to your doctor to see if this trial is right for you.