This study is to evaluate the recovery of diaphragm function and atelectasis after reversal of neuromuscular blockade with Neostigmine and Sugammadex using lung ultrasound and diaphragm ultrasound for children aged 2 to 7 who are scheduled for the surgical procedure under general anesthesia.

Inclusion Criteria:

• Patients between the ages of 2 and 7 who are scheduled for surgery lasting more than 1 hour under general anesthesia using a neuromuscular blocking agent

Exclusion Criteria:

• Patients with a history of severe respiratory disease with a high risk of bronchoconstriction
• Patients with abnormal findings on preoperative chest radiography such as severe atelectasis, pneumothorax, pleural effusion, or pneumonia.
• Patients with severe renal or liver disease, or neuromuscular disease
• Patients with a history of allergy to drugs (sugammadex, rocuronium neostigmine)
• Patients with significant bradycardia
• Patients scheduled for surgery where estimated blood loss during surgery is expected to be more than 30% of estimated blood volume, or cases where fluid imbalance is expected to be severe during surgery
• patients scheduled for lung parenchyme/diaphragm/thoracic surgery
• other researchers considered it inappropriate to participate in research.