evaluation the reversal of neuromuscular blocking by sugammadex versus neostigmine through assessing the residual neuromuscular blocking effect by ultrasound imaging of expiratory muscle strength and diaphragmatic excursion.

All patients will be assessed preoperatively by careful history taking (history of allergy to rocuronium, neostigmine, or sugammadex), full medical history taking , ASA classification and surgical history Premedication with 2mg midazolam. Anesthesia will be induced with propofol 1-2 mg /kg and fentanyl 1-2 mic/kg. After calibration of TOF (train of four) rocuronium 0.6 mg/kg will be administered, and tracheal intubation will be performed in the absence of train-of four (TOF) count. Rocuronium 0.15mg/kg and Sevoflurane will be used for maintenance of anesthesia.

At the end of the surgery, patients in group A will receive sugammadex (2 mg/kg) and patients in group B will receive neostigmine (50 μg/kg, maximum 5 mg) combined with atropine (25 μg/kg, maximum 2.5 mg) after TOF counts at least exceeding 1 and extubation will be performed in the operating room when the patient is fully awake and fulfilled clinical criteria for extubation.

Diaphragm excursion (DE), reflecting the expiratory and inspiratory muscle strength, respectively, will be measured via ultrasonography.

Inclusion Criteria:

• Patients with American Society of Anesthesiology (ASA) physical status classification I and II

Exclusion Criteria:

• 1. American Society of Anesthesiology (ASA) physical status classification III-V 2. renal impairment 3. Significant liver disease (Child-Pugh B or C class) 4. History of chronic obstructive pulmonary disease 5. Known or suspected neuromuscular disease. 6. Cardiac arrhythmia or use of antiarrhythmic drugs.