Selection of Endotracheal Tube Diameter for General Anesthesia in Obese Patients: A Prospective Randomized Controlled Study Based on Chest CT Images

INTERVENTION: Control group:Choose an endotracheal tube according to traditional experience;Experimental group:Personalized selection of endotracheal tube intubation based on actual airway diameter measured under CT; CONDITION: Nausea and vomiting; Hoarseness;Cough;Sore throat;Pneumonia;Atelectasis. PRIMARY OUTCOME: Postoperative respiratory complications (Nausea and Vomiting; Hoarseness; Cough; Sore Throat; Pneumonia; Atelectasis); SECONDARY OUTCOME: Preoperative and postoperative blood routine;Dynamic lung compliance;Circulation indicators (intraoperative blood pressure, heart rate, blood oxygen, etc.);Airway peak pressure, airway plateau pressure, driving pressure;Preoperative and postoperative blood gas analysis indicators: arterial blood PH, PaO2, PaCO2, oxygenation inde X(PaO2/FiO2), alveolar‐arterial oxygen partial pressure difference (A‐aDO2), respiratory; INCLUSION CRITERIA: 1. Age 18 65, regardless of gender, undergoing laparoscopic surgery; 2. ASA Classification I III; 3. BMI >=28kg/m²; 4. No other serious systemic diseases; 5. Operation duration <2h.