COMBO Endoscopy Oropharyngeal Airway in Sedated Fiberoptic Bronchoscopy for Patients: A Simon Two-Stage Trial

Inclusion Criteria: * Age 18≤ Age ≤70.·Patients undergoing fiberoptic bronchoscopy. * Patients have signed the informed consent form. * The ASA classification ranges from I to II. * The estimated duration of the procedure does not exceed 45 minutes. Exclusion Criteria: * Patients with contraindications to oropharyngeal airway ventilation, such as coagulation disorders, predisposition to oral/nasal bleeding, mucosal damage, or anatomical obstructions hindering oropharyngeal airway placement. * Patients diagnosed with acute exacerbation of chronic obstructive pulmonary disease (COPD) or those currently suffering from other acute/chronic pulmonary conditions requiring long-term or intermittent oxygen therapy. * Patients with preoperative SpO₂ \< 95% while breathing air. * Patients with BMI \< 18.5 or BMI \> 30. * Patients with upper respiratory tract infections (oral, nasal, or pharyngeal). * Patients at risk of aspiration. * Patients with fever (core temperature \> 37.5°C). * Patients with severe cardiac insufficiency (\< 4 METs). * Patients with severe renal insufficiency requiring preoperative dialysis. * Patients with a confirmed diagnosis of hepatic insufficiency. * Patients with increased intracranial pressure. * Patients with hypersensitivity to sedatives like propofol or medical equipment such as adhesive tape. * Patients with a history of drug abuse and/or alcoholism within the two years preceding the commencement of the screening period (defined as drinking more tha…