Combination COMBO Endoscopy Oropharyngeal Airway With High-Flow Nasal Cannula Oxygenation in Sedated Gastrointestinal Endoscopy for Obese Patients

Inclusion Criteria: * Age 18≤ Age ≤70. * BMI ≥ 35 kg/m². * The ASA classification ranges from I to III. * Patients have signed the informed consent form. * Patients undergoing gastroendoscopy and colonoscopy procedure. * The estimated duration of the procedure does not exceed 45 minutes. Exclusion Criteria: * Patients who exhibit contraindications to oropharyngeal airway ventilation, such as coagulation disorders, a predisposition to oral and nasal bleeding, mucosal damage, or anatomical constraints impeding oropharyngeal channel placement. * Severe cardiac insufficiency, defined as a maximal exercise capacity of less than 4 metabolic equivalents (METs). * Profound renal insufficiency necessitating preoperative dialysis. * A confirmed severe liver dysfunction. * Patients diagnosed with chronic obstructive pulmonary disease (COPD) or those presently experiencing other acute and chronic pulmonary conditions necessitating prolonged or intermittent oxygen therapy. * Elevated intracranial pressure. * Upper respiratory tract infections, encompassing the oral, nasal, and pharyngeal regions. * Fever, defined as a core body temperature exceeding 37.5 degrees Celsius. * Pregnancy or lactation. * Hypersensitivity reactions to sedatives like propofol or medical equipment such as adhesive tape. * Urgent surgical intervention. * Polytrauma. * Peripheral oxygen saturation (SpO2) levels below 95% while breathing room air preoperatively. * BMI\<35 kg/m². * Patients with a documented histor…