High-flow Nasal Cannula Versus Conventional Oxygen During Awake Tracheal Intubation With Difficult Airways

Exclusion Criteria

• •Contraindications to HFNC use, such as severe nasal obstruction or deformity, recent (within 3 months) nasal or skull base surgery, skull base fracture, or active epistaxis;
• •Hemodynamic instability, defined as a mean arterial pressure (MAP) \< 65 mmHg or the need for vasoactive medications to maintain blood pressure;
• •Pregnancy;
• •Current participation in another interventional clinical trial.