You are asked to assess an 85-year-old man who was admitted to the hospital for...

This patient is critically unstable with severe hypoxia (SpO₂ 75% despite oxygen), central cyanosis, hypotension (no detectable blood pressure), and evidence of active vomiting—placing him at extremely high risk of airway compromise and aspiration . According to MCCQE resuscitation objectives and ABC principles, airway management is the immediate priority in a patient with respiratory failure and compromised airway protection.

Endotracheal intubation provides definitive airway control, allows suctioning of vomitus, prevents further aspiration, and enables mechanical ventilation with high-concentration oxygen. Noninvasive ventilation is contraindicated in patients with vomiting and impaired airway protection due to high aspiration risk. Chest compressions are indicated only if there is no pulse; this patient has a faint pulse. Intravenous fluids are important for hypotension but must follow airway stabilization. Nasogastric tube insertion does not address the immediate life-threatening hypoxia.

Early definitive airway control in unstable patients with hypoxemia and aspiration risk is essential to prevent cardiac arrest and improve survival outcomes.