A 34-year-old male is brought to the emergency department 2 hours after being found hanging from a ceiling fan at home. He is unconscious, cyanosed, with severe facial congestion and petechiae over the face and neck. Vital signs: BP 160/95 mmHg, HR 128/min, RR 8/min (shallow), SpO₂ 65% on room air. What is the most appropriate immediate next step in management?