A 55-year-old man is brought to the ED with decreased consciousness after suspected heroin overdose. He has shallow respirations and pinpoint pupils, and oxygen saturation is 82% on air. What is the most appropriate immediate management?AGive naloxone without oxygenBProvide airway support and oxygen, then administer naloxone intravenous or intramuscularCInduce vomiting to remove the drugDGive flumazenilEObserve without intervention as he may recover spontaneouslyCheck my answer