MSFinals-0033

MSFinals-0033

You are with the on-call anaesthetist who has been asked to see a 30-year-old man blue-lighted into the Emergency Department. The patient complains of being stung by a wasp while running and reports his arm becoming immediately swollen and red. He kept running but, within a few minutes, began to feel very light-headed and had difficulty breathing. On examination, the patient looks flushed and has a widespread wheeze on auscultation. Blood pressure 76/55 mmHg, heart rate 150 bpm, respiratory rate 32 breaths/minute.
Which of the following is the best initial treatment?