Anaphylaxis Scenario

You are working as a Paramedic, Technician crew. You are called to a 44 year old suffering with difficulty in breathing. Information given is that the patient is allergic to wasp stings, and has just been stung by one. The patient has had to administer their epipen. You are 7 minutes away from the scene.

You arrive at the scene, a park in a rural location. You are waved over to a bench where passers by are trying to assist the patient who looks visibly distressed. He has a lot of swelling over his face, and you can hear an audible stridor. You conduct a quick primary survey, no cat haem, airway is partially compromised, breathing is rapid, circulation is poor, with 130 heart rate, 94/55 BP, and patient is V on AVPU scale.