Your patient is a seven-year-old girl with a history of bee-…

Your patient is a seven-year-old girl with a history of bee-sting anaphylaxis. She was stung by a bee and nearly immediately began having difficulty swallowing and breathing. Her father administered her prescribed 0.15 mg epinephrine auto-injector without result. On your arrival, the patient responds to painful stimuli; has labored, rapid, wheezing respirations; a heart rate of 60; and a blood pressure of 92/60 mmHg. Which of the following is the best sequence of treatment for this patient?