A 7yo patient with peanut allergy at a rice krispy treat at a birthday party and discovered afterwards that it was made with peanut butter. She presents with hives, mild swelling of her lower lip and periorbital, and some faint wheezes. O2 sat is 99% on room air. Vital signs are temp 37.6, HR 120, RR 28, BP 90/60. What is your first priority treatment?
A. Diphenhydramine 1.25 mg/kg IV
B. Epinephrine 0.01 mg/kg of 1mg/mL solution IM
C. Methylprednisolone 2 mg/kg IV
D. Normal saline 20 cc/kg IV
E. RSI and prophylactic intubation
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