A 56-year-old man presents after a bee sting half an hour ago. He reports sudden onset of an itchy rash, swelling, and difficulty breathing. His blood pressure is 88/58 mmHg, pulse is 104/min, and respirations are 24/min. On exam, he has swollen lips and generalized erythematous urticarial plaques over his face and chest. There are wheezes audible with each breath. He is given intramuscular epinephrine and fluid bolus.