Transient Atrial Fibrillation After Epinephrine Use for Anaphylaxis

Anaphylaxis is defined as a generalized or systemic hypersensitivity reaction that occurs after exposure to certain antigens. Clinical presentations vary but life-threatening symptoms include upper and lower airway obstruction, which requires immediate treatment. Current standard treatment for anaphylactic shock includes epinephrine and volume resuscitation. Cardiac symptoms after epinephrine treatment in a patient with no prior cardiac history are often not suspected. In this case report, we present an unusual presentation of transient atrial fibrillation after an insect sting anaphylaxis and treatment with intramuscular (IM) and intravenous (IV) epinephrine.