Acute fulminant eosinophilic myocarditis due to Giardia lamblia infection presented with cardiogenic shock in a young patient

Acute eosinophilic myocarditis is a relatively rare condition that may be associated with various eosinophilic diseases, such as parasitic infection, allergies, drug hypersensitivity, granulomatous disease, connective tissue disease, vasculitis, or primary hypereosinophilic syndrome (1). It is usually associated with peripheral eosinophilia, but it may rarely present with a normal peripheral eosinophilic count (2, 3). Herein, we describe a case of acute eosinophilic myocarditis due to Giardia lamblia presented with cardiogenic shock for a normal peripheral eosinophilic count upon admission, which was successfully treated with high-dose corticosteroids and metronidazole therapy.