Eosinophilic myocarditis (EM) is a rare myocardial disease that results from various eosinophilic diseases, such as idiopathic hypereosinophilic syndrome, helminth infection, medications and vasculitis. Patients with EM may present with different severities, ranging from mild symptoms to a life-threatening condition. Diagnosis of EM is a challenge and requires an extensive workup, including endomyocardial biopsy. Treatment options are limited because EM is rare and there is a lack of randomised controlled trials. We report a case of EM that presented as cardiac tamponade, which was initially treated with high-dose prednisone and immunosuppressant medications without significant improvement. Mepolizumab (anti-interleukin (IL)-5 antibody) was then applied, leading to an increased ejection fraction and stabilised cardiac function. This case report shows, for the first time, that mepolizumab has novel effects in treating EM. Our findings suggest that mepolizumab can be used as a steroid-sparing agent for treating EM.
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