Case report: Fulminant Myocarditis With Biopsy-Proven Eosinophilic Infiltration and Burned-Out Myocardial Pathology at Autopsy
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ID: 322322
2026
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Abstract
Abstract Background Fulminant myocarditis causes severe hemodynamic instability, requiring mechanical or inotropic support. In this setting, early endomyocardial biopsy is crucial to identify specific subtypes like eosinophilic or giant cell myocarditis, which require immediate and targeted immunosuppressive intervention. Case Summary A 54-year-old female patient presented to a local clinic with several days of fever and dyspnea, presenting in a state of shock with markedly elevated cardiac enzymes. Although electrocardiography and transthoracic echocardiography findings initially suggested acute myocardial infarction, coronary angiography revealed no significant stenosis. Consequently, fulminant myocarditis was suspected. Following cardiac arrest and initiation of venoarterial extracorporeal membrane oxygenation and Impella CP, she was transferred to our hospital. Endomyocardial biopsy revealed myocardial necrosis with inflammatory cell infiltration, including prominent degranulating eosinophils, consistent with eosinophilic myocarditis. Despite steroid pulse therapy and escalation of immunosuppression with tacrolimus and mycophenolate mofetil, the patient developed persistent electrical silence without mechanical recovery and died. Autopsy revealed near-complete loss of viable cardiomyocytes with chronic inflammation and interstitial fibrosis, consistent with burned-out myocardial pathology. Discussion This case highlights the devastating nature of fulminant myocarditis, specifically when characterized by extensive and irreversible cardiomyocyte destruction. Once massive myocardial loss has occurred, conventional interventions—including mechanical circulatory support and intensive immunosuppressive therapy—may reach their therapeutic limits. This clinical-pathological correlation underscores the critical necessity of early risk stratification to identify patients at risk for profound tissue damage. Moving forward, refining strategies for timely therapeutic escalation and establishing realistic clinical goals remain pivotal challenges in the management of this lethal pathophysiology.
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| Authors | Rui Katano, Atsushi Tada, Hirokazu Sugino, Toshiyuki Nagai, Toshihisa Anzai |
| Journal | European Heart Journal - Case Reports |
| Year | 2026 |
| DOI |
10.1093/ehjcr/ytag562
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| URL | |
| Keywords | Keywords not found |
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