Which histologic findings are characteristic of dilated cardiomyopathy?

Updated: Mar 02, 2021
  • Author: Vinh Q Nguyen, MD, FACC; Chief Editor: Gyanendra K Sharma, MD, FACC, FASE  more...
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Findings may include myocardial injury with inflammatory mediators (eg, macrophage derived, antibody/complement). Physical disruption of myocytes by inflammatory cells, proliferation of interstitial cells, and increased fibrous matrix may also be found.

Lymphocytic myocarditis is the most common finding in human cardiac tissue biopsy specimens. Myocyte necrosis, degeneration, or both with adjacent inflammatory infiltrate may be present. Changes suggestive of coronary artery disease may be present. A predominance of lymphocytes and some monocytes without significant eosinophils may be present. Lymphocytic myocarditis is likely related to viral or other infections.

Eosinophilic myocarditis, sometimes called Löffler or Loeffler myocarditis, is usually due to the effects of a drug allergy. Perivascular infiltrates with eosinophil predominance, lymphocytes, and macrophages may be present. Eosinophilic myocarditis usually occurs with peripheral eosinophilia, rash, and/or fever.

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