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Hypersensitivity myocarditis.

A P Burke1, J Saenger, F Mullick

  • 1Department of Cardiovascular Pathology, Armed Forces Institute of Pathology, Washington, DC 20306-6000.

Archives of Pathology & Laboratory Medicine
|August 1, 1991
PubMed
Summary
This summary is machine-generated.

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Hypersensitivity myocarditis, often linked to medications, shows specific histologic findings like eosinophils and mixed infiltrates. Cardiac symptoms and death did not correlate with infiltrate severity in this autopsy study.

Area of Science:

  • Cardiovascular Pathology
  • Immunopathology
  • Toxicology

Background:

  • Hypersensitivity myocarditis (HSM) is an inflammatory heart condition.
  • Drug-induced HSM is a recognized but challenging diagnosis.
  • Autopsy studies are crucial for understanding HSM pathology.

Purpose of the Study:

  • To characterize the histologic features of hypersensitivity myocarditis.
  • To identify commonly associated drugs.
  • To correlate histologic findings with clinical presentation and outcomes.

Main Methods:

  • Autopsy tissue specimens from 69 cases of hypersensitivity myocarditis were analyzed.
  • Histologic findings, including cell types and distribution of infiltrates, were documented.
  • Immunohistochemistry was used to characterize lymphocyte populations.

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  • Correlation with clinical symptoms and outcomes was assessed.

    • Main Results:

    • Commonly implicated drugs included methyldopa, hydrochlorothiazide, and ampicillin.
    • Predominant inflammatory cells were histiocytes, eosinophils, and lymphocytes (predominantly T cells).
    • Myocyte necrosis and vasculitis were observed in a significant proportion of cases.
    • Right ventricle involvement was common.
    • Cardiac arrhythmias or death did not correlate with infiltrate severity.
    • Eosinophils in the liver correlated with cardiac infiltration.

    Conclusions:

    • Drug-associated hypersensitivity myocarditis exhibits distinct histologic patterns.
    • Establishing a definitive drug association is challenging due to polypharmacy and lack of clear hypersensitivity criteria.
    • Clinical symptoms may not correlate with the degree of myocardial infiltration.
    • Lesions can be focal, potentially leading to missed diagnoses on endomyocardial biopsy.