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Related Experiment Videos

"Borderline" myocarditis: an indication for repeat endomyocardial biopsy.

G W Dec1, J T Fallon, J F Southern

  • 1Medical Service, Massachusetts General Hospital, Boston 02114.

Journal of the American College of Cardiology
|February 1, 1990
PubMed
Summary

Repeat endomyocardial biopsy is crucial for diagnosing myocarditis in dilated cardiomyopathy patients when initial results are inconclusive. "Borderline" findings on initial biopsy predict confirmation in subsequent tests, aiding treatment decisions.

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Area of Science:

  • Cardiology
  • Pathology

Background:

  • Dilated cardiomyopathy (DCM) diagnosis can be challenging, especially when initial endomyocardial biopsies are non-diagnostic.
  • Myocarditis is often suspected clinically but requires histological confirmation.

Purpose of the Study:

  • To evaluate the diagnostic yield of repeat endomyocardial biopsy in patients with suspected myocarditis and DCM.
  • To identify predictors of myocarditis confirmation on repeat biopsy.

Main Methods:

  • A cohort of 28 patients with DCM (≤12 months duration) and symptomatic heart failure or ventricular arrhythmias underwent repeat endomyocardial biopsy.
  • Initial biopsies were unconfirmed for myocarditis. Repeat biopsies included right ventricular (RV) and/or left ventricular (LV) sampling.
  • Histological findings were compared between initial and repeat biopsies.

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Main Results:

  • Myocarditis was confirmed on repeat biopsy in 4 of 6 patients with "borderline" findings (interstitial inflammation without myocyte necrosis) on initial biopsy.
  • None of the 22 patients with initial "borderline" findings showing myocyte hypertrophy or fibrosis had confirmed myocarditis on repeat biopsy (p = 0.0007).
  • "Borderline" myocarditis on initial biopsy was the sole predictor of myocarditis confirmation.

Conclusions:

  • Repeat endomyocardial biopsy can diagnose myocarditis in a subset of DCM patients with initially non-diagnostic biopsies.
  • RV sampling should be considered for repeat biopsy in patients with "borderline" initial findings.
  • Confirmation of myocarditis may guide treatment modification.