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Endomyocardial Biopsy Yield Predictor (Myocarditis Suspicion Model)

  • Days from symptom onset to planned EMB
  • CMR (Lake Louise Criteria) at or near presentation
  • Planned biopsy approach
  • Guidance / targeting method
  • Planned number of myocardial specimens
  • Acute hemodynamic instability at time of EMB
  • Endomyocardial Biopsy Yield Predictor (Myocarditis Suspicion Model): Explanation and Clinical Context
    This calculator estimates the probability that an endomyocardial biopsy (EMB) will provide a specific histopathologic or immunohistochemical diagnosis in patients with clinically suspected myocarditis. Diagnostic yield in contemporary cohorts averages around 50–55%, depending on timing, imaging, sampling site, and targeting method.

    Clinical interpretation
    Early biopsy (≤14 days), positive cardiac MRI (updated Lake Louise Criteria), LV or biventricular sampling, electroanatomic mapping, and obtaining ≥5–7 specimens all substantially improve yield. Delayed biopsy (>30 days) or right-ventricular-only sampling tends to reduce diagnostic return. The model assumes a baseline yield of 53% and applies incremental effects derived from published observational data.

    Use in practice
    Predicted yield <30% → low likelihood; optimize strategy before proceeding.
    30–60% → intermediate yield; typical for most myocarditis biopsies.
    >60% → high yield; strategy optimized (early, LV/biventricular, mapping, adequate samples).

    Reference:
    Duan X, et al. Diagnostic yield of updated indications for endomyocardial biopsy and prognostic impact. 2025. (PMC)
    Martínez-Cossiani M, et al. Diagnostic yield and safety profile of EMB in the non-transplant setting. Eur Heart J. 2023.
    Neves HAF, et al. Right or left EMB? Systematic review/meta-analysis about complications and safety. Int J Cardiol. 2024.
    Casella M, et al. Electroanatomic voltage mapping to target EMB. JACC Cardiovasc Imaging. 2023.
    ACC Expert Consensus Decision Pathway on Myocarditis. J Am Coll Cardiol. 2024.
    Lagan J, et al. Contemporary CMR in suspected myocarditis. Circulation. 2023.

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