SARS-CoV-2 Myocarditis Diagnostic Probability (Troponin + MRI + ECG)
- ECG Pattern
- CMR (2018 Lake Louise Criteria)
- Days from Symptom Onset to CMR (leave blank if CMR not done)
- SARS-CoV-2 Myocarditis: Explanation and Clinical Context
In patients with COVID-19, myocardial injury is common and manifests as troponin elevation with variable ECG changes. ECG alone has low specificity for myocarditis, whereas cardiac magnetic resonance (CMR) using the 2018 Lake Louise Criteria provides high diagnostic accuracy by combining T2-based edema markers with T1/ECV/LGE evidence of inflammatory injury. Early timing matters: performing CMR within 1–2 weeks of symptom onset maximizes sensitivity, and when paired with markedly elevated troponin, diagnostic pick-up is very high. Troponin should be interpreted as a marker of injury rather than etiology; elevations >10× URL in the right clinical context strengthen probability but cannot, by themselves, establish myocarditis. This tool pragmatically synthesizes these elements to stratify probability into low, intermediate, high, and very high bands. It complements—not replaces—clinical judgment, guideline algorithms, and, when indicated, invasive testing.
Reference:
Ferreira VM, et al. J Am Coll Cardiol. 2018;72:3158–3176 (2018 Lake Louise update).
Martens P, et al. JAHA. 2023;12:e031454 (diagnostic approach).
Williams MGL, et al. JACC: Cardiovasc Imaging. 2022;15:1732–1745 (CMR <14 days + peak TnT ≥211 ng/L → ≈94% diagnostic yield).
Sandoval Y, et al. J Am Coll Cardiol. 2020;76:1244–1258 (troponin in COVID-19).
Luetkens JA, et al. Radiology: Cardiothoracic Imaging. 2019;1:e190010; Lewis AJM, et al. Cardiovasc Diagn Ther. 2020 (performance of revised LLC).
Discussion
No discussions yet. Be the first to comment.
Create Note
Notes are stored privately on your device only. No login required. Nothing is uploaded or shared.