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Clinical contextWhy this tool matters and how to interpret it
Understand the result,
not just the number.
Myocardial Edema Ratio (MER): Explanation and Clinical Context The Myocardial Edema Ratio (MER) is a quantitative index derived from T2-weighted cardiac MRI images, calculated as the ratio of myocardial signal intensity (SI) to skeletal muscle SI. It is used to identify myocardial edema, commonly observed in acute myocardial injury such as myocarditis, acute myocardial infarction, or inflammatory cardiomyopathies. A MER > 2.0 is generally considered indicative of significant myocardial edema.
The MER provides a standardized method for detecting edema, allowing for reproducible assessment and correlation with clinical severity. This tool aids clinicians in early diagnosis, risk stratification, and monitoring response to therapy in patients with myocardial inflammation.
Evidence & references1 primary source mapped
- Source 1
Friedrich MG, Sechtem U, Schulz-Menger J, et al. Cardiovascular Magnetic Resonance in Myocarditis: A JACC White Paper. J Am Coll Cardiol. 2009;53(17):1475-1487. doi:10.1016/j.jacc.2009.02.007
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