Myocardial Edema Ratio (MER) Calculator
- 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.
Reference:
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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