Key result
Light's criteria routinely misclassify normal pericardial fluid as an exudate.
Why the study?
The normal composition of pericardial fluid is ill-defined and there is no established methodology or reference values to assess pericardial fluid composition.
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Risk of misclassifying normal pericardial fluid as exudate using pleural criteria; leaves open pericardial-specific diagnostic standards.
Fender et al. (2021) conducted an editorial in Without pericardial disease (undergoing elective open-heart surgery) (n=120). Normal physiological pericardial fluid analysis vs. Pleural fluid transudate criteria was evaluated on Normal reference values for physiological pericardial fluid biochemical and cellular composition. Normal physiological pericardial fluid is rich in protein, lactate dehydrogenase, and nucleated cells, meaning that normal specimens would be routinely misclassified as exudates if evaluated using Light's criteria for pleural fluid.
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