Accuracy of low-density lipoprotein cholesterol estimation at very low levels View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-12

AUTHORS

Renato Quispe, Aditya Hendrani, Mohamed B. Elshazly, Erin D. Michos, John W. McEvoy, Michael J. Blaha, Maciej Banach, Krishnaji R. Kulkarni, Peter P. Toth, Josef Coresh, Roger S. Blumenthal, Steven R. Jones, Seth S. Martin

ABSTRACT

BACKGROUND: As the approach to low-density lipoprotein cholesterol (LDL-C) lowering becomes increasingly intensive, accurate assessment of LDL-C at very low levels warrants closer attention in individualized clinical efficacy and safety evaluation. We aimed to assess the accuracy of LDL-C estimation at very low levels by the Friedewald equation, the de facto clinical standard, and compare its accuracy with a novel, big data-derived LDL-C estimate. METHODS: In 191,333 individuals with Friedewald LDL-C < 70 mg/dL, we compared the accuracy of Friedewald and novel LDL-C values in relation to direct measurements by Vertical Auto Profile ultracentrifugation. We examined differences (estimate minus ultracentrifugation) and classification according to levels initiating additional safety precautions per clinical practice guidelines. RESULTS: Friedewald values were less than ultracentrifugation measurement, with a median difference (25th to 75th percentile) of -2.4 (-7.4 to 0.6) at 50-69 mg/dL, -7.0 (-16.2 to -1.2) at 25-39 mg/dL, and -29.0 (-37.4 to -19.6) at < 15 mg/dL. The respective values by novel estimation were -0.1 (-1.5 to 1.3), -1.1 (-2.5 to 0.3), and -2.7 (-4.9 to 0.0) mg/dL. Among those with Friedewald LDL-C < 15, 15 to < 25, and 25 to < 40 mg/dL, the classification was discordantly low in 94.9%, 82.6%, and 59.9% of individuals as compared with 48.3%, 42.4%, and 22.4% by novel estimation. CONCLUSIONS: Estimation of even lower LDL-C values (by Friedewald and novel methods) is even more inaccurate. More often than not, a Friedewald value < 40 mg/dL is underestimated, which translates into unnecessary safety alarms that could be reduced in half by estimation using our novel method. More... »

PAGES

83

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12916-017-0852-2

DOI

http://dx.doi.org/10.1186/s12916-017-0852-2

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1084954520

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28427464


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