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Revista argentina de cardiología

versión On-line ISSN 1850-3748


SINIAWSKI, Daniel A et al. Correlation between Apolipoprotein B/Apolipoprotein A1 Ratios and Total Cholesterol/HDL Cholesterol in a Healthy Population: Should Castelli Index Be Updated?. Rev. argent. cardiol. [online]. 2011, vol.79, n.1. ISSN 1850-3748.

Background The total cholesterol/HDL cholesterol ratio (TC/HDLr) was proposed as coronary risk marker about 25 years ago by Dr. William Castelli, and the target suggested was <4.5. The INTERHEART study showed that the ApoB/ApoA ratio is a superior predictor of cardiovascular events than TC/HDLr. Many laboratories in our country do not have the technology to measure apolipoproteins accurately. Objectives To determine TC/HDL-Cr values or Castelli Index (CI) corresponding to the decile 1 of the ApoB/ApoAr (0.43, odds ratio 1) of the INTERHEART study; to identify optimal cut-off point (OCP) of the CI to differentiate between subjects with a ApoB/ApoAr ≤0.43 and >0.43; and to propose an updated CI target. Material and Methods Apolipoproteins were measured by immuno-nephelometry in samples from blood donors. Simple linear regression models were made to analyze the relationship between the ApoB/ApoA and TC/HDL ratios. A ROC analysis was performed to assess the accuracy of the CI, to distinguish between subjects with ApoB/ApoAr ≤ ç0.43 or > ç0.43. Subjects with hypertension, vascular disease, diabetes, or on lipid-lowering therapy were excluded. Results A total of 283 subjects, 64% men, 31% smokers, were included. General characteristics (mean ± SD): age 41.8±14 years, BMI 26.2±4, TC 199.5±48 mg/dl, HDL 49±13 mg/dl, CI 4.31±1.3, ApoB 95.2±28 mg/dl, ApoA 157.4±32 mg/dl, ApoB/ApoAr 0.62±0.21. In the total population, correlation between ApoB/ApoAr and CI was 0.90, and the ApoB/ApoAr of 0.43 corresponded to a CI of 3.22. The area below the ROC curve of the CI to distinguish between subjects with ApoB/ApoAr ≤0.43 and >0.43 was 0.936 (CI 95% 0.897-0.975), and OCP was 3.238. Conclusion These results suggest that the CI target should be reviewed and updated to <3.25.

Palabras clave : Castelli Index; Apolipoproteins.

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