Discordance between lipid markers used for predicting cardiovascular risk in patients with type 2 diabetes

Non-high density lipoprotein cholesterol (non-HDL-C) is gaining importance over low density lipoprotein cholesterol (LDL-C) as cardiovascular risk marker in patients with type 2 diabetes. It represents the overall lipid burden and is a surrogate marker for the apolipoprotein B. We studied the discordance between the old (LDL-C) and the new (non-HDL-C) lipid markers in a large group of diabetes patients.

The lipid profile data of all diabetes (T2DM, aged 18-75, using oral or injectable anti diabetic agents) patients was analyzed in this study. We excluded patients with type1 diabetes, secondary forms of diabetes and gestational diabetes. Elevated lipid parameters (LDL>100mg/dL and non HDL-C>130mg/dL) were defined as per the guidelines of Adult Treatment Panel III.

The study participants (409 M:360 F) had a mean age of 47.3±12.4 years, BMI of 28.4±5.6kg/m(2) and an A1c of 8.8±2.2%. Elevated LDL-C was observed in 383 patients (49.8%) and elevated non HDL-C in 418 (54.4%) patients. Of the 383 patients with elevated LDL-C, 346 (90.3%) had corresponding elevated levels of non-HDL-C and out of 418 patients with elevated non HDL-C, 346 (83%) had elevated LDL-C. Discordance between the elevated LDL-C and non-HDL-C values were greater among patients with low triglyceride levels when compared with those with high triglycerides (Pearson's χ(2) test=67.7; P<0.001).

Our data suggest a significant discordance between the LDL-C and non-HDL-C in patients with diabetes. This discordance leads to the residual cardiovascular risk in diabetes patients.