Background: Although increased circulating levels of malondialdehyde-modified low-density lipoprotein (MDA-LDL) are associated with coronary artery disease (CAD), there is no direct evidence that increased MDA-LDL is a prognostic factor for CAD.
Methods: Forty-two patients (20 diabetic and 22 non-diabetic patients) who underwent percutaneous coronary intervention (PCI) were enrolled, and their baseline MDA-LDL levels were determined by immunoassay. Follow-up coronary angiography was performed at 2 to 7 months post-PCI. The patients were then divided into 2 groups, with in-stent restenosis (ISR) (n=13) and without ISR (n=29), and the baseline MDA-LDL levels were compared. We also studied 34 diabetics with CAD for up to 57 months until the onset of the next coronary event.
Results: In the diabetic patients, the mean MDA-LDL level was significantly higher in those with ISR than in those without ISR (151+/-61 vs. 90+/-26 U/l, p=0.010). A baseline MDA-LDL value of 110 U/l for differentiating between diabetics with and without ISR was defined as the cut-off value. Kaplan-Meier analysis demonstrated that a circulating MDA-LDL of ≥ 110 U/l correlated significantly with a higher prevalence of cardiac events than MDA-LDL <110 U/l (p=0.032).
Conclusions: Circulating MDA-LDL is a useful prognostic marker for future cardiac event in diabetic patients with CAD.
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