Malondialdehyde-modified low-density lipoprotein is a useful marker to identify patients with vulnerable plaque.
BACKGROUND
The association between elevated malondialdehyde-modified low-density lipoprotein (MDA-LDL) and plaque instability in patients with coronary artery disease (CAD) is suspected but not established. The aim of the present study was therefore to investigate the association between serum MDA-LDL and plaque characteristics on angioscopy.


RESULTS
A total of 37 consecutive patients with CAD and single-vessel disease who underwent pre-interventional angioscopy, were studied. Using angioscopy at the target lesions, the presence of yellow plaque and complex plaque was examined. Moreover, we evaluated the yellow intensity, which has been shown to have an inverse correlation with the fibrous-cap thickness of the plaques, with quantitative colorimetry to identify a thin-cap atheroma. Serum MDA-LDL in patients with thin-cap atheroma diagnosed on quantitative colorimetry was significantly higher than in patients without thin-cap atheroma (P<0.0009). Univariate logistic regression indicated that serum MDA-LDL was a predictor for thin-cap atheroma (odds ratio [OR], 1.48; 95% confidence interval [CI]: 1.10-1.97; P=0.003) and for complex plaque (OR, 1.22; 95% CI: 1.00-1.48; P=0.046). On multivariate logistic regression serum MDA-LDL was the only independent predictor for thin-cap atheroma (OR, 1.48; 95% CI: 1.10-1.97; P=0.011).


CONCLUSIONS
Using angioscopy and quantitative colorimetry, elevated MDA-LDL was confirmed to be associated with thin-cap atheroma in CAD patients.
Division of Cardiology, Nippon Medical School, Tokyo, Japan.
Kenichiro
K
Tajika
Kentaro
K
Okamatsu
Masamichi
M
Takano
Shigenobu
S
Inami
Masanori
M
Yamamoto
Daisuke
D
Murakami
Nobuaki
N
Kobayashi
Takayoshi
T
Ohba
Noritake
N
Hata
Yoshihiko
Y
Seino
Kyoichi
K
Mizuno
D000368:Aged; D017546:Angioscopy / Q000379:methods; D015415:Biomarkers / Q000097:blood; D003324:Coronary Artery Disease / Q000097:blood* / Q000473:pathology*; D005260:Female; D006801:Humans; D008077:Lipoproteins, LDL / Q000097:blood*; D008297:Male; D008315:Malondialdehyde / Q000031:analogs & derivatives* / Q000097:blood; D008875:Middle Aged; D058226:Plaque, Atherosclerotic / Q000097:blood* / Q000473:pathology*
D015415:Biomarkers; D008077:Lipoproteins, LDL; C569869:malondialdehyde-low density lipoprotein, human; D008315:Malondialdehyde