Is elevated high-density lipoprotein cholesterol always good for coronary heart disease?
BACKGROUND
High-density lipoprotein (HDL) could enhance inflammation in atherogenesis when inflammatory response is present, and the activity of paraoxonase and antioxidant in HDL in the elderly is significantly decreased. There might be a different role for high-density lipoprotein cholesterol (HDL-C) between different age groups in patients with coronary heart disease (CHD).


METHODS
For this study, 225 inpatients with CHD (coronary atherosclerosis stenosis >/= 50% on >/= 1 major coronary arteries by coronary angiography), and 80 without CHD; 120 resting unstable angina patients, and 68 with stable angina were consecutively recruited. Risk factors were analyzed for CHD and resting unstable angina.


RESULTS
High-density lipoprotein cholesterol in resting unstable angina was higher than that in stable angina (1.24 +/- 1.05 versus 1.05 +/- 0.29 mmol/L, p = 0.032). After adjustment for age, sex, physical inactivity, hypertension, diabetes, C-reactive protein, triglycerides, total cholesterol (TC) and low-density lipoprotein cholesterol (LDL-C) the adjusted odds ratio (OR) (95% CI) of resting unstable angina was 10.19 (2.18-47.6, p = 0.003) for HDL-C. Risk factors were further investigated in different age groups. Adjusted OR of CHD associated with HDL-C in < 55-year-old group was 0.09 (0.01-0.66, p = 0.018), in >/= 55-year-old group it was 0.55 (0.08-3.82, p > 0.05). Adjusted OR of resting unstable angina associated with high HDL-C was 19.24 (2.86-129.4, p = 0.002) in patients aged >/= 55 years.


CONCLUSIONS
Elevated HDL-C might be an independent risk factor for resting unstable angina, even though HDL-C could play a much more important role in protection against coronary stenosis in younger or middle-aged persons.
Sun
Yuhua
Y
Cardiovascular Institute and Fu Wai Heart Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Disease Control and Research, Beijing, China.
Yang
Yuejin
Y
Pei
Weidong
W
Wu
Yongjian
Y
Zhao
Jinglin
J
D000368:Aged; D000789:Angina, Unstable / Q000473:pathology; D000975:Antioxidants / Q000378:metabolism; D043303:Aryldialkylphosphatase / Q000096:biosynthesis; D001794:Blood Pressure; D002097:C-Reactive Protein / Q000378:metabolism; D002784:Cholesterol / Q000378:metabolism; D008076:Cholesterol, HDL / Q000096:biosynthesis*; D003324:Coronary Artery Disease / Q000473:pathology; D003327:Coronary Disease / Q000097:blood* / Q000378:metabolism*; D005260:Female; D006801:Humans; D007249:Inflammation; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D012044:Regression Analysis; D012307:Risk Factors
D000975:Antioxidants; D008076:Cholesterol, HDL; D002097:C-Reactive Protein; D002784:Cholesterol; D043303:Aryldialkylphosphatase