Coronary Heart Disease Risks Associated with High Levels of HDL Cholesterol

Abstract

Background The association between high‐density lipoprotein cholesterol ( HDL‐C ) and coronary heart disease ( CHD ) events is not well described in individuals with very high levels of HDL ‐C (>80 mg/dL). Methods and Results Using pooled data from 6 community‐based cohorts we examined CHD and total mortality risks across a broad range of HDL ‐C, including values in excess of 80 mg/dL. We used Cox proportional hazards models with penalized splines to assess multivariable, adjusted, sex‐stratified associations of HDL ‐C with the hazard for CHD events and total mortality, using HDL ‐C 45 mg/dL and 55 mg/dL as the referent in men and women, respectively. Analyses included 11 515 men and 12 925 women yielding 307 245 person‐years of follow‐up. In men, the association between HDL ‐C and CHD events was inverse and linear across most HDL ‐C values; however at HDL ‐C values >90 mg/dL there was a plateau effect in the pattern of association. In women, the association between HDL ‐C and CHD events was inverse and linear across lower values of HDL ‐C, however at HDL ‐C values >75 mg/dL there were no further reductions in the hazard ratio point estimates for CHD . In unadjusted models there were increased total mortality risks in men with very high HDL ‐C, however mortality risks observed in participants with very high HDL ‐C were attenuated after adjustment for traditional risk factors. Conclusions We did not observe further reductions in CHD risk with HDL ‐C values higher than 90 mg/dL in men and 75 mg/dL in women.