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Articles by Rachel H. Mackey
Total Records ( 2 ) for Rachel H. Mackey
  James D. Otvos , Samia Mora , Irina Shalaurova , Philip Greenland , Rachel H. Mackey and David C. Goff Jr.
 

Background

The amount of cholesterol per low-density lipoprotein (LDL) particle is variable and related in part to particle size, with smaller particles carrying less cholesterol. This variability causes concentrations of LDL cholesterol (LDL-C) and LDL particles (LDL-P) to be discordant in many individuals.

Methods

LDL-P measured by nuclear magnetic resonance spectroscopy, calculated LDL-C, and carotid intima-media thickness (IMT) were assessed at baseline in the Multi-Ethnic Study of Atherosclerosis, a community-based cohort of 6814 persons free of clinical cardiovascular disease (CVD) at entry and followed for CVD events (n = 319 during 5.5-year follow-up). Discordance, defined as values of LDL-P and LDL-C differing by ≥12 percentile units to give equal-sized concordant and discordant subgroups, was related to CVD events and to carotid IMT in models predicting outcomes for a 1 SD difference in LDL-C or LDL-P, adjusted for age, gender, and race.

Results

LDL-C and LDL-P were associated with incident CVD overall: hazard ratios (HR 1.20, 95% CI [CI] 1.08−1.34; and 1.32, 95% CI 1.19−1.47, respectively, but for those with discordant levels, only LDL-P was associated with incident CVD (HR 1.45, 95% CI 1.19−1.78; LDL-C HR 1.07, 95% CI 0.88−1.30). IMT also tracked with LDL-P rather than LDL-C, ie, adjusted mean IMT of 958, 932, and 917 μm in the LDL-P > LDL-C discordant, concordant, and LDL-P < LDL-C discordant subgroups, respectively, with the difference persisting after adjustment for LDL-C (P = .002) but not LDL-P (P = .60).

Conclusions

For individuals with discordant LDL-C and LDL-P levels, the LDL-attributable atherosclerotic risk is better indicated by LDL-P.

  W. Virgil Brown , Benjamin J. Ansell , Rachel H. Mackey and Peter P. Toth
  One of the most difficult and confusing issues for clinical lipidologists and physicians in general has been the management of low concentrations of high-density lipoprotein cholesterol. We know this to be a very powerful predictor of risk in scores of community-based and clinical trial cohorts. Raising this number in many patients would seem to provide a great therapeutic opportunity, but so far this concept has been very difficult to prove. I have been joined for this discussion by a cardiovascular epidemiologist, Dr. Rachel Mackey, from the University of Pittsburgh and two clinical lipidologists who have studied and written in depth about this problem. These are Dr. Benjamin Ansell from the University of California in Los Angeles and Dr. Peter Toth from Johns Hopkins University School of Medicine. Our objective in this discussion is to give primary care clinicians our thoughts about the recent research findings and the implications of these data on the best clinical practice.
 
 
 
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