Lowest Cholesterol Levels Associated with Higher Mortality

 

(My Notes: Below are just three examples.  It is shown over and over that patients who have the lowest levels of total cholesterol do not live as long.  This is especially the case in women.  One study in general concludes: (patients) in the lowest quartiles of total cholesterol, non-HDL cholesterol and LDL cholesterol were approximately twice as likely to die as those in the highest quartile. Consider this with the fact that one-half of all patients having their first heart attack actually have “good” or “ideal” cholesterol numbers……makes you think.)

 

http://onlinelibrary.wiley.com/doi/10.1111/j.1532-5415.2011.03593.x/abstract

Journal of the American Geriatrics Society

Volume 59, Issue 10, pages 1779–1785, October 2011

 Association Between Serum Cholesterol and Noncardiovascular Mortality in Older Age

Rachel S. Newson PhD, Janine F. Felix PhD, Jan Heeringa PhD, Albert Hofman PhD, Jacqueline C. M. Witteman PhD, Henning Tiemeier PhD

Objectives

To clarify the association between cholesterol and noncardiovascular mortality and to evaluate how this association varies across age groups.

Design

Prospective population-based cohort study.

Setting

Rotterdam, the Netherlands.

Participants

Adults aged 55 to 99 (N = 5,750).

Measurements

Participants were evaluated for total cholesterol and subfractions and followed for mortality for a median of 13.9 years. Total cholesterol and its subfractions were evaluated in relation to noncardiovascular mortality. Cox regression analyses were conducted in the total sample and within age-groups (55–64, 65–74, 75–84, ≥85).

Results

Age- and sex-adjusted analyses showed that each 1-mmol/L increase in total cholesterol was associated with an approximately 12% lower risk of noncardiovascular mortality (hazard ratio (HR) = 0.88, 95% confidence interval (CI) = 0.84–0.92, P < .001). Age group–specific analyses demonstrated that this association reached significance after the age of 65 and increased in magnitude across each subsequent decade. This was driven largely by non-high-density lipoprotein cholesterol (non-HDL-C) (HR = 0.89, 95% CI 0.85–0.93, < .001) and was partly attributable to cancer mortality. Conversely, HDL-C was not significantly associated with noncardiovascular mortality (HR = 0.92, 95% CI 0.79–1.07, P = .26).

Conclusion

Higher total cholesterol was associated with a lower risk of noncardiovascular mortality in older adults. This association varied across the late-life span and was stronger in older age groups. Further research is required to examine the mechanisms underlying this association.

 

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http://www.ncbi.nlm.nih.gov/pubmed/15673344?dopt=Abstract

J Am Geriatr Soc. 2005 Feb;53(2):219-26.

Relationship between plasma lipids and all-cause mortality in nondemented elderly.

Schupf N, Costa R, Luchsinger J, Tang MX, Lee JH, Mayeux R.

Source

G. H. Sergievsky Center, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.

Abstract

OBJECTIVES:

To investigate the relationship between plasma lipids and risk of death from all causes in nondemented elderly.

DESIGN:

Prospective cohort study.

SETTING:

Community-based sample of Medicare recipients, aged 65 years and older, residing in northern Manhattan.

PARTICIPANTS:

2267 nondemented elderly, aged 65 to 98; 672 (29.5%) white/non-Hispanic, 699 (30.7%) black/non-Hispanic, 876 (38.5%) Hispanic, and 30 (1.3%) other.

MEASUREMENTS:

Anthropometric measures: fasting plasma total cholesterol, triglyceride, high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), and non-HDL-C, body mass index, and apolipoprotein E (APOE) genotype. clinical measures: neuropsychological, neurological, medical, and functional assessments; medical history of diabetes mellitus, heart disease, hypertension, stroke, and treatment with lipid-lowering drugs. Vital status measure: National Death Index date of death. Survival methods were used to examine the relationship between plasma lipids and subsequent mortality in younger and older nondemented elderly, adjusting for potential confounders.

RESULTS:

Nondemented elderly with levels of total cholesterol, non-HDL-C, and LDL-C in the lowest quartile were approximately twice as likely to die as those in the highest quartile (rate ratio (RR)=1.8, 95% confidence interval (CI)=1.3-2.4). These results did not vary when analyses were adjusted for body mass index, APOE genotype, diabetes mellitus, heart disease, hypertension, stroke, diagnosis of cancer, current smoking status, or demographic variables. The association between lipid levels and risk of death was attenuated when subjects with less than 1 year of follow-up were excluded (RR=1.4, 95% CI=1.0-2.1). The relationship between total cholesterol, non-HDL-C, HDL-C, and triglycerides and risk of death did not differ for older (>or=75) and younger participants (>75), whereas the relationship between LDL-C and risk of death was stronger in younger than older participants (RR=2.4, 95% CI=1.2-4.9 vs RR=1.6, 95% CI=1.02-2.6, respectively). Overall, women had higher mean lipid levels than men and lower mortality risk, but the risk of death was comparable for men and women with comparable low lipid levels.

CONCLUSION:

Low cholesterol level is a robust predictor of mortality in the nondemented elderly and may be a surrogate of frailty or subclinical disease. More research is needed to understand these associations.

 

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http://www.ncbi.nlm.nih.gov/pubmed/21951982

J Eval Clin Pract. 2012 Feb;18(1):159-68

Is the use of cholesterol in mortality risk algorithms in clinical guidelines valid? Ten years prospective data from the Norwegian HUNT 2 study.

Petursson H, Sigurdsson JA, Bengtsson C, Nilsen TI, Getz L.

Source

Research Unit of General Practice, Department of Public Health and General Practice, Norwegian University of Science and Technology (NTNU), Trondheim, Norway. halfdanpe@gmail.com

Abstract

RATIONALE, AIMS AND OBJECTIVES:

Many clinical guidelines for cardiovascular disease (CVD) prevention contain risk estimation charts/calculators. These have shown a tendency to overestimate risk, which indicates that there might be theoretical flaws in the algorithms. Total cholesterol is a frequently used variable in the risk estimates. Some studies indicate that the predictive properties of cholesterol might not be as straightforward as widely assumed. Our aim was to document the strength and validity of total cholesterol as a risk factor for mortality in a well-defined, general Norwegian population without known CVD at baseline.

METHODS:

We assessed the association of total serum cholesterol with total mortality, as well as mortality from CVD and ischaemic heart disease (IHD), using Cox proportional hazard models. The study population comprises 52 087 Norwegians, aged 20-74, who participated in the Nord-Trøndelag Health Study (HUNT 2, 1995-1997) and were followed-up on cause-specific mortality for 10 years (510 297 person-years in total).

RESULTS:

Among women, cholesterol had an inverse association with all-cause mortality [hazard ratio (HR): 0.94; 95% confidence interval (CI): 0.89-0.99 per 1.0 mmol L(-1) increase] as well as CVD mortality (HR: 0.97; 95% CI: 0.88-1.07). The association with IHD mortality (HR: 1.07; 95% CI: 0.92-1.24) was not linear but seemed to follow a ‘U-shaped’ curve, with the highest mortality <5.0 and ≥7.0 mmol L(-1) . Among men, the association of cholesterol with mortality from CVD (HR: 1.06; 95% CI: 0.98-1.15) and in total (HR: 0.98; 95% CI: 0.93-1.03) followed a ‘U-shaped’ pattern.

CONCLUSION:

Our study provides an updated epidemiological indication of possible errors in the CVD risk algorithms of many clinical guidelines. If our findings are generalizable, clinical and public health recommendations regarding the ‘dangers’ of cholesterol should be revised. This is especially true for women, for whom moderately elevated cholesterol (by current standards) may prove to be not only harmless but even beneficial.

 

LDL

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