Relationship between statins and cognitive decline more complex than thought

November 05, 2007

INDIANAPOLIS - Previous explorations of a link between statins, a cholesterol lowering medication, and cognitive decline have produced inconsistent results. New research reveals that the relationship between statin use and cognitive decline appears even more complex than had been thought.

In a three year epidemiological study, researchers from the Indiana University School of Medicine and the Regenstrief Institute, Inc. have found an association of statin use with less cognitive decline in elderly African Americans and report that, surprisingly, the association is even stronger for those who had discontinued use than for continuous users. Their findings are published in the Nov. 6 issue of Neurology.

In 2001 and again in 2004, the IU School of Medicine researchers evaluated 1146 African Americans aged 70 and older living in Indianapolis testing them in various cognitive areas including language, attention and calculation, memory and orientation. The researchers also compared use of statins and whether, if used, they were taken consistently. While cognitive decline in statin users was less than those who did not take statins, those who continued to take statins from 2001 to 2004 had greater cognitive decline than those who were taking statins in 2001 but were no longer taking them in 2004. Study participants who discontinued statin use did not differ from those who continued to use statins in any other health, demographic, clinical or biochemical characteristics.

If statin use were directly associated with a reduction in cognitive decline, continuously taking statins would presumably produce the greatest effect. The study authors say that in light of their findings that the association between statins and decreased cognitive decline is more complex than previously realized, carefully designed randomized clinical trials of statins are needed to provide definitive answers to their potential role in dementia prevention.

"Statin use plays an important role in the prevention of cardiovascular disease. And there may be a link between cardiovascular risk factors and risk factors for cognitive decline and Alzheimer disease. This is just one area that needs to be explored," said Kathleen S. Hall, Ph.D, senior author of the study. A psychiatric epidemiologist, she is an associate professor of psychiatry at the IU School of Medicine and an affiliated scientist of the Regenstrief Institute.

Dr. Hall is the principal investigator of the Indianapolis - Ibadan comparative epidemiological project, a study designed to identify potentially modifiable risk factors for Alzheimer disease by comparing the disease in two populations from a developed and developing country--African Americans living in Indianapolis and Yoruba living in Ibadan, Nigeria.

"We know that taking statin medication can protect against cardiovascular events such as heart attacks by lowering blood cholesterol. The question at hand is what effects do these medications have on brain function. Our study along with others shows promising results but larger controlled studies are needed," said Stanley Szwast, M.D., a fourth year psychiatry resident at the Indiana University School of Medicine and first author of the study.
-end-
In addition to Dr. Hall and Dr. Szwast, other authors of the Neurology study are Hugh Hendrie, MB, ChB; DSc of the IU School of Medicine and the Regenstrief Institute, Kathleen Lane, M.S.; Sujuan Gao, Ph.D.; Stanley Taylor, M.A.; Frederick Unverazgt, Ph.D.; Jill Murrell, Ph.D.; Mark Deeg, M.D., Ph.D; and Martin Farlow, M.D. of the IU School of Medicine and Adesola Ogunniyi, M.D. of the University of Ibadan, Nigeria.

The study was funded by the National Institute on Aging.

Indiana University

Related Statins Articles from Brightsurf:

Being in treatment with statins reduces COVID-19 mortality by 22% to 25%
A research by the Universitat Rovira i Virgili (URV) and Pere Virgili Institut (IISPV) led by LluĂ­s Masana has found that people who are being treated with statins have a 22% to 25% lower risk of dying from COVID-19.

Twitter data research reveals more about what patients think about statins
More than one in seven people taking statins -- prescribed to lower cholesterol levels -- believed that meant they could still eat unhealthy foods, a new study shows.

Statins starve cancer cells to death
More than 35 million Americans take statin drugs daily to lower their blood cholesterol levels.

Statins linked to higher diabetes risk
Individuals who take cholesterol-lowering statins may be at higher risk for developing high blood sugar levels, insulin resistance, and eventually type 2 diabetes, according to an analysis published in the British Journal of Clinical Pharmacology.

Statins could protect against motor neurone disease
High cholesterol has been found to be a possible risk factor for the development of motor neurone disease (MND), according to a large study of genetic data led in the UK by Queen Mary University of London, in collaboration with the National Institutes of Health in the USA.

Statins are more effective for those who follow the Mediterranean diet
For those who have already had a heart attack or a stroke, the combination of statins and Mediterranean Diet appears to be the most effective choice to reduce the risk of mortality, especially from cardiovascular causes.

Statins have low risk of side effects
Cholesterol-lowering statin drugs are associated with a low risk of side effects.

Statins overprescribed for primary prevention
Taking cholesterol-lowering drugs, or statins, as a preventive measure can reduce the risk of cardiovascular disease.

Many older adults do not take prescribed statins properly
In a British Journal of Clinical Pharmacology study of older adults prescribed statins, first-year nonadherence and discontinuation rates were high.

Statins show little promise for conditions other than heart disease
Medicines commonly prescribed to reduce people's risk of heart attack may have limited use for treating other diseases, research suggests.

Read More: Statins News and Statins Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.