"Heavy NSAID Use Linked to Higher Dementia Risk" - Exercise, Antidepressants Both Help Neurogenesis

NSAIDs are anti-inflammatory drugs used to treat pain, inflammation, or fever. The only NSAIDs that are NOT associated with increased risk of heart attack or arrhythmia are naproxen (Aleve) or aspirin. Taking high doses of aspirin has a greater risk of GI bleed than naproxen, which is why I usually recommend naproxen.

Background:

Several past studies have shown NSAIDs delay or prevent dementia, but there have been contradictory results. Last year Neurology published a study of 49,349 patients' usage ranging from ≤1 year to ≥7 years done at Boston University and Bedford VA. They showed long term use of NSAIDs protects against Alzheimers:

Compared with no NSAID use, the relative risk of Alzheimer's disease decreased from 0.98 for ≤1 year of use (95% CI 0.95 to 1.00) to 0.76 for >5 years of use (95% CI 0.68 to 0.85).

Among patients who specifically cited use of ibuprofen, the risk of Alzheimer's disease declined from 1.03 (95% CI 1.00 to 1.06) to 0.56 (95% CI 0.42 to 0.75).

Ibuprofen came out ahead in that study perhaps because it is the most commonly used.

They also sought to answer whether NSAIDs known to suppress Aβ1-42 amyloid would more likely protect . Aβ1-42 amyloid is a major component of plaques found in Alzheimer's Disease.

Aβ1-42 amyloid suppressors include ibuprofen, diclofenac, flurbiprofen --- but as for suppressing Alzheimer's, these were found to be no different than other NSAIDs, putting that theory to rest.

Risk of dementia and Alzheimer's Disease with prior exposure to NSAIDs in an elderly community-based cohort:

This new study by Breitner et al, from the University of Washington School of Medicine was published online April 22, 2009, before the print edition in Neurology.

Their outcome contradicts earlier protective studies possibly because they started with an older cohort, healthy adults 65 and older, which "could be enriched for cases [of Alzheimer's] that would otherwise have appeared earlier."

They prospectively followed 2,736 persons in a Seattle health plan. Before starting the study, they reviewed pharmacy records as much as 17 years earlier.

Findings:

12.8% of the study participants [were] heavy NSAID users at baseline. Heavy use was defined as taking 500 or more standard daily doses over a two-year period.

Another 3.9% of participants became heavy users during follow-up.

Ibuprofen, naproxen, indomethacin, and sulindac accounted for about 80% of all NSAIDs used.

Through follow-up, 476 participants developed dementia; for 356 of them, it was Alzheimer's disease.

After controlling for age, gender, education, APOE status, hypertension, diabetes, obesity, osteoarthritis, and physical activity, the risk of developing all-cause dementia was 66% higher among heavy users than among those with little or no NSAID use (HR 1.66, 95% CI 1.24 to 2.24).

The risk of developing Alzheimer's disease was 57% higher (HR 1.57, 95% CI 1.10 to 2.23).

Strengths of the study: the community-based sample, biennial assessment of dementia, rigorous exposure classification, and large numbers of dementia cases, outweigh the limitations.

Limitations: lack of generalizability to a younger patient population, the lack of exact dosing information, and the possibility of bias from unmeasured confounders.

Can we draw conclusions on one study alone? We know that exercise is protective against Alzheimer's Disease and pain may have prevented this older age group from being active. Though they did control for that, this research needs to be supported by further studies. What is helpful is to remain as active as you can. Keep and maintain every bit of function you can and get help for depression and anxiety as they may profoundly affect memory, morbidity and mortality. For a review of the literature on the morbidity and mortality of stress and mood, refer to my post on Cognitive Behavioral Therapy and the importance of a positive outlook.

The brain makes new neurons - neurogenesis. I will write more in the future on exercise, mood, stress, brain atrophy and memory loss. Exercise improves depression and anxiety, and exercise stimulates neurogenesis. It appears that the action of antidepressants also may be to stimulate neurogenesis. Chronic low back pain has been reported to cause brain atrophy. Chronic depression leads to brain atrophy and memory loss with atrophy occurring in the hippocampus, the area essential for memory. This important publication from Vancouver reviews the topic in great detail and proposes a hypothesis: Antidepressant effects of exercise: Evidence for an adult-neurogenesis hypothesis?

Further medication is being tested to reduce neuronal cell death that leads to Alzheimer's Disease, using a very simple compound that blocks free radicals and inflammation. More on this later.

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and is not a substitute for medical advice, diagnosis or treatment

provided by a qualified health care provider.

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