Lipids
Thirty-six cohorts point the other way from the rumour — less dementia on statins, not more. Observational, so read it carefully.
Not yet investigated
Thirty-six cohorts point the other way from the rumour — less dementia on statins, not more. Observational, so read it carefully.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.
What we are reading
Gathered for the investigation and not yet written up. Each note says what the paper does and does not show.
This is the opposite of what the node was expected to show, and it has to be said that way round. 36 studies: statin users had LOWER dementia risk (OR 0.80, 0.75–0.86) and lower Alzheimer's risk (OR 0.68, 0.56–0.81), with no difference between men and women and none between lipophilic and hydrophilic statins. The authors' own conclusion is 'the absence of a neurocognitive risk'. The caveat is the whole design: these are OBSERVATIONAL, so healthy-user bias and confounding by indication are live — people well enough to be prescribed and to keep taking a preventive drug are not comparable to people who are not. The authors call for purpose-built RCTs. No episode should present this as proof of neuroprotection.
The other half, and the reason the rumour exists. Reports of statin-associated cognitive impairment come mainly from case reports and series; ONE RCT found simvastatin impaired some measures against placebo, while most RCTs and observational studies found a neutral or beneficial effect. Practical and testable: a trial discontinuation can reveal a temporal relationship, and switching from a lipophilic statin to a hydrophilic one (pravastatin, rosuvastatin, which cross the blood-brain barrier less) may resolve it. Their bottom line is that the effect is rare and does not justify changing practice.
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Also in Lipids
The letter
The full citation list for each investigation, the studies that didn't make the episode, and any corrections — sent the morning it publishes.
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