Key result
Increased carotid IMT linked to cognitive impairment in ~70% of reviewed studies.
Why the study?
Does carotid artery intima media thickness predict cognitive impairment?
Systematic Review
Does carotid artery intima media thickness predict cognitive impairment?
Current literature shows a potential but non-definitive association between increased carotid IMT and cognitive impairment, limited by a lack of standardized measurement and definitions.
Answers are grounded in this paper and cite their sources.
Carotid IMT should not yet guide cognitive risk assessment in practice; leaves open need for standardized prospective validation.
The conversion rate of cognitive impairment to Alzheimer's disease is 1 to 25% per year. Early detection of cognitive impairment will thus become a major concern, particularly when pharmacological intervention for preventing or delaying conversion will prove effective. If simple carotid artery intima media thickness (IMT) measurements were to predict cognitive impairment, IMT could become one of the detection tools, as it is inexpensive, reliable and non-invasive. Since no review paper on this subject is available, a systematic review of the literature was performed. Twenty studies were identified evaluating the association between IMT and cognitive impairment and fourteen found a significant association after multivariate analysis. However, currently no definitive evidence of an association between increased IMT and cognitive impairment can be established. A consensus regarding the precise definition of cognitive impairment, and standardized methods to assess early cognitive impairment alongside a consensus for IMT measurement are needed in future epidemiological studies on the relationship between IMT and cognitive impairment.
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Christian Saleh (2010) conducted a systematic review in Cognitive impairment. Carotid artery intima media thickness (IMT) vs. Lower IMT was evaluated on Association between IMT and cognitive impairment. Fourteen of 20 reviewed studies found a significant association between increased carotid artery intima media thickness and cognitive impairment after multivariate analysis, though definitive evidence remains unestablished.
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