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2014 ; 45
(9
): 2568-74
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gab.com Text
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Atrial fibrillation and cognitive decline-the role of subclinical cerebral
infarcts: the atherosclerosis risk in communities study
#MMPMID25052319
Chen LY
; Lopez FL
; Gottesman RF
; Huxley RR
; Agarwal SK
; Loehr L
; Mosley T
; Alonso A
Stroke
2014[Sep]; 45
(9
): 2568-74
PMID25052319
show ga
BACKGROUND AND PURPOSE: The mechanism underlying the association of atrial
fibrillation (AF) with cognitive decline in stroke-free individuals is unclear.
We examined the association of incident AF with cognitive decline in stroke-free
individuals, stratified by subclinical cerebral infarcts (SCIs) on brain MRI
scans. METHODS: We analyzed data from 935 stroke-free participants (mean age±SD,
61.5±4.3 years; 62% women; and 51% black) from 1993 to 1995 through 2004 to 2006
in the Atherosclerosis Risk in Communities Study, a biracial community-based
prospective cohort study. Cognitive testing (including the digit symbol
substitution and the word fluency tests) was performed in 1993 to 1995, 1996 to
1998, and 2004 to 2006 and brain MRI scans in 1993 to 1995 and 2004 to 2006.
RESULTS: During follow-up, there were 48 incident AF events. Incident AF was
associated with greater annual average rate of decline in digit symbol
substitution (-0.77; 95% confidence interval, -1.55 to 0.01; P=0.054) and word
fluency (-0.80; 95% confidence interval, -1.60 to -0.01; P=0.048). Among
participants without SCIs on brain MRI scans, incident AF was not associated with
cognitive decline. In contrast, incident AF was associated with greater annual
average rate of decline in word fluency (-2.65; 95% confidence interval, -4.26 to
-1.03; P=0.002) among participants with prevalent SCIs in 1993 to 1995. Among
participants who developed SCIs during follow-up, incident AF was associated with
a greater annual average rate of decline in digit symbol substitution (-1.51; 95%
confidence interval, -3.02 to -0.01; P=0.049). CONCLUSIONS: The association of
incident AF with cognitive decline in stroke-free individuals can be explained by
the presence or development of SCIs, raising the possibility of anticoagulation
as a strategy to prevent cognitive decline in AF.