Abstract
Ischaemic stroke risk rises with the increasing cardiovascular risk factors. How atrial fibrillation (AF) incrementally contributes to the risk for ischaemic stroke with increasing age and multiple cardiovascular risk factors is unclear. In an individual patient with AF the mechanism of ischaemic stroke may be related directly to AF itself or to risk factors associated with AF. It was this study's objective to investigate incident ischaemic stroke in relation to age and increasing cardiovascular risk factor(s), and the incremental impact of AF on stroke rates. We studied a 5% random sampling from Chinese medical insurance data covering more than 10 million individuals, for the years 2001 to 2012. The rate of ischaemic stroke was calculated amongst the individuals with no prior history of ischaemic stroke, in relation to age groups (aged < 65, 65-74, ≥ 75 years old; n = 348,431, n = 56,952, n = 20,217, respectively), and increasing risk factors using the CHA2DS2-VASc score. Among the randomly sampled 425,600 individuals with total follow-up of 1,864,232 patient-years [63.8% male, mean age 60 years; 880 with AF, vs 424,720 non-AF], there were 13,242 (3.1%) ischaemic strokes after 64,834 person-years follow-up. Overall, ischaemic ...Continue Reading
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