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Age-Specific Impact of Atrial Fibrillation on Cardiovascular Mortality Among Japanese Men and Women (The Ibaraki Prefectural Health Study [IPHS])

      The age-specific impact of atrial fibrillation (AF) on cardiovascular diseases remains unclear. A total of 90,629 participants who were from 40 to 79 years of age in 1993 were followed up until 2013 as part of the Ibaraki Prefectural Health Study. Hazard ratios for mortality stratified by gender and age groups were calculated using Cox's proportional hazards regression models. A total of 22,794 patients (11,329 men and 11,465 women) died during the follow-up period, including 6,684 patients who died of cardiovascular causes (2,951 men and 3,733 women). On multivariable analysis, participants with AF had an increased risk of cardiovascular-related mortality compared with those without AF. Among participants aged 40 to 64 years, the adjusted hazard ratios were 3.2 (95% confidence interval [CI] 2.0 to 5.3) for men and 7.1 (95% CI 3.2 to 16.0) for women; the corresponding adjusted hazard ratios among participants aged 65 to 79 years were 3.0 (95% CI 2.2 to 4.0) for men and 3.7 (95% CI 2.5 to 5.4) for women. No significant difference in hazard ratios between age groups was found for either gender. AF was significantly associated with all-cause mortality in each age and gender group; again, no significant difference in hazard ratios between the age groups was found in terms of AF. AF may be an independent risk factor for cardiovascular and all-cause mortalities regardless of age.
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