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Incidence of atrial fibrillation in whites and African-Americans: the Atherosclerosis Risk in Communities (ARIC) study.

TitleIncidence of atrial fibrillation in whites and African-Americans: the Atherosclerosis Risk in Communities (ARIC) study.
Publication TypeJournal Article
Year of Publication2009
AuthorsAlonso A, Agarwal SK, Soliman EZ, Ambrose M, Chamberlain AM, Prineas RJ, Folsom AR
JournalAm Heart J
Volume158
Issue1
Pagination111-7
Date Published2009 Jul
ISSN1097-6744
KeywordsAfrican Americans, Atherosclerosis, Atrial Fibrillation, Cohort Studies, Cross-Sectional Studies, Electrocardiography, European Continental Ancestry Group, Female, Follow-Up Studies, Humans, Incidence, Male, Mass Screening, Middle Aged, Prospective Studies, Risk Assessment, Signal Processing, Computer-Assisted, United States
Abstract

OBJECTIVES: To define the incidence and cumulative risk of atrial fibrillation (AF) in a population-based cohort of whites and African Americans.

BACKGROUND: African-Americans reportedly have a lower risk of AF than whites despite their higher exposure to AF risk factors. However, precise estimates of AF incidence in African Americans have not been previously published.

METHODS: We studied the incidence of AF in the Atherosclerosis Risk in Communities (ARIC) study, which has followed up 15,792 men and women 45 to 65 years of age at baseline from 4 communities in the United States since 1987. Atrial fibrillation cases were identified from electrocardiograms conducted at baseline and 3 follow-up visits, and from hospitalizations and death certificates through the end of 2004. During follow-up, 1,085 new cases of AF were identified (196 in African Americans, 889 in whites).

RESULTS: Crude incidence rates of AF were 6.7, 4.0, 3.9, and 3.0 per 1,000 persons per year in white men, white women, African-American men, and African-American women, respectively. Increasing age was exponentially associated with an elevated risk of AF. Compared to whites, African-Americans had a 41% (95% CI: 8%-62%) lower age- and sex-adjusted risk of being diagnosed with AF. The cumulative risk of AF at 80 years of age was 21% in white men, 17% in white women, and 11% in African-American men and women.

CONCLUSION: In this population-based cohort, African Americans presented a lower risk of AF than whites. Still, the burden of AF among the former is substantial, with 1 in 9 receiving a diagnosis of AF before 80 years of age.

DOI10.1016/j.ahj.2009.05.010
Alternate JournalAm Heart J
PubMed ID19540400
PubMed Central IDPMC2720573
Grant ListN01 HC055022 / HC / NHLBI NIH HHS / United States
T32 HL007779-15 / HL / NHLBI NIH HHS / United States
N01 HC055018 / HC / NHLBI NIH HHS / United States
N01HC55015 / HL / NHLBI NIH HHS / United States
N01 HC055019 / HC / NHLBI NIH HHS / United States
T32 HL007779 / HL / NHLBI NIH HHS / United States
N01 HC055015 / HC / NHLBI NIH HHS / United States
N01 HC055021 / HC / NHLBI NIH HHS / United States
N01 HC055020 / HC / NHLBI NIH HHS / United States
N01 HC055016 / HC / NHLBI NIH HHS / United States