Sammendrag
ABSTRACT
Objective To study time trends in incidence of atrial
fibrillation (AF) in the entire Norwegian population from
2004 to 2014, by age and sex, and to estimate the
prevalence of AF at the end of the study period.
Methods A national cohort of patients with AF (≥18
years) was identified from inpatient admissions with
AF and deaths with AF as underlying cause (1994–
2014), and AF outpatient visits (2008–2014) in the
Cardiovascular Disease in Norway (CVDNOR) project.
AF admissions or out-of-hospital death from AF, with
no AF admission the previous 10 years defined incident
AF. Age-standardised incidence rates (IR) and incidence
rate ratios (IRR) were calculated. All AF cases identified
through inpatient admissions and outpatient visits and
alive as of 31 December 2014 defined AF prevalence.
Results We identified 175 979 incident AF cases (30%
primary diagnosis, 69% secondary diagnosis, 0.6% outof-hospital deaths). AF IRs (95% confidence intervals)
per 100 000 person years were stable from 2004 (433
(426–440)) to 2014 (440 (433–447)). IRs were stable or
declining across strata of sex and age with the exception
of an average yearly increase of 2.4% in 18–44 yearolds: IRR 1.024 (1.014–1.034). In 2014, the prevalence
of AF in the adult population was 3.4%.
Conclusions We found overall stable IRs of AF for the
adult Norwegian population from 2004 to 2014. The
prevalence of AF was 3.4% at the end of 2014, which
is higher than reported in previous studies. Signs of an
increasing incidence of early-onset AF (
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