title: All types of atrial fibrillation in the setting of myocardial infarction are associated with impaired outcome.
abstract: To evaluate 90-day cardiovascular outcome in patients after myocardial infarction (MI) in relation to different subtypes of atrial fibrillation (AF) and MI.
  
  
  
  We studied 155 071 hospital survivors of MI between 2000 and 2009 in Swedish registries. AF subtypes were defined according to history of AF and in-hospital ECG recordings. Clinical outcomes were evaluated with multivariable Cox models.
  
  
  
  AF was documented in 24 023 (15.5%) cases. The AF subtypes were new-onset AF with sinus rhythm at discharge (3.7%), new-onset AF with AF at discharge (3.9%), paroxysmal AF (4.9%) and chronic AF (3.0%). The event rate per 100 person-years for the composite cardiovascular outcome (all-cause mortality, MI or ischaemic stroke) was 90.9 in patients with any type of AF versus 45.2 in patients with sinus rhythm, adjusted hazard ratio with 95% CI (HR) 1.28 (1.19 to 1.37). There were no significant differences in the composite cardiovascular outcome between AF subtypes. AF was associated with higher risk of mortality, HR 1.59 (1.41 to 1.80), reinfarction, HR 1.14 (1.05 to 1.24), and ischaemic stroke, HR 2.29 (1.92 to 2.74), respectively. In subgroup analysis, AF was associated with a higher risk of composite cardiovascular outcome in the non-ST-elevation myocardial infarction (NSTEMI) and ST-elevation myocardial infarction (STEMI) cohort, HR 1.24 (1.13 to 1.36) and HR 1.34 (1.21 to 1.48), respectively, with p value for interaction=0.23.
  
  
  
  AF is common in the setting of MI and is associated with a higher risk of composite cardiovascular outcome and the individual components; mortality, reinfarction and ischaemic stroke, respectively. No major difference in outcome was observed between AF subtypes. No difference in outcome for AF was observed between the NSTEMI and STEMI cohort.
authors.affiliation: Uppsala Clinical Research Center and Department of Medical Sciences, Cardiology, Uppsala University, Uppsala, Sweden.
authors.forename: Gorav
authors.initials: G
authors.lastname: Batra
authors.affiliation: Uppsala Clinical Research Center and Department of Medical Sciences, Cardiology, Uppsala University, Uppsala, Sweden.
authors.forename: Bodil
authors.initials: B
authors.lastname: Svennblad
authors.affiliation: Uppsala Clinical Research Center and Department of Medical Sciences, Cardiology, Uppsala University, Uppsala, Sweden.
authors.forename: Claes
authors.initials: C
authors.lastname: Held
authors.affiliation: Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Tomas
authors.initials: T
authors.lastname: Jernberg
authors.affiliation: Sahlgrenska Academy, University of Gothenburg and AstraZeneca, Gothenburg, Sweden.
authors.forename: Per
authors.initials: P
authors.lastname: Johanson
authors.affiliation: Uppsala Clinical Research Center and Department of Medical Sciences, Cardiology, Uppsala University, Uppsala, Sweden.
authors.forename: Lars
authors.initials: L
authors.lastname: Wallentin
authors.affiliation: Uppsala Clinical Research Center and Department of Medical Sciences, Cardiology, Uppsala University, Uppsala, Sweden.
authors.forename: Jonas
authors.initials: J
authors.lastname: Oldgren
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation / Q000175:diagnosis / Q000453:epidemiology* / Q000401:mortality / Q000628:therapy; D002545:Brain Ischemia / Q000453:epidemiology; D002423:Cause of Death; D015897:Comorbidity; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D000072658:Non-ST Elevated Myocardial Infarction / Q000175:diagnosis / Q000453:epidemiology* / Q000401:mortality / Q000628:therapy; D011379:Prognosis; D016016:Proportional Hazards Models; D012008:Recurrence; D012042:Registries; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D000072657:ST Elevation Myocardial Infarction / Q000175:diagnosis / Q000453:epidemiology* / Q000401:mortality / Q000628:therapy; D020521:Stroke / Q000453:epidemiology; D013548:Sweden / Q000453:epidemiology; D013997:Time Factors