Early Atrial Fibrillation During Acute Myocardial Infarction May Not Be an Indication for Long-Term Anticoagulation

Michal Axelrod, Harel Gilutz, Ygal Plakht, Dan Greenberg, Lena Novack

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Patients with new-onset of atrial fibrillation (NOAF) during acute myocardial infarction (AMI) currently receive long-term oral anticoagulation. The risk for stroke of “early” versus “late” onset of atrial fibrillation (AF) has not been elucidated. Consecutively, AMI patients admitted to a tertiary medical center were analyzed. We excluded patients with preexisting AF, AMI onset ≥24 hours prior to admission, significant valvular disease, fever >38.5°C, in-hospital death, or coronary artery bypass graft. Atrial fibrillation was verified by electrocardiography and medical records. Overall 7061 patients were included, 1.4% developed “early-paroxysmal AF (PAF)” that resolved within 24 hours of admission and 2.5% had “late-AF” beyond the first 24 hours. Median follow-up was ≈6 years. Primary end points included ischemic stroke and all-cause mortality. Stroke rates were higher only in patients with late-AF versus no-AF but not in the early-PAF: 10.6% versus 4.2%, 5.3%, respectively (P <.001). Death rates were higher in patients with late-AF and early-PAF versus no-AF: 55.3%, 43.2%, and 29.2%, respectively (P <.001). Congestive heart failure, hypertension, age ≥75, diabetes mellitus, a stroke or transient ischemic attack, vascular disease, age 65-74, female (CHA2DS2-VASc) score underestimated stroke risk in the late-AF group. In conclusion, the study generates the hypothesis that patients with early-PAF may not have a high stroke risk questioning the indication for long-term anticoagulation.

Original languageEnglish
Pages (from-to)559-566
Number of pages8
JournalAngiology
Volume71
Issue number6
DOIs
StatePublished - 1 Jul 2020

Keywords

  • acute myocardial infarction
  • mortality
  • new-onset early atrial fibrillation
  • stroke

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