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atrial fibrillation

A cohort study of persons with incident atrial fibrillation (AF) has found that AF after noncardiac surgery is common and comprises 13 percent of all new AF diagnoses. Postoperative AF is also associated with similar risk for stroke or transient ischemic attack (TIA) and death as AF unrelated to surgery. The findings are published in Annals of Internal Medicine.

AF occurring after noncardiac surgery may be triggered by perioperative stress and systemic inflammation in patients with predisposing comorbidities. For those who develop AF within 30 days of surgery, AF often recurs during subsequent follow-up and carries increased risks for thromboembolism and death compared with patients who had surgery but did not develop AF. It is less clear how postoperative AF compares with AF occurring outside of the operative setting for risk of both nonfatal and fatal outcomes.

Researchers from the Mayo Clinic’s Departments of Cardiovascular Medicine and Quantitative Health Sciences studied data from the Rochester Epidemiology Project (REP) for 4,231 patients with incident AF to compare the risks for ischemic stroke or TIA and other outcomes in patients with postoperative AF versus those with incident AF not associated with surgery. They found that 550 patients, or 13%, had postoperative AF as their first-ever documented AF presentation. Most of these incidents occurred within one week after surgery and the cumulative incidence of subsequent documented AF was approximately 21% at 1 year after the index periprocedural AF episode.

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