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CHADS-65 is a score that is positive if the person is over 65 years, has diabetes, has high blood pressure, has heart failure, or has had a stroke or TIA.[1] For those with atrial fibrillation who have one of these criteria anticoagulation is generally recommended.[1]

In those who have an episode of atrial fibrillation for 12 to 48 hours, if they have either 0 or 1 criteria, they may be cardioverted safely.[1] Whether or not those with a score of 0 should be anticoagulated for 4 weeks after cardioversion is controversial; though may be carried out on a case by case basis as of 2021.[1]


  1. 1.0 1.1 1.2 1.3 Stiell, IG; de Wit, K; Scheuermeyer, FX; Vadeboncoeur, A; Angaran, P; Eagles, D; Graham, ID; Atzema, CL; Archambault, PM; Tebbenham, T; McRae, AD; Cheung, WJ; Parkash, R; Deyell, MW; Baril, G; Mann, R; Sahsi, R; Upadhye, S; Brown, E; Brinkhurst, J; Chabot, C; Skanes, A (September 2021). "2021 CAEP Acute Atrial Fibrillation/Flutter Best Practices Checklist". CJEM. 23 (5): 604–610. doi:10.1007/s43678-021-00167-y. PMID 34383280.