A subgroup analysis of the NOAH – AFNET 6 trial revealed: In patients with device-detected atrial fibrillation and a prior stroke, oral anticoagulation increases bleeding without a clear reduction in stroke. This finding was presented by Prof. Paulus Kirchhof, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany, in a late-breaking clinical trials session at the annual congress of the American Heart Rhythm Society (HRS) in Boston, USA, on 19.05.2024 (1).
Device-detected atrial fibrillation (DDAF) are short and typically rare episodes of atrial fibrillation (AF) detected by pacemakers, defibrillators, and implanted loop recorders capable of continuous rhythm monitoring. Device-detected atrial fibrillation is found in every fifth patient with a cardiac implanted electronic device (2). Device-detected atrial fibrillation can lead to stroke, but the stroke risk in patients with device-detected atrial fibrillation appears lower than the stroke risk in patients with ECG-documented atrial fibrillation (1%/year).
Anticoagulation effectively prevents stroke in patients with ECG-documented AF. It is particularly effective in patients with AF and a prior stroke or transient ischemic attack (TIA) who are at high risk of recurrent stroke. In patients with a prior stroke without ECG-documented AF, oral anticoagulants mainly increase bleeding with only a weak effect on ischemic stroke.