Electrode Positions in Cardioverting Atrial Fibrillation

Inclusion Criteria: 1. Atrial fibrillation (documented on an ECG-12) 2. Able and willing to sign informed consent 3. Age ≥ 18 years 4. Anticoagulation according to guidelines (Patients with atrial fibrillation for \>48 hours will be required to have a documented weekly international normalized ratio (INR) ≥2.0 (including within 48 hours of cardioversion) or treatment with non-vitamin K oral anticoagulant for three weeks or longer. Alternatively, a transoesophageal echocardiogram documenting the absence of intracardiac thrombi is accepted and cardioversion can be performed on treatment with low molecular weight heparin). Exclusion Criteria: 1. Implanted pacemaker and/or cardioverter defibrillator (ICD) 2. Prior enrollment in the trial 3. Hemodynamically unstable atrial fibrillation 4. Untreated hyperthyroidism 5. Known or suspected pregnancy