Acute Cardioversion Versus Wait And See-approach for Symptomatic Atrial Fibrillation in the Emergency Department

Inclusion Criteria: * ECG with atrial fibrillation at the emergency department * Heart rate \> 70bpm * Symptoms most probable due to atrial fibrillation * Duration of symptoms \< 36 hours * \> 18 years of age * Able and willing to sign informed consent * Able and willing to use MyDiagnostick Exclusion Criteria: * Signs of myocardial infarction on ECG * Hemodynamic instability (systolic blood pressure \< 100mm Hg, heart rate \> 170 bpm) * Presence of pre-excitation syndrome * History of Sick Sinus Syndrome * History of unexplained syncope * History of persistent AF (episode of AF lasting more than 48 hours) * Acute heart failure * Currently enrolled in another clinical trial * Deemed unsuitable for participation by attending physician