Colchicine After Electrocardioversion for Atrial Fibrillation

Inclusion Criteria: * Age \>18 years * ECG-documented AF prior to ECV * Successful ECV with conversion of AF to sinus rhythm with persistent sinus rhythm ≥30 minutes after ECV * Ability to give written informed consent Exclusion Criteria: * AF persistence after cardioversion or early AF recurrence within 30 minutes after ECV * Any other rhythm than AF before cardioversion * Pulmonary vein isolation within 3 months prior to ECV or pulmonary vein isolation planned within 3 months after ECV * Known intolerance or hypersensitivity to Colchicine * Any other absolute indication for Colchicine intake * Intake of a strong inhibitor of CYP3A4 or P-Glycoprotein (clarithromycin, erythromycin, telithromycin, cyclosporine, ketoconazole or itraconazole) * Serious gastrointestinal disease (severe gastritis or diarrhea) * Clinically overt hepatic disease * Severe renal disease (eGFR\< 30ml/min/1.73m2) * Clinically significant blood dyscrasia (e.g., myelodysplasia) * Significant immunosuppression (e.g. due to transplantation or rheumatic disease) * Pregnant or breastfeeding women, or women of child-bearing potential who do not use a highly effective form of birth control * Life expectancy \<1 year