Hallazgos electrocardiográficos inesperados tras cardioversión farmacológica

Brugada syndrome is a life-threatening disease and atrial fibrillation can be its first clinical manifestation. The identification of these patients is really important because some antiarrhythmic drugs should be avoided as they increase the risk of sudden death. Sodium channel blocking test allows physicians to unmask concealed Brugada syndrome and it could be useful to assess young patients with atrial fibrillation and no structural heart disease. We explain the case of a man with “lone atrial fibrillation” who developed a type 1 Brugada pattern after being given flecainide at Emergency Department.