A gentleman in his 50s presented with episodes of intermittent palpitations which were self-limiting. His symptoms were not related to exertion and had short duration with sudden onset and offset. He had no prior comorbidities and denied history of syncope. Cardiovascular system examination was unremarkable. Baseline electrocardiogram is shown in Fig. 1A. The electrocardiogram during an episode of palpitations requiring urgent hospitalization is shown in Fig. 1B. He was treated with intravenous amiodarone infusion and subsequently switched to oral anti arrhythmic medications.