Supraventricular tachyarrhythmias, particularly atrial fibrillation (AF) and atrial flutter (AFl), common among patients with PS, were reported in 38% of patients in the study by Murphy et al. [3], and Lopez-Sainz reported the presence of AF in 29% among 90 PRKAG2 variant carriers [9]. The gene discussed is PRKAG2; the disease is atrial flutter.