Atrial Fibrillation, Familial, 3, also known as atfb3, is related to short qt syndrome 2 and familial long qt syndrome. An important gene associated with Atrial Fibrillation, Familial, 3 is KCNQ1 (Potassium Voltage-Gated Channel Subfamily Q Member 1). Affiliated tissues include heart and heart-atrium, and related phenotypes are permanent atrial fibrillation and thromboembolic stroke