Long Qt Syndrome 16, also known as ventricular tachycardia, catecholaminergic polymorphic 6, is related to long qt syndrome 14 and long qt syndrome 15. An important gene associated with Long Qt Syndrome 16 is CALM3 (Calmodulin 3). Affiliated tissues include heart, and related phenotypes are bradycardia and perimembranous ventricular septal defect