Ventricular Arrhythmias Due to Cardiac Ryanodine Receptor Calcium Release Deficiency Syndrome, also known as ryr2 calcium release deficiency syndrome, is related to idiopathic ventricular fibrillation, non brugada type and ventricular tachycardia, catecholaminergic polymorphic, 1, with or without atrial dysfunction and/or dilated cardiomyopathy. An important gene associated with Ventricular Arrhythmias Due to Cardiac Ryanodine Receptor Calcium Release Deficiency Syndrome is RYR2 (Ryanodine Receptor 2). Related phenotypes are left ventricular noncompaction cardiomyopathy and torsade de pointes