Cardiac Arrhythmia Syndrome, with or Without Skeletal Muscle Weakness, also known as ventricular tachycardia, catecholaminergic polymorphic, 5, with or without muscle weakness, is related to catecholaminergic polymorphic ventricular tachycardia 5. An important gene associated with Cardiac Arrhythmia Syndrome, with or Without Skeletal Muscle Weakness is TRDN (Triadin). Affiliated tissues include skeletal muscle and heart, and related phenotypes are polymorphic ventricular tachycardia and premature ventricular contraction