Keywords: AF, atrial fibrillation; CLL, chronic lymphocytic leukemia; ICD, implantable cardioverter-defibrillator; VA, ventricular arrhythmia; VT, ventricular tachycardia; WM, Waldenstrom macroglobulinemia; Waldenstrom macroglobulinemia; ibrutinib; ventricular tachycardia.