CASQ2 and catecholaminergic polymorphic ventricular tachycardia: Recent studies performed in human induced pluripotent stem cell‐derived cardiomyocytes (hiPSC‐CMs) from CPVT patients bearing mutations in either CASQ2 (D307H) or RyR2 (M4109R) showed that β‐adrenergic stimulation caused marked elevation in diastolic Ca2+, DADs, and oscillatory prepotentials (Itzhaki et al, 2012; Novak et al, 2012, 2015).