Such an overlapping clinical phenotype is also observed in calmodulin‐related inherited arrhythmia (Makita et al, 2014), as well as in KCNJ2 mutations causing Andersen‐Tawil syndrome, which can present as LQTS or CPVT phenocopies (Kimura et al, 2012). The gene discussed is KCNJ2; the disease is catecholaminergic polymorphic ventricular tachycardia.