LMNA and familial dilated cardiomyopathy: Arbustini et al. (2002) showed that approximately 33% of patients with AVB and cardiomyopathy carries a LMNA mutation. For this reason, screening for LMNA mutations in young patients with idiopathic DCM, especially when it is associated with atrial arrhythmias and/or AVB, is important for prognosis and genetic counseling.