Mutation in LMNA accounts for 10% of Dilated Cardiomyopathy (DCM). It is characterised by progressive conduction system disease, arrhythmia and systolic impairment, lamin A/C heart disease is the most malignant gene common in DCMs especially in man. It is likely to be an under-recognised cause of this cardiomyopathy. In certain clinical scenarios, particularly familial DCM with early conduction disease, the probability of finding an LMNA mutation may be quite high.