SCN5A and familial long QT syndrome: In a systematic study of autopsied SIDS cases Ackerman et al[27] reported an incidence of SCN5A mutations of 2.1% and most recently, in a survey of SIDS victims involving 201 Norewegian cases, approximately half of the gene variants linked to LQTS were found to be SCN5A mutations[7], which is higher than the approximately 10% incidence reported in adult LQTS patients[28].