ACTA MEDICA MEDITERRANEA, cilt.32, sa.6, ss.1899-1903, 2016 (SCI-Expanded)
Holt-Oram syndrome (HOS) is a heart-upper limb malformation complex with an autosomal dominant inheritance and near-complete penetrance but variable expression. Holt and Oram first described this syndrome in 1960. Approximately 40% of cases represent new mutations. The syndrome is associated with defective development of cardiac structures that results in atrial septal defect (ASD), most commonly the secundum type; heart block of varying degree; or both.