<unk> s are the most common congenital cardiac abnormalities. They are found in 30-60% of all newborns with a congenital heart defect, or about 2-6 per 1000 births. During heart formation, when the heart begins life as a hollow tube, it begins to partition, forming septa. If this does not occur properly it can lead to an opening being left within the<unk>  septum. It is debatable whether all those defects are true heart defects, or if some of them are normal phenomena, since most of the trabecular<unk> s close spontaneously. Prospective studies give a prevalence of 2-5 per 100 births of trabecular<unk> s that close shortly after birth in 80-90% of the cases.
Ventricular septal defect
Heart septal defect
Atrioventricular septal defect
Atrial septal defect
Aortopulmonary septal defect
Tricuspid atresia
Double aortic arch
Double inlet left ventricle