Table 3

Definitions of congenital heart defects (CHDs) from Ewer et al 7

Non-significantPresence of any one of the following at birth no longer detected at 6 months: small PDA; small PFO/ASD; muscular VSD; mildly abnormal turbulence at branch pulmonary artery.
SignificantAbove defects persisting for longer than 6 months of age. Also any cardiac lesion that requires regular monitoring beyond 6 months or requiring drug treatment but not categorised as serious or critical.
SeriousAny defect not defined as critical that requires intervention or results in death between 1 month and 1 year of age.
CriticalAll infants with hypoplastic left heart, pulmonary atresia with intact ventricular septum, simple transposition of the great arteries or interruption of the aortic arch.
All infants dying or requiring surgery within the first 28 days of life with the following conditions: coarctation of the aorta; aortic valve stenosis; pulmonary valve stenosis; tetralogy of Fallot; pulmonary atresia with ventricular septal defect; and total anomalous pulmonary venous connection.
Non-significant and significant CHD are classified as minor and serious and critical as major CHD
  • ASD, atrial septal defect; PDA, patent ductus arteriosus; PFO, patent foramen ovale; VSD, ventricular septal defect.