Table 1

Study inclusion criteria

Fetal anomaly scan abnormalityAntenatal risk factor
Suspected CHD on fetal anomaly scanCHD in first-degree relative of fetus (requiring surgical or
catheter intervention during first year of life)
Fetal dysrhythmiaMaternal IDDM
Hydrops fetalisExposure to teratogens associated with CHD (maternal or paternal)
Extra-cardiac fetal anomaly associated with CHD on fetal anomaly scan
  • CHD, congenital heart disease; IDDM, insulin-dependent diabetes mellitus.