Chatper 21: Ventricular outflow tract anomalies: so-called conotruncal anomalies

This discrepancy can be explained by a low detection rate of conotruncal anomalies at the time of fetal cardiac screening, if the four-chamber view is used alone. 7 Recently there has been significant improvement in the detection rates of conotruncal anomalies owing to inclusion of outflow tract examination in the screening protocol ( Table 21.1 ). 8,9 As conotruncal anomalies often require assessment and treatment immediately after birth, prenatal detection is critically important.