Fig. 5
From: Identification of fetal cardiac anatomy and hemodynamics: a novel enhanced screening protocol
Sonographic images of a 22-gestational-week fetus diagnosed with ccTGA. The 4CV (a) showed four symmetric chambers that were considered to be normal by sonographers under Protocol A. However, it was confirmed as atrioventricular discordance by carefully visualizing the position of the atrioventricular valves that insert into the septum. In addition, the left (b) and right (c) outflow tract views substantiate that MPA was connected to morphological LV, while AAO connected to morphological RV. Sequential segmental analysis allowed sonographers under Protocol B to detect this anomaly. 4CV, four-chamber view; AAO, ascending aorta; ccTGA, congenitally corrected transposition of the great arteries; DAO, descending aorta; LA, left atrium; LPA, left pulmonary artery; LV, left ventricle; MPA, main pulmonary artery; RA, right atrium; RPA, right pulmonary artery; RV, right ventricle; S, spine