Supine: Indicates fetal cardiac orientation is between 10-2 o’clock
Lateral: Indicates fetal cardiac orientation is between 2-4 and 8-10
o’clock
Prone: Indicates fetal cardiac orientation is between 4-8 o’clock
AzV, azygos vein; BITA: bilateral internal thoracic artery; BSA,
bilateral subclavian artery; LIV, left innominate vein.