Figure 4:

“Driving the transducer” technique in a breech fetus: A) Spine originally located at 8 o’clock in the subcostal four-chamber view. The transducer is driven on the maternal abdomen (to operator’s right, toward the fetal left side) in a fixed arc until it lies above the cardiac apex; B) on the monitor screen, the fetal spine has “converted” to a 6 o’clock position, and the apical four-chamber view is visible.