Fig. 3.

Ultrasonographic measurements of jet length in normal pregnancies (solid line, dashed lines represent 95% confidence intervals, from Ref. [11] compared with jet length predicted by the model with ultrasound measured flow velocities at the SA mouth (crosses represent predictions at nominal parameters for each gestation, error bars represent jet length predicted at minimum and maximum of 95% confidence range for velocity at SA mouth). The model underpredicts jet length at all but the earliest gestation. Note that the predicted jet length at 35 weeks is small, but nonzero, and the level of jet length is defined as flow velocity less than 1 × 10⁻¹ m s⁻¹ for consistency with ultrasound, so there is still circulation predicted in the IVS under these conditions.