Why the study?
How does the isthmic systolic index (ISI) profile the changing influence of right and left ventricular performance on Doppler flow velocity waveforms of the aortic isthmus throughout normal pregnancy?
How does the isthmic systolic index (ISI) profile the changing influence of right and left ventricular performance on Doppler flow velocity waveforms of the aortic isthmus throughout normal pregnancy?
The isthmic systolic index (ISI) effectively profiles the transitional changes of right and left ventricular outputs throughout normal pregnancy, highlighting the physiological increase in fetal right ventricle flow preponderance.
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ISI profiles normal fetal RV dominance shift; hypothesis-generating for isthmic Doppler before clinical or pathologic validation.
Chabaneix et al. (2014) studied this question.
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