Why the study?
What are the normal ranges of arcuate artery resistance index values during normal pregnancy?
What are the normal ranges of arcuate artery resistance index values during normal pregnancy?
This study establishes normal ranges for arcuate artery resistance index during pregnancy, providing a baseline for evaluating uteroplacental hemodynamics.
Establishes site-specific RI norms in pregnancy; extends cross-sectional data but leaves open prospective validation before clinical adoption.
Using color and pulsed Doppler ultrasonography, arcuate arterial velocimetry was carried out in 91 normal women, at 16-40 weeks, menstrual age. The arcuate arterial hemodynamics was assessed by the calculation of the resistance index (RI). A curvilinear relationship was found between the RI value of the arcuate artery obtained from the placental site in the uterus and menstrual age (R2 = 0.328). The relationships between the RI value of the arcuate artery obtained from the nonplacental site (R2 = 0.268) or the averaged RI value between the placental and nonplacental sites (R2 = 0.321) and menstrual age were both linear. Normal ranges of RI values of arcuate arteries during pregnancy for the placental site, nonplacental site, and their average values were generated. These results provide a foundation for evaluating uteroplacental velocimetry in normal pregnancy using Doppler ultrasonography.
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Hata et al. (1993) studied this question.
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