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Int J Gynaecol Obstet ; 131(1): 45-8, 2015 Oct.
Article in English | MEDLINE | ID: mdl-26187540

ABSTRACT

OBJECTIVE: To establish longitudinal reference intervals for pulsatility index (PI) and systolic velocity (SV) of the fetal renal artery, and to evaluate their correlation with the amniotic fluid index (AFI). METHODS: A prospective longitudinal study was conducted among women with low-risk pregnancies who attended outpatient clinics at the University of Campinas Medical School, Brazil, at 16-19 weeks of pregnancy between April 1, 2008, and March 31, 2010. Doppler velocimetric measurements of the fetal renal artery and assessments of the AFI were undertaken at 4-week intervals to 36 weeks, and every 2 weeks thereafter until delivery. RESULTS: A total of 63 women were enrolled. The PI of the fetal renal artery showed little variation during pregnancy, whereas SV values increased to 36-37 weeks of pregnancy and decreased thereafter. No correlations were found between the AFI and the fetal renal artery Doppler velocimetric parameters (P>0.05 for all). The intraclass correlation coefficients for intra-observer and inter-observer variability indicated good reproducibility of SV, but the reproducibility of PI was lower. CONCLUSIONS: The AFI did not correlate with fetal renal artery Doppler velocimetric measures among low-risk pregnancies. However, investigations are needed among high-risk pregnancies.


Subject(s)
Amniotic Fluid/diagnostic imaging , Renal Artery/diagnostic imaging , Ultrasonography, Doppler/methods , Ultrasonography, Prenatal/methods , Adult , Blood Flow Velocity/physiology , Brazil , Female , Humans , Longitudinal Studies , Observer Variation , Pregnancy , Prospective Studies , Reference Values , Reproducibility of Results , Young Adult
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