Uterine artery impedance at very early clinical pregnancy

• DOI: 10.1002/pd.4325
• Publication Date: 2014-01-16T06:30:36Z
• Authors: Luís Guedes-Martins; Joaquim Saraiva; Rita Gaio; Filipe Macedo; Henrique Almeida
• Keywords: Notching; Pulsatility index

The aim of the study was to construct gestational age-based reference ranges for uterine artery (UtA) mean pulsatility (PI) and resistance (RI) indices from 6 10 weeks pregnancy.A prospective, cross-sectional, observational carried out in 312 singleton pregnancies with age ranging weeks. UtAs were examined transvaginally by color pulsed Doppler imaging, right left values PI RI, as well presence or absence a bilateral protodiastolic notch, recorded. UtA-PI UtA-RI percentiles derived through time-conditional quantile regression.The authors 10th, 50th, 90th percentile curves correspondent 95% confidence intervals, evolution UtA RI week gestation. prevalence notching 8.1% (6/74) at 28.8% (15/52) weeks.The present evidence progressive reduction vascular impedance very early stage pregnancy provide new, averaged charts between