Jl. Alcazar, INTRAOBSERVER VARIABILITY OF PULSATILITY INDEX MEASUREMENTS IN 3 FETAL VESSELS IN THE FIRST-TRIMESTER, Journal of clinical ultrasound, 25(7), 1997, pp. 366-371
Citations number
21
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging",Acoustics
Purpose. The intraobserver repeatability of pulsatility index measurem
ents in 3 fetal vessels in the early weeks of gestation was evaluated.
Methods. The pulsatility index was calculated from the flow velocity
waveforms from 3 fetal vessels in a series of 58 uneventful, low-risk,
singleton first-trimester pregnancies using transvaginal color Dopple
r sonography. The intraobserver repeatability was expressed as the int
raclass correlation coefficient. Mean menstrual age at the lime of the
examination was 10.3 weeks (range, 7.6-13). Results. Flow velocity wa
veforms from the umbilical artery, abdominal aorta, and middle cerebra
l artery were obtained in 100% (58/58), 98.3% (57/58), and 100% (34/34
) of cases, respectively. The intraclass correlation coefficients for
these vessels were 0.89, 0.79, and 0.93, respectively. Conclusions. Th
e intraobserver repeatability was acceptable for all the vessels studi
ed. (C) 1997 John Wiley & Sons, Inc.