title: The choice of index for umbilical artery Doppler waveforms.
abstract: Umbilical artery Doppler waveforms acquired from 211 patients were used to investigate the power of different waveform indices in predicting antenatal fetal compromise. Waveform indices were calculated using a BBC microcomputer. The specificity at 100% sensitivity for detection of antenatal fetal compromise was not significantly different for resistance index, pulsatility index, normalised resistance index and normalised pulsatility index, and was approximately 80%. For the indices of resistance time and downslope the specificity was significantly lower. This similarity in the power of a number of indices in the detection of antenatal fetal compromise suggests that standardisation to one of the simpler indices such as resistance index or pulsatility index could be adopted.
authors.affiliation: Department of Medical Physics, Royal Infirmary, Edinburgh.
authors.forename: P R
authors.initials: PR
authors.lastname: Hoskins
authors.forename: N G
authors.initials: NG
authors.lastname: Haddad
authors.forename: F D
authors.initials: FD
authors.lastname: Johnstone
authors.forename: S E
authors.initials: SE
authors.lastname: Chambers
authors.forename: W N
authors.initials: WN
authors.lastname: McDicken
mesh_terms: D005260:Female; D005316:Fetal Distress / Q000175:diagnosis*; D006801:Humans; D011247:Pregnancy; D011673:Pulsatile Flow; D011674:Pulse; D012680:Sensitivity and Specificity; D014463:Ultrasonography / Q000379:methods*; D014469:Umbilical Arteries / Q000502:physiology*; D014655:Vascular Resistance