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Daily variability of umbilical and lateral uterine wall artery blood velocity waveform measurements
Author(s) -
HASTIE STEWART J.,
HOWIE CATHERINE A.,
WHITTLE MARTIN J.,
RUBIN PETER C.
Publication year - 1988
Publication title -
bjog: an international journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.157
H-Index - 164
eISSN - 1471-0528
pISSN - 1470-0328
DOI - 10.1111/j.1471-0528.1988.tb09485.x
Subject(s) - umbilical artery , waveform , cardiology , medicine , uterine artery , physics , biology , pregnancy , fetus , gestation , genetics , quantum mechanics , voltage
Summary. The daily variability of umbilical artery and lateral uterine wall artery velocity‐time waveforms recorded by continuous wave Doppler ultrasound was determined by making three observations in each of 97 women on different days within a 7‐day period. There were no significant changes in the maximal:minimal Doppler shift frequency (A/B ratio) or the pulsatility index in either artery over the period of study. Common pregnancy complications did not influence the variability of the recordings. The variability of uterine artery recordings was not affected by gestational age between 17 and 41 weeks but the degree of variability of the umbilical artery recordings was greater before 30 weeks. We conclude that after 30 weeks gestation this technique has an acceptable range of daily variability for clinical and research applications.