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Human Reproduction, Vol. 14, No. 11, 2716-2719, November 1999
© 1999 European Society of Human Reproduction and Embryology

Diurnal variation in uterine artery blood flow in post-menopausal women on oestrogen hormone replacement therapy

D. Jurkovic1, D. Ross, N. Aslam and M. Whitehead

Department of Obstetrics and Gynaecology, King's College Hospital, Denmark Hill, London SE5 8RX, UK

Doppler ultrasound was used to investigate circadian variations in uterine artery blood flow in 20 post-menopausal women in the oestrogen-only phase of combined oestrogen hormone replacement therapy with cyclical oral norethisterone or dydrogesterone. All women were examined between 0800 and 0830 h and then again between 1800 and 1830 h on the same day. Mean arterial blood pressure, heart rate and a blood sample for measurement of serum oestradiol were taken at each visit. Indices of uterine artery blood flow included the pulsatility index, resistance index, peak systolic velocity and time-averaged maximum velocity. No significant differences in the mean arterial blood pressure, pulse rate and oestradiol concentrations were detected between morning and evening visits. Significant fluctuation was observed in the pulsatility index (P < 0.001), resistance index (P < 0.001) and time-averaged maximum velocity (P < 0.01). The assessment of uterine artery blood flow in post-menopausal women should take into account the presence of circadian variations to ensure accuracy and reproducibility of Doppler investigations.

Key words: blood flow/circadian rhythm/Doppler ultrasound/uterine artery

1 To whom correspondence should be addressed


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C. C.W. Chan, E. H.Y. Ng, O.-S. Tang, and P.-C. Ho
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[Abstract] [PDF]


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