Pulsatility index of uterine artery in pregnant and non-pregnant women

In 60 infertile women, 73 uterine arterial pulsatility indices(PI) were measured by transvaginal colour Doppler sonography.The aims were to assess uterine perfusion response in infertilewomen during spontaneous ovarian cycles, and to analyse thechange of uterine perfusion in pregnant cases. The mean PI values(± SD) of 67 non-pregnant cycles were 2.30 (±0.78) in the follicular phase, 2.51 (± 1.05) in the ovulatoryphase and 2.50 (± 0.97) in the mid-luteal phase. Themean PI values (± SD) of six pregnant cycles were 1.67(± 0.22), 1.89 (± 0.41) and 2.23 (± 0.69)in the corresponding phases respectively. The difference betweenthe PI values in the follicular phase for the pregnant and non-pregnantgroups was significant (P < 0.05), as well as that betweenthe follicular and mid-luteal phase for the pregnant group (P< 0.05). There was no significant difference between thePI values in the ovulatory or mid-luteal phase of the two groups.