Background and objectives: Infertility is inability to conceive after one year of regular unprotected intercourse. Unexplained infertility is present if the basic fertility investigations are normal. The objective of this study is to investigate the use of uterine artery blood flow as a cause of unexplained infertility (using pulsatility index, resistance index) and compare them to fertile women. Methods: A prospective cohort study was performed on 70 patients (35 fertile and 35 with unexplained infertility patients) in Sulaymaniyah Maternity Teaching Hospital, Kurdistan Region, Iraq, during October 2016 to December 2017. Transvaginal color Doppler ultrasound was done in the mid luteal phase (day 21 - 24) for uterine artery by using pulsatility index and resistance index. Results: The age of the patients ranged from 20 - 39 years. The uterine artery pulsatility index was significantly higher in the unexplained infertile women (mean ± SD = 2.78 ± 0.615) than fertile women (mean ± SD = 2.42 ± 0.325). The uterine artery blood flow resistance index was significantly higher in unexplained infertile group (mean ± SD = 0.899 ± 0.066) than fertile women (mean ± SD = 0.83 ± 0.054). Conclusions: Unexplained infertility is associated with decreased uterine artery blood flow and increase uterine artery resistance (pulsatility index and resistance index) when compared with fertile women.
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