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Hum. Reprod. Advance Access published online on August 19, 2004
Human Reproduction, doi:10.1093/humrep/deh384
© 2004 by European Society of Human Reproduction and Embryology
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Received March 15, 2004
Accepted June 2, 2004

Article

Comparison of endometrial and subendometrial blood flow measured by three-dimensional power Doppler ultrasound between stimulated and natural cycles in the same patients

Ernest Hung Yu Ng 1*, Carina Chi Wai Chan 1, Oi Shan Tang 1, William Shu Biu Yeung 1, Pak Chung Ho 1

1 Department of Obstetrics and Gynaecology, The University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China

* To whom correspondence should be addressed. E-mail: nghye{at}hkucc.hku.hk.


  Abstract

BACKGROUND: Low implantation rates in stimulated IVF cycles may be related to suboptimal endometrial perfusion. Endometrial and subendometrial blood flow was compared between stimulated and natural cycles in the same patients undergoing IVF. METHODS: Three-dimensional (3D) ultrasound examination with power Doppler was performed in stimulated and natural cycles of 67 consecutive patients to measure endometrial thickness, uterine artery pulsatility index/resistance index, endometrial volume, vascularization index (VI)/flow index (FI)/vascularization flow index (VFI) of endometrial and subendometrial regions. RESULTS: Endometrial and subendometrial blood flow was absent in four (6.0%) patients in the stimulated cycle and two (3.0%) patients in the natural cycle. Endometrial and subendometrial VI/FI/VFI were significantly lower in stimulated cycles than those in natural cycles. The median (95% CI) decreases in endometrial VI/FI/VFI were 35.8% (-2.5, 216.8), 5.0% (0.1, 12.3) and 48.4% (2.5, 315.3) respectively whereas the corresponding decreases in the subendometrial region were 66.6% (-0.2, 220.5), 4.3% (0.8, 16.2) and 76.3% (41.0, 303.4) respectively. CONCLUSION: Endometrial and subendometrial blood flow was significantly lower in the stimulated cycle than that in the natural cycle.

Keywords: endometrial and subendometrial blood flow; natural cycles; stimulation; three-dimensional power Doppler.
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