Preovulatory changes of blood flow in different regions of the human follicle

Fertility and Sterility
M BrännströmT Bourne

Abstract

To assess regional changes in ultrasound-derived indices of blood flow in the dominant human follicle after the plasma LH surge. A cross-sectional, prospective study. Reproductive medicine unit at a university. Women attending an assisted conception clinic to determine the appropriate time to transfer previously frozen embryos during a natural cycle. Transvaginal ultrasonography with color Doppler imaging and pulsed Doppler spectral analysis was used to obtain indices of blood flow and velocity from vessels in the base, lateral part, and apex of the dominant follicle on days 10-12 (from day 1 of menses) and after the LH surge, but before rupture. Immunoassays were used to measure the blood concentrations of LH twice daily (at 8-10 A.M. and 4-6 P.M.) from cycle day 10. The pulsatility index (PI), resistance index (RI), peak systolic velocity (PSV), and time-averaged maximum velocity (TAMXV) in the uterine arteries and three regions of the dominant follicle (apical, lateral, and basal parts); follicular volume; the day and time of the onset of the LH surge (defined as first concentration of LH > 22 U/L) and the times of each scan. Twenty-two women (aged 28-39 years) were studied and seven were scanned on days 10-12. A retrospecti...Continue Reading

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