Investigation of uterine peristalsis diurnal variation

Aki Kido, Kaori Togashi, Asako Nakai, Masako Kataoka, Toshitaka Fujiwara, Milliam L. Kataoka, Ryota Fujimoto, Takashi Koyama, Shingo Fujii
In: Magnetic Resonance Imaging · 2006 · vol. 24(9) , pp. 1149–1155 · doi:10.1016/j.mri.2006.06.002 · W2045360908
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This paper investigated the diurnal variation of uterine peristalsis in rats, revealing significant fluctuations throughout the day and night.

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Abstract

BackgroundIn women of reproductive age, wavelike movements of the subendometrial myometrium, which is called uterine peristalsis, is considered to be related with fertility and menstrual problems. This is because the direction and frequency of peristalsis is known to be different among menstrual cycle phases. However, nothing is known as regarding diurnal variations. This study was designed to evaluate for the presence of a diurnal variation in uterine peristalsis.Materials and methodsMR studies were performed on 12 volunteers of reproductive age using a 1.5-T magnet, four times per day (at 0800, 1300, 1800 and 2300 h) during three (periovulatory, luteal and menstrual) phases of one menstrual cycle. Sixty images were obtained by half-Fourier acquisition single-shot turbo spin echo every 2 s and displayed on cine mode. Semiautomated software was utilized to discern the presence of peristaltic waves, as well as peristaltic frequency and direction. The presence of sustained contractions was visually determined.ResultsThere was no statistically significant difference during the daytime for frequency and direction of uterine peristalsis for all menstrual cycle phases. Nonetheless, peristaltic frequency and direction fluctuated during each cycle. Statistically significant peristaltic suppression was observed in association with sustained contractions during the periovulatory phase.ConclusionsA diurnal variation was not observed for uterine peristalsis. Sporadic changes in peristaltic frequency were observed and appear to be closely related to sustained uterine contractions.

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