title: Alteration of thyroid blood flow during the normal menstrual cycle in healthy Chinese women.
abstract: The purpose of this study was to investigate the relationship between thyroid activity and the menstrual cycle by measuring the Doppler parameters of the superior thyroid arteries in women of reproductive age. The study was performed in 27 healthy Chinese women aged between 19 and 28 y for one menstrual cycle, and 25 age-matched healthy Chinese men for 3 weeks for comparison. In women, the peak systolic velocity increased from the follicular phase to the luteal phase, and the pulsatility index decreased from the follicular phase to the ovulatory phase and increased slightly in the luteal phase. In men, alterations in the pattern of thyroid blood flow were not observed; however, the average values of Doppler parameters during the study period in women were similar to those in men. The gender difference in the pattern of flow characteristics in the superior thyroid artery suggests effects of estrogen on thyroid function.
authors.affiliation: Department of Optometry and Radiography, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong.
authors.forename: S T
authors.initials: ST
authors.lastname: Chan
authors.forename: F
authors.initials: F
authors.lastname: Brook
authors.forename: A
authors.initials: A
authors.lastname: Ahuja
authors.forename: B
authors.initials: B
authors.lastname: Brown
authors.forename: C
authors.initials: C
authors.lastname: Metreweli
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001783:Blood Flow Velocity / Q000502:physiology*; D005260:Female; D006723:Hong Kong; D006801:Humans; D008297:Male; D008597:Menstrual Cycle / Q000502:physiology*; D011673:Pulsatile Flow; D012016:Reference Values; D012737:Sex Factors; D013961:Thyroid Gland / Q000098:blood supply* / Q000000981:diagnostic imaging*; D018615:Ultrasonography, Doppler, Color