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妊娠期间,宫颈的主要功能是使胚胎保留在子宫内直到成熟。然而,有时宫颈在中期妊娠期间发生无痛性扩张,此为宫颈机能不全,导致早产或晚期流产。诊断通常是回顾性的,且在临床发现宫颈展平和/或扩张显示宫颈机能不全时才给治疗已为时太晚。本研究对170例根据既往史认为有宫颈机能不全危险的患者,从早孕至36孕周成至分娩连续超声扫查。每两周一次,并用计数测径器测量整个宫颈宽度、长度及相当宫颈内口水平的宫颈管宽度。
During pregnancy, the main function of the cervix is to keep the embryo in the womb until it matures. However, sometimes cervical painless dilatation occurs during the second trimester of pregnancy, which results in cervical incompetence, resulting in preterm or late miscarriage. The diagnosis is usually retrospective and it is too late to give treatment when clinical findings of cervical flattening and / or dilatation show cervical insufficiency. In this study, 170 consecutive patients underwent a serial ultrasound scan from early pregnancy to 36 gestational weeks until delivery, based on past history. Biweekly, and using a calipers to measure the width of the entire cervix, the length of the cervical canal and the equivalent level of the cervix.