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Normal Cervical Effacement in Term Labor.

Abstract：

OBJECTIVE:To estimate the natural history of cervical effacement in labor. STUDY DESIGN:This is a retrospective cohort study of term, vertex, singletons who reached 10 cm of cervical dilation from 2010 to 2014. Interval-censored regression was used to estimate the median number of hours between changes in effacement (measured in centimeters of the residual cervix) and to estimate the median effacement at a given cervical dilation. Analysis was stratified by parity and labor type. RESULTS:In total, 7,319 patients were included. Multiparas had faster effacement from 1 cm to complete effacement than nulliparas, but nulliparas were significantly more effaced at each cervical dilation. Patients in spontaneous labor had faster effacement and were significantly more effaced at each centimeter of cervical dilation than those who were induced or augmented. Once active labor was established (>6 cm of cervical dilation), 95% of patients had an effacement of 1 cm or less. By 8 cm of cervical dilation, 50% of all patients were completely effaced. CONCLUSION:There is a wide range in the normal length of time for the progression of cervical effacement. However, once a patient is in active labor, 95% of patients have effaced to 1 cm or less.

journal_name

Am J Perinatol

journal_title

American journal of perinatology

authors

Rhoades JS,Stout MJ,Woolfolk C,Tuuli MG,Macones GA,Cahill AG

doi

10.1055/s-0038-1645858

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

34-38

issue

1

eissn

0735-1631

issn

1098-8785

journal_volume

36

pub_type

杂志文章

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