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First- vs second-trimester ultrasound: the effect on pregnancy dating and perinatal outcomes.

Abstract：

OBJECTIVE:The objective of the study was to examine the effect of first-trimester obstetric ultrasound (OBUS) on the measurement of the effect of complications ascribed to postterm pregnancies. STUDY DESIGN:We conducted a retrospective cohort study of all term, singleton pregnancies delivered at our institution who had an OBUS at a gestation of 24 weeks or less. Those women who underwent an OBUS at a gestation of 12 weeks or less (OBUS12) were compared with those who had an OBUS at 13-24 weeks of gestation (OBUS13-24). The primary outcome measures were the rates of postterm pregnancies greater than 41 or 42 weeks' gestation. Secondary outcomes were the differences between the postterm and term gestations in maternal and neonatal outcomes. RESULTS:In the OBUS12 group, the rate of postterm pregnancy 42 weeks or longer was lower (2.7%) as compared with the OBUS13-24 group (3.7%, P = .022). With regard to reaching 41 weeks of gestation, the OBUS12 group was again lower (18.2%) as compared with the OBUS13-24 group (22.1%, P < .001). There were also fewer postterm inductions at 42 weeks or longer in the OBUS12 group (1.8%) as compared with the OBUS13-24 group (2.6%, P = .017). When comparing perinatal outcomes between those women who reached 41 weeks of gestation and those prior to 41 weeks of gestation, the OBUS12 group demonstrated greater differences between these 2 groups. CONCLUSION:Our findings suggest that earlier obstetric ultrasound, which leads to better pregnancy dating, reduces the rate of estimated postterm pregnancies. This may, in turn, reduce unnecessary intervention and lead to better identification of postterm pregnancies at greater risk of complications.

journal_name

Am J Obstet Gynecol

journal_title

American journal of obstetrics and gynecology

authors

Caughey AB,Nicholson JM,Washington AE

doi

10.1016/j.ajog.2008.03.034

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

703.e1-5; discussion 703.e5-6

issue

6

eissn

0002-9378

issn

1097-6868

pii

S0002-9378(08)00298-6

journal_volume

198

pub_type

杂志文章

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