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Am J Perinatol 2019; 36(01): 086-089
DOI: 10.1055/s-0038-1667031
SMFM Fellowship Series Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Interdelivery Interval and Medically Indicated Preterm Delivery

Annie M. Dude
1   Division of Maternal–Fetal Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
,
William A. Grobman
1   Division of Maternal–Fetal Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
› Author Affiliations Funding Research reported in this publication was supported, in part, by the National Institutes of Health's National Center for Advancing Translational Sciences, Grant Number UL1TR001422. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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Publication History

13 September 2017

03 June 2018

Publication Date:
17 July 2018 (online)

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Abstract

Objective The objective of this study was to examine whether a medically indicated preterm delivery is relatively more likely following longer interdelivery intervals.

Study Design This is a case–control study of women with two consecutive deliveries of a live singleton at the same institution between 2005 and 2015, with the subsequent delivery occurring preterm. Preterm deliveries were classified as spontaneous if women delivered following preterm labor, preterm premature rupture of membranes, or placental abruption. Preterm deliveries were classified as medically indicated if women underwent delivery for fetal or maternal medical indications. Interdelivery interval was categorized as < 18, 18 to 59, and 60 months or more. Characteristics of women who had a medically indicated versus spontaneous preterm delivery were compared.

Results Of the 1,276 women, 25.6% had a medically indicated preterm delivery and 74.4% had a spontaneous preterm delivery. Compared with women with an interdelivery interval of 18 to 59 months (of whom 25.7% had a preterm delivery for medical indications), women with a shorter interdelivery interval were less likely (19.3%), while women with a longer interdelivery interval were more likely (37.4%; p = 0.003) to have a medically indicated preterm delivery. This relationship persisted even when accounting for other factors.

Conclusion Preterm deliveries are more likely to be medically indicated as the interdelivery interval lengthens.

Keywords

interdelivery interval - preterm birth - preterm labor

Note

A version of this article was presented at the 64th Society for Reproductive Investigation Annual Scientific Meeting, Orlando, FL, March 15–18, 2017.


 

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