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Recurrent preterm birth.

Shali Mazaki-Tovi1, Roberto Romero, Juan Pedro Kusanovic

  • 1Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, USA.

Seminars in Perinatology
|May 29, 2007
PubMed
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Recurrent preterm birth, defined as two or more early deliveries, has varying recurrence rates. Factors like spontaneous versus indicated birth and maternal race influence these risks.

Area of Science:

  • Obstetrics and Gynecology
  • Reproductive Medicine
  • Perinatal Research

Background:

  • Recurrent preterm birth (two or more deliveries before 37 weeks) poses significant risks.
  • Preterm birth subtypes include spontaneous (preterm labor or rupture of membranes) and indicated.
  • Understanding recurrence patterns is crucial for improving perinatal outcomes.

Purpose of the Study:

  • To review the literature on the recurrence risk of spontaneous and indicated preterm birth.
  • To identify factors modifying the risk of recurrent spontaneous preterm birth.
  • To examine ethnic variations in recurrent preterm birth rates.

Main Methods:

  • Systematic literature review of studies on preterm birth recurrence.
  • Analysis of risk factors associated with spontaneous preterm birth recurrence.

Related Experiment Videos

  • Examination of data on indicated preterm birth recurrence and associated risks.
  • Inclusion of studies reporting on demographic factors, such as maternal race.

    • Main Results:

    • Recurrence rates differ significantly based on whether the antecedent preterm birth was spontaneous or indicated.
    • Short sonographic cervical length and positive cervicovaginal fetal fibronectin are associated with recurrent spontaneous preterm birth.
    • Individuals of Black origin exhibit higher rates of recurrent preterm birth.
    • History of indicated preterm birth increases risk for both indicated and spontaneous recurrence.

    Conclusions:

    • The risk and patterns of recurrent preterm birth are complex and subtype-dependent.
    • Specific clinical markers (cervical length, fetal fibronectin) can identify high-risk pregnancies for spontaneous preterm birth recurrence.
    • Ethnic disparities exist, with Black individuals facing elevated risks for recurrent preterm birth, warranting further investigation and targeted interventions.