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Prior cesarean and the risk for placenta previa on second-trimester ultrasonography.

Publication ,  Journal Article
Laughon, SK; Wolfe, HM; Visco, AG
Published in: Obstet Gynecol
May 2005

OBJECTIVE: To determine whether the increased risk of placenta previa at delivery in patients with a prior cesarean results from an increased risk of abnormal implantation or a lower likelihood of resolution. METHODS: A hospital-based, case-control study was performed. Cases were defined as singleton pregnancies with a placenta previa on second-trimester ultrasonography. Controls, chosen randomly from patients without a placenta previa on second-trimester ultrasonography, were matched 3:1 with cases. Odds ratios (OR) were calculated, controlling for other independent risk factors for previa: age, parity, race, and smoking. RESULTS: There were 88 cases identified and 264 controls. Twenty cases (22.7%) and 35 controls (13.3%) had a history of prior cesarean delivery. Previous cesarean delivery was an independent risk factor for previa on second-trimester ultrasonography (OR 1.92, 95% confidence interval [CI] 1.04-3.55), as was the number of cesareans (OR 1.62, 95% CI 1.12-2.34). However, neither retained their significance after adjusting for other known risk factors for previa (OR 1.50, 95% CI 0.77-2.92, and OR 1.40, 95% CI 0.93-2.10, respectively). At delivery, a history of cesarean was associated with a 3-fold increased risk of previa. CONCLUSION: A previous cesarean delivery did not increase the odds for detecting a placenta previa on second-trimester ultrasonography. At delivery, a previous cesarean was associated with a previa, suggesting a lower likelihood of resolution.

Duke Scholars

Published In

Obstet Gynecol

DOI

ISSN

0029-7844

Publication Date

May 2005

Volume

105

Issue

5 Pt 1

Start / End Page

962 / 965

Location

United States

Related Subject Headings

  • Ultrasonography, Prenatal
  • Risk Assessment
  • Reference Values
  • Prognosis
  • Probability
  • Pregnancy Trimester, Second
  • Pregnancy Outcome
  • Pregnancy
  • Placenta Previa
  • Parity
 

Citation

APA
Chicago
ICMJE
MLA
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Laughon, S. K., Wolfe, H. M., & Visco, A. G. (2005). Prior cesarean and the risk for placenta previa on second-trimester ultrasonography. Obstet Gynecol, 105(5 Pt 1), 962–965. https://doi.org/10.1097/01.AOG.0000158114.47925.fa
Laughon, S Katherine, Honor M. Wolfe, and Anthony G. Visco. “Prior cesarean and the risk for placenta previa on second-trimester ultrasonography.Obstet Gynecol 105, no. 5 Pt 1 (May 2005): 962–65. https://doi.org/10.1097/01.AOG.0000158114.47925.fa.
Laughon SK, Wolfe HM, Visco AG. Prior cesarean and the risk for placenta previa on second-trimester ultrasonography. Obstet Gynecol. 2005 May;105(5 Pt 1):962–5.
Laughon, S. Katherine, et al. “Prior cesarean and the risk for placenta previa on second-trimester ultrasonography.Obstet Gynecol, vol. 105, no. 5 Pt 1, May 2005, pp. 962–65. Pubmed, doi:10.1097/01.AOG.0000158114.47925.fa.
Laughon SK, Wolfe HM, Visco AG. Prior cesarean and the risk for placenta previa on second-trimester ultrasonography. Obstet Gynecol. 2005 May;105(5 Pt 1):962–965.
Journal cover image

Published In

Obstet Gynecol

DOI

ISSN

0029-7844

Publication Date

May 2005

Volume

105

Issue

5 Pt 1

Start / End Page

962 / 965

Location

United States

Related Subject Headings

  • Ultrasonography, Prenatal
  • Risk Assessment
  • Reference Values
  • Prognosis
  • Probability
  • Pregnancy Trimester, Second
  • Pregnancy Outcome
  • Pregnancy
  • Placenta Previa
  • Parity