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Related Concept Videos

Ovarian Cycle01:27

Ovarian Cycle

The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...
Fetal Circulation01:14

Fetal Circulation

Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Cleavage and Blastulation01:33

Cleavage and Blastulation

After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
Trihybrid Crosses02:27

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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Related Experiment Video

Updated: May 9, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
09:04

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

Published on: September 5, 2011

Labor patterns in twin gestations.

Heidi K Leftwich1, Mary N Zaki, Isabelle Wilkins

  • 1Division of Maternal-Fetal Medicine, University of Illinois at Chicago, Chicago, IL, USA.

American Journal of Obstetrics and Gynecology
|July 23, 2013
PubMed
Summary
This summary is machine-generated.

Twin gestations show slower active labor progression compared to singletons, affecting both first-time and experienced mothers. This finding holds true even after accounting for various influencing factors in labor progression.

Keywords:
labor curvespregnancytwins

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Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators
09:51

Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators

Published on: March 21, 2018

Related Experiment Videos

Last Updated: May 9, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
09:04

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

Published on: September 5, 2011

Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators
09:51

Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators

Published on: March 21, 2018

Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Perinatal Research

Background:

  • Twin gestations present unique challenges in labor and delivery compared to singleton pregnancies.
  • Understanding labor progression differences is crucial for optimizing clinical management and patient outcomes.

Purpose of the Study:

  • To compare the rate and pattern of labor progression between twin and singleton gestations.
  • To identify potential differences in cervical dilation rates and labor curve characteristics.

Main Methods:

  • Retrospective analysis of the Consortium on Safe Labor database (2002-2008) from 12 clinical centers.
  • Inclusion of twin gestations (cephalic presentation, ≥34 weeks) and singleton controls, with exclusion of fetal anomalies.
  • Utilized interval-censored regression and repeated-measures analysis to compare labor curves and 'traverse times' (time for cervical dilation).

Main Results:

  • Compared 891 twin gestations with 100,513 singleton controls, noting demographic differences in the twin group.
  • Median 'traverse times' for cervical dilation were significantly longer at each centimeter interval for both nulliparous and multiparous women with twins.
  • Labor curves demonstrated a delayed inflection point in twin gestations, indicating slower active phase progression.

Conclusions:

  • Women carrying twins experience a slower progression of active labor compared to those with singletons.
  • This slower labor progression in twin gestations is observed in both nulliparous and multiparous women, independent of confounding factors.