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Related Concept Videos

Menses Phase01:18

Menses Phase

The uterine cycle begins with the menstrual phase, which is considered day one of the cycle and typically lasts about five days. This phase is characterized by the degeneration and shedding of the stratum functionalis, the functional layer of the endometrium.
When fertilization does not occur, the corpus luteum deteriorates, causing a significant drop in the levels of estrogen and progesterone in the body. This hormonal decrease triggers the release of prostaglandins, which cause the uterine...
Proliferative Phase01:20

Proliferative Phase

The proliferative phase typically occurs after menstruation and lasts between 6 to 13 days in a standard 28-day cycle. This phase involves the reconstruction of the endometrium, guided by estrogen produced by the developing ovarian follicle.
Notably, the stratum basale, the basal layer of the endometrium, including the basal parts of the uterine glands, remains unaffected by menstruation. Stem cells in this layer undergo mitosis, regenerating the stratum functionalis and thickening the...
Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Secretory Phase01:19

Secretory Phase

The secretory phase of the menstrual cycle, spanning from day 14 to 28 in a typical 28-day cycle, is a period of significant physiological changes in the female reproductive system. This phase commences immediately after ovulation and is characterized by the preparation of the endometrium for potential embryo implantation.
Following ovulation, the corpus luteum, a temporary endocrine structure, produces progesterone and estrogens. These hormones stimulate the growth and coiling of endometrial...
Stages of Sleep01:22

Stages of Sleep

Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
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...

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Obstetric management for stillbirth complicated by a prior cesarean delivery: a cost-effectiveness analysis.

The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians·2020
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Predicting vaginal birth after previous cesarean: Using machine-learning models and a population-based cohort in Sweden.

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Extending the second stage of labor in nulliparous women with epidural analgesia: a cost-effectiveness analysis.

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Related Experiment Video

Updated: May 10, 2026

Electromyometrial Imaging of Uterine Contractions in Pregnant Women
08:07

Electromyometrial Imaging of Uterine Contractions in Pregnant Women

Published on: May 26, 2023

Normal first stage of preterm labor.

Janine E Spain1, Methodius Tuuli1, Aaron B Caughey2

  • 1Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri.

American Journal of Perinatology
|June 19, 2013
PubMed
Summary

Women experiencing preterm labor progress through the first stage of labor faster than those in term labor. This finding holds true for both nulliparous and multiparous women, indicating a quicker labor progression in preterm cases.

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Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Perinatology

Background:

  • Understanding labor progression is crucial for optimizing obstetric care.
  • First-stage labor duration can vary significantly based on gestational age.
  • Previous studies have not consistently compared labor patterns between preterm and term labor.

Purpose of the Study:

  • To compare the patterns of first-stage labor progression between women in preterm labor and women in labor at term.
  • To analyze labor curves and identify differences in the rate of cervical dilation.

Main Methods:

  • Retrospective cohort study of 5,612 singleton gestations (2004-2008).
  • Labor curves generated using repeated-measures analysis with polynomial modeling.
  • Interval-censored regression and multivariable analyses adjusted for parity, smoking, obesity, and induction.

Main Results:

  • Preterm labor (224 births) progressed significantly faster than term labor (5,388 births).
  • Median time from 4 to 10 cm dilation was 3.3 hours for preterm vs. 4.5 hours for term labor (p < 0.01).
  • Faster progression observed in both nulliparous and multiparous women with preterm labor.

Conclusions:

  • Women in preterm labor experience a more rapid progression through the first stage compared to women at term.
  • This accelerated labor pattern in preterm gestations is consistent across different parity groups.