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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...
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...
Development of Blood Vessels01:07

Development of Blood Vessels

The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
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...
The Menstrual Cycle01:19

The Menstrual Cycle

The menstrual cycle is a recurrent sequence of changes in the uterine endometrium, specifically its functional layer, the stratum functionalis. This cycle prepares the uterus for potential pregnancy. This cycle typically spans 21–35 days, averaging 28 days, and aligns with the ovarian cycle, regulated by fluctuating levels of ovarian hormones, primarily estrogen and progesterone.
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a uterine...

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Related Experiment Video

Updated: Jun 22, 2026

Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes
04:08

Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes

Published on: June 27, 2025

First trimester bleeding.

Mark Deutchman1, Amy Tanner Tubay, David Turok

  • 1Department of Family Medicine, University of Colorado Denver School of Medicine, Aurora, CO 80045, USA. mark.deutchman@ucdenver.edu

American Family Physician
|June 12, 2009
PubMed
Summary
This summary is machine-generated.

First-trimester vaginal bleeding is common, with about half of cases resulting in miscarriage. Early detection using ultrasound and human chorionic gonadotropin (hCG) levels helps diagnose causes like ectopic pregnancy and guides treatment.

Related Experiment Videos

Last Updated: Jun 22, 2026

Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes
04:08

Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes

Published on: June 27, 2025

Area of Science:

  • Obstetrics and Gynecology
  • Reproductive Medicine
  • Early Pregnancy Complications

Background:

  • Vaginal bleeding affects approximately 25% of first-trimester pregnancies, with a 50% miscarriage rate.
  • Distinguishing causes of bleeding is crucial for appropriate management and patient outcomes.

Purpose of the Study:

  • To outline diagnostic criteria for first-trimester vaginal bleeding.
  • To differentiate between various causes of early pregnancy bleeding.
  • To guide management strategies based on diagnostic findings.

Main Methods:

  • Utilizing transvaginal ultrasonography to assess gestational sac, yolk sac, and embryonic cardiac activity.
  • Monitoring beta subunit of human chorionic gonadotropin (hCG) levels for normal pregnancy progression.
  • Clinical examination for adnexal masses or free pelvic fluid.

Main Results:

  • Normal pregnancy criteria include a gestational sac >10mm with a yolk sac, or a live embryo >5mm with cardiac activity.
  • Normal hCG levels should increase by 80% every 48 hours.
  • Absence of normal findings suggests early pregnancy failure, while adnexal masses or free fluid indicate potential ectopic pregnancy.

Conclusions:

  • Early pregnancy failure diagnosis relies on discriminatory ultrasound and hCG criteria.
  • Management varies: expectant for incomplete abortion, misoprostol for intrauterine failure, methotrexate for ectopic pregnancy, and surgical evacuation for gestational trophoblastic disease.
  • Post-loss care should address future pregnancy planning, contraception, and psychological support.