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Related Concept Videos

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.
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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...
Disorders of Erythrocytes01:27

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.

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Updated: Jun 15, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

Published on: December 27, 2017

Adolescent menorrhagia due to platelet function disorder.

Nazli Hossain1, Tasneem Farzana, Nusrat Hasan Khan

  • 1Department of Obstetrics & Gynecology Unit-3, Dow University of Health Sciences & Civil Hospital Karachi.

JPMA. the Journal of the Pakistan Medical Association
|March 10, 2010
PubMed
Summary

Menorrhagia affects 14-48% of adolescents with bleeding disorders. This study highlights platelet function disorders as a key cause, differing from Western findings that often cite von Willebrand disease.

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Microfluidics in Assessing Platelet Function
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Last Updated: Jun 15, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
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Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

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Published on: November 8, 2024

Area of Science:

  • Hematology
  • Adolescent Medicine
  • Gynecology

Background:

  • Menorrhagia is common in adolescents with bleeding disorders, with prevalence ranging from 14% to 48%.
  • Common causes include von Willebrand disease (VWD), platelet function disorders, and coagulation factor deficiencies.

Observation:

  • Geographic variations exist, with Western studies identifying VWD as the primary cause, while South-East Asian studies point to platelet function disorders.
  • Anovulatory bleeding and hormonal imbalances are also significant contributors to heavy menstrual bleeding in this demographic.

Findings:

  • This report details three cases of adolescent menorrhagia specifically caused by platelet function disorders.
  • A literature review complements these case studies, providing broader context on the condition.

Implications:

  • Recognizing platelet function disorders as a significant cause of adolescent menorrhagia is crucial for accurate diagnosis and management.
  • Understanding regional differences in bleeding disorder prevalence can improve targeted screening and treatment strategies for heavy menstrual bleeding.