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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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...
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Structure and Function of Platelets01:18

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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.
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Clot Retraction and Fibrinolysis01:16

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Introduction to Hemostasis01:05

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
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Fetal Circulation01:14

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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.
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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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Updated: Aug 6, 2025

Hemodynamic Precision in the Neonatal Intensive Care Unit using Targeted Neonatal Echocardiography
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Platelets and ductus arteriosus closure in neonates.

Hannes Sallmon1, Cassidy A Delaney2

  • 1Department of Congenital Heart Disease/Pediatric Cardiology, Deutsches Herzzentrum der Charité (DHZC), Berlin, Germany; Division of Pediatric Cardiology, Graz Medical University, Graz, Austria.

Seminars in Perinatology
|March 16, 2023
PubMed
Summary

Platelets play a key role in closing the ductus arteriosus in newborns. However, low platelet counts or dysfunction in preterm infants may hinder this process, impacting treatment effectiveness and safety.

Keywords:
IbuprofenIndomethacinPatent ductus arteriosusPlateletsPreterm infantThrombocytopeniaVery low birth weight

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Area of Science:

  • Neonatal physiology
  • Hematology
  • Cardiovascular development

Background:

  • Platelet plug formation is crucial for ductus arteriosus closure in neonates.
  • Thrombocytopenia and platelet dysfunction in preterm infants may impair ductal closure.
  • Neonatal platelets have complex roles, including signaling and cell interactions, in ductal closure.

Purpose of the Study:

  • To review the mechanistic evidence for platelets in ductus arteriosus closure.
  • To discuss the clinical implications of platelet function in preterm infants with patent ductus arteriosus.
  • To suggest future research directions for platelet-endothelial interactions.

Main Methods:

  • Review of existing literature on platelet function and ductus arteriosus closure.
  • Analysis of mechanistic evidence from preclinical and clinical studies.
  • Discussion of a randomized-controlled trial on platelet transfusions in preterm infants.

Main Results:

  • Platelets are involved in ductal closure mechanisms.
  • Platelet issues can negatively affect spontaneous and induced ductal closure.
  • A liberal platelet transfusion strategy did not improve ductal closure and increased intraventricular hemorrhage risk.

Conclusions:

  • Platelets have significant, multifaceted roles in neonatal ductus arteriosus closure.
  • Understanding platelet-endothelial interactions is vital for managing patent ductus arteriosus in preterm infants.
  • Further research is needed to optimize therapeutic strategies involving platelets.