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Anticoagulant Drugs: Low-Molecular-Weight Heparins

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...

Formation of the Platelet Plug

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...

Disorders of Hemostasis

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.

Venous Thrombosis III: Interprofessional Care

Venous Thrombosis III: Interprofessional Care

Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...

Structure and Function of Platelets

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...

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...

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Related Experiment Video

Updated: Jul 16, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Heparin-induced thrombosis with a normal platelet count.

George F Alvarez¹, David Bihari, David Collins

¹Department of Critical Care, Rockyview General Hospital, Calgary, Alberta, Canada. george.alvarez@calgaryhealthregion.ca

Critical Care and Resuscitation : Journal of the Australasian Academy of Critical Care Medicine

|March 14, 2007

Summary

Heparin-induced thrombocytopenia (HIT) is a serious complication of heparin use. This study reports a rare case of HIT presenting without thrombocytopenia, highlighting a critical diagnostic challenge in intensive care units.

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Area of Science:

Critical Care Medicine
Hematology
Immunology

Background:

Heparin is a widely used anticoagulant in intensive care units (ICUs) for thromboembolic disease.
Heparin-induced thrombocytopenia (HIT) is a significant immune-mediated complication.
HIT can lead to a severe prothrombotic state.

Observation:

This report details an atypical presentation of HIT.
The patient exhibited signs and symptoms consistent with HIT.
Crucially, the characteristic thrombocytopenia was absent in this case.

Findings:

The diagnosis of HIT was confirmed despite the lack of thrombocytopenia.
This challenges the traditional diagnostic criteria for HIT.
Suggests alternative diagnostic pathways may be necessary.

Implications:

Clinicians should consider HIT even in the absence of thrombocytopenia.
This case broadens the understanding of HIT's clinical spectrum.
Highlights the need for heightened vigilance in ICU patients on heparin therapy.