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Assessing the bleeding patient: factors affecting hemostasis and common coagulation studies
Chad P Liedl1, Tammy P Friedrich
1Mayo Clinic-Rochester , Rochester, Minnesota, USA.
Journal of Continuing Education in Nursing
|December 7, 2007
Summary
This article reviews factors influencing hemostasis and common coagulation tests for evaluating bleeding disorders. Understanding these elements is crucial for accurate diagnosis and patient management.
Area of Science:
- Hematology
- Clinical Pathology
Background:
- Hemostasis is a complex physiological process involving platelet activation and coagulation cascade.
- Disruptions in hemostasis can lead to significant bleeding disorders.
Purpose of the Study:
- To discuss the key factors that influence hemostasis.
- To outline common laboratory coagulation studies.
Main Methods:
- Review of scientific literature on hemostasis.
- Description of standard coagulation assays.
Main Results:
- Identified intrinsic and extrinsic pathway factors affecting coagulation.
- Detailed common tests like PT, aPTT, and platelet count.
Conclusions:
- Accurate assessment of hemostasis requires understanding influencing factors.
- Coagulation studies are essential for diagnosing and managing bleeding disorders.
Related Concept Videos
01:24Disorders 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.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
01:09Coagulation
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During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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01:05Introduction to Hemostasis
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.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
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01:20Extrinsic and Intrinsic Pathways of Hemostasis
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The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
The Extrinsic Pathway
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01:30Anticoagulant 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...