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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.
Serum Laboratory Studies, Stool Test, Breath Test01:30

Serum Laboratory Studies, Stool Test, Breath Test

Gastrointestinal (GI) diagnostic studies are pivotal in confirming, ruling out, diagnosing, or staging various diseases, including cancers. Following diagnosis, allocating time for discussions with the patient and providing informational resources is crucial. Diagnostic assessments of the GI tract often occur in outpatient settings like endoscopy suites or GI labs. Preparation for these tests may include dietary restrictions, fasting, liquid bowel preparations, laxatives, enemas, and the...
Esophageal Varices-II: Clinical Features and Management01:28

Esophageal Varices-II: Clinical Features and Management

Esophageal varices often manifest as gastrointestinal bleeding episodes, presenting symptoms like hematemesis (vomiting of blood), hematochezia (passing fresh blood via the rectum), and melena (black, tarry stools). Other signs can include weight loss, anorexia, abdominal discomfort, jaundice, pruritus, altered mental status, and muscle cramps.
In the initial assessment, a thorough review of the patient's medical history is vital to identify risk factors such as liver disease, alcohol abuse, or...
Venous Thrombosis IV: Nursing Management01:30

Venous Thrombosis IV: Nursing Management

Nursing management begins with a thorough assessment of the patient's health history. Key factors include trauma to veins, peripherally inserted central catheters, varicose veins, recent pregnancy or childbirth, surgery, bacteremia, prolonged bed rest, atrial fibrillation, COPD, heart failure, cancer, coagulation disorders, myocardial infarction, spinal cord injury, stroke, prolonged travel, recent bone fractures, and dehydration. Review medication intake, particularly oral contraceptives,...
Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies01:20

Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies

The key difference between Superficial Vein Thrombosis (SVT) and Deep Vein Thrombosis (DVT) lies in their location and severity.Clinical ManifestationsSVT typically presents with localized pain, tenderness, and redness along the course of a superficial vein, often accompanied by a palpable, cord-like structure under the skin. This condition is usually less dangerous than DVT but can be uncomfortable and may lead to complications such as cellulitis or, rarely, a clot extension into the deep...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well
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Laboratory investigations for bleeding disorders.

Catherine P M Hayward1, Karen A Moffat, Yang Liu

  • 1Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada. haywrdc@mcmaster.ca

Seminars in Thrombosis and Hemostasis
|September 27, 2012
PubMed
Summary
This summary is machine-generated.

Standard bleeding disorder tests like PT/INR and APTT are less sensitive to clinically significant abnormalities. Expanded panels including von Willebrand disease (VWD) screens and platelet aggregometry offer improved detection of bleeding disorders.

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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Area of Science:

  • Hematology
  • Clinical Pathology

Background:

  • Bleeding disorder panels commonly include prothrombin time (PT)/international normalized ratio (INR), activated partial thromboplastin time (APTT), fibrinogen, and thrombin time (TT).
  • Evaluating the diagnostic utility of these standard tests is crucial for effective bleeding disorder assessment.

Purpose of the Study:

  • To determine the sensitivity and specificity of common bleeding disorder screening tests and panels.
  • To compare the detection rates of clinically significant abnormalities using different test combinations.

Main Methods:

  • Analysis of data from a bleeding disorder study involving subjects referred for assessment.
  • Calculation of sensitivities and specificities for individual tests and various panel combinations.

Main Results:

  • Coagulation defects were uncommon in the referred population; APTT and TT identified many non-significant abnormalities.
  • Standard coagulation screening tests showed low sensitivity (1.0–2.1%) for significant abnormalities compared to von Willebrand disease (VWD) screens (6.7%) and light transmission platelet aggregometry (LTA) (26%).
  • Panels including VWD screens and LTA demonstrated higher sensitivity (8.5% and 30%) than standard panels (3.7%).

Conclusions:

  • Standard bleeding disorder screening panels lack sufficient sensitivity for clinically significant conditions.
  • Expanded diagnostic panels incorporating VWD screening and LTA are more effective for identifying bleeding disorders.
  • These findings necessitate a re-evaluation of current diagnostic strategies for bleeding disorders.