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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.
Epistaxis01:30

Epistaxis

Epistaxis, or nosebleeds, occurs when small, swollen blood vessels in the nasal mucous membrane rupture. Typically, the anterior septum is the primary site of occurrence.
Etiology
Possible causes of this condition include high blood pressure, trauma, low humidity, upper respiratory tract infections, allergies, foreign bodies, nasal inhalation of corticosteroids or illicit drugs, excessive use of decongestant nasal sprays, facial or nasal surgery, anatomic malformation, tumors, or systemic...
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...
Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
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,...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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...

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Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice
08:13

Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice

Published on: September 30, 2021

Can we predict bleeding?

Henry G Watson1, Mike Greaves

  • 1Aberdeen Royal Infirmary and University of Aberdeen, Aberdeen, Scotland. Henry.Watson@arh.grampian.scot.nhs.uk

Seminars in Thrombosis and Hemostasis
|April 9, 2008
PubMed
Summary
This summary is machine-generated.

Predicting surgical bleeding risk is crucial. A structured clinical history questionnaire, yielding a bleeding score, shows high accuracy in identifying bleeding disorders, outperforming traditional lab tests.

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Area of Science:

  • Hematology
  • Surgical Oncology
  • Clinical Diagnostics

Background:

  • Accurate prediction of excessive bleeding risk before surgery is clinically significant.
  • Current reliance on laboratory coagulation screening tests is suboptimal due to low sensitivity and specificity.
  • Existing global assays are not established for predicting bleeding in general populations.

Purpose of the Study:

  • To evaluate the efficacy of clinical history assessment for predicting bleeding risk.
  • To determine if a structured questionnaire can effectively identify individuals prone to excessive bleeding.
  • To compare the predictive value of clinical history with traditional laboratory tests.

Main Methods:

  • Utilizing a structured questionnaire to gather detailed clinical history related to bleeding tendencies.
  • Deriving a 'bleeding score' based on responses to the questionnaire.
  • Assessing the positive predictive value of this bleeding score for identifying bleeding disorders.

Main Results:

  • Structured clinical history questionnaires demonstrate a high positive predictive value for detecting bleeding disorders.
  • This approach shows promise as an efficient method for predicting bleeding risk in unselected populations.
  • Traditional laboratory screening tests lack the necessary sensitivity and specificity for reliable bleeding risk prediction.

Conclusions:

  • Clinical history, particularly when systematically collected via a structured questionnaire, is a valuable tool for predicting surgical bleeding risk.
  • The derived bleeding score offers a more reliable method for identifying patients at risk compared to conventional laboratory tests.
  • Further validation of this clinical history-based approach could improve patient safety during invasive procedures.