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Related Concept Videos

Introduction to Hemostasis01:05

Introduction 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...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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...
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,...
Peripheral Artery Disease V: Postoperative Nursing Management01:23

Peripheral Artery Disease V: Postoperative Nursing Management

During the postoperative period, it is crucial to focus on maintaining circulation, identifying and managing potential complications, and planning for discharge.Nursing AssessmentVital signs monitoring: Regularly monitor vital signs, including blood pressure, heart rate, respiratory rate, and temperature, to detect early signs of complications such as bleeding and infection.Circulation assessment: Monitor pulses, perform Doppler assessments, and check capillary refill, color, temperature, and...
Venous Thrombosis III: Interprofessional Care01:29

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...
Cardiomyopathy VII: Pre and Post Operative Nursing Management01:28

Cardiomyopathy VII: Pre and Post Operative Nursing Management

Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...

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Hemocompatibility Testing of Blood-Contacting Implants in a Flow Loop Model Mimicking Human Blood Flow
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Hemocompatibility Testing of Blood-Contacting Implants in a Flow Loop Model Mimicking Human Blood Flow

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[Preoperative hemostasis evaluation].

Angel Gabriel Vargas-Ruiz1

  • 1Departamento de Hematología y Oncología, Instituto Nacional de Ciencias Médicas y Nutrición, Distrito Federal, México. gelocoa@hotmail.com

Revista Medica Del Instituto Mexicano Del Seguro Social
|November 28, 2012
PubMed
Summary
This summary is machine-generated.

Preoperative coagulation tests like PT and aPTT do not reliably predict surgical bleeding. Clinical history is the most effective tool for assessing bleeding risk before procedures.

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Area of Science:

  • Anesthesiology and Perioperative Medicine
  • Hematology

Context:

  • Preoperative evaluation aims to identify patients at risk of bleeding during surgery.
  • Routine coagulation tests include prothrombin time (PT), activated partial thromboplastin time (aPTT), bleeding time (BT), and platelet count.

Purpose:

  • To evaluate the predictive value of routine laboratory coagulation tests for surgical bleeding.
  • To discuss the role of clinical history in assessing preoperative bleeding risk.

Summary:

  • Current evidence indicates that standard coagulation tests have limited ability to predict surgical bleeding.
  • Clinical history remains the most efficient method for identifying patients prone to bleeding.
  • Most surgical bleeding is attributed to surgical technique, not coagulopathy, and is thus unpredictable by laboratory tests.

Impact:

  • Highlights the limitations of traditional coagulation screening in surgical patients.
  • Emphasizes the importance of thorough clinical assessment for bleeding risk stratification.
  • Informs clinical practice regarding the appropriate use and interpretation of preoperative coagulation tests.