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Related Concept Videos

Introduction to Hemostasis01:05

Introduction to Hemostasis

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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,...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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

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Application of Hemostatic Devices in Laparoscopic Hepatectomy
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Hemostatic function to regulate perioperative bleeding in patients undergoing spinal surgery: A prospective

Atsushi Kimura1, Tsukasa Ohmori2, Asuka Sakata3

  • 1Department of Orthopaedics, Jichi Medical University School of Medicine, Tochigi, Japan.

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Predicting surgical bleeding risk is crucial. This study found platelet function and low plasminogen-activator inhibitor-1 (PAI-1) levels are key indicators, even in patients without bleeding disorders.

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Area of Science:

  • Hemostasis and Thrombosis
  • Surgical Complications
  • Clinical Laboratory Science

Background:

  • Routine laboratory tests poorly predict perioperative bleeding.
  • Understanding hemostatic mechanisms can identify high-risk surgical patients.
  • Cervical spinal surgery patients without bleeding diathesis were studied.

Purpose of the Study:

  • To elucidate hemostatic mechanisms for predicting perioperative bleeding.
  • To identify independent risk factors for intraoperative and postoperative bleeding.
  • To assess the role of platelet function and fibrinolysis in surgical bleeding.

Main Methods:

  • Prospective enrollment of 104 patients undergoing cervical spinal surgery.
  • Preoperative blood sampling for detailed hemostatic function tests.
  • Comparison of blood loss volumes with primary hemostasis, secondary hemostasis, and fibrinolysis assays.

Main Results:

  • Platelet aggregability was an independent predictor of perioperative bleeding.
  • Low plasminogen-activator inhibitor-1 (PAI-1) and α2-plasmin inhibitor levels were risk factors for intraoperative and postoperative bleeding, respectively.
  • Body weight was the most significant factor for postoperative bleeding; obese patients with low PAI-1 were at high risk.

Conclusions:

  • Inter-individual differences in hemostatic function, including platelet function and fibrinolysis, influence surgical bleeding.
  • Platelet function and specific inhibitor levels are critical for predicting bleeding risk.
  • Novel risk factors identified may improve patient stratification for surgical procedures.