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Introduction to Hemostasis

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...

Venous Thrombosis III: Interprofessional Care

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...

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...

Clot Retraction and Fibrinolysis

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.

Formation of the Platelet Plug

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...

Extrinsic and Intrinsic Pathways of Hemostasis

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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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Related Experiment Video

Updated: May 13, 2026

Intravital Microscopy and Thrombus Induction in the Earlobe of a Hairless Mouse

Intravital Microscopy and Thrombus Induction in the Earlobe of a Hairless Mouse

Published on: April 2, 2017

[Gelatin-thrombin matrix-mediated hemostasis: application in tonsillectomy].

C Mozet¹, C Prettin, M Dietze

¹Klinik und Poliklinik für Hals-, Nasen-, Ohrenheilkunde/Plastische Operationen, Universität Leipzig, Liebigstrasse 10-14, 04103, Leipzig, Deutschland. christian.mozet@medizin.uni-leipzig.de

|March 7, 2013

Summary

FloSeal (FS), a local thrombin hemostat, effectively controls bleeding after tonsillectomy, reducing postoperative pain and improving healing. It also decreases operating time for less experienced surgeons without increasing hemorrhage risk.

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Application of Hemostatic Devices in Laparoscopic Hepatectomy

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Last Updated: May 13, 2026

Intravital Microscopy and Thrombus Induction in the Earlobe of a Hairless Mouse

Intravital Microscopy and Thrombus Induction in the Earlobe of a Hairless Mouse

Published on: April 2, 2017

Application of Hemostatic Devices in Laparoscopic Hepatectomy

Application of Hemostatic Devices in Laparoscopic Hepatectomy

Published on: April 19, 2022

Area of Science:

Otolaryngology
Surgical Innovation
Hemostasis Techniques

Context:

Cold knife tonsillectomy is a common procedure for chronic tonsillitis and tonsillar hypertrophy.
Thermal coagulation is typically used for hemostasis, but its omission is being explored.
Evaluating alternative hemostatic agents is crucial for improving patient outcomes and surgical efficiency.

Purpose:

To assess the feasibility of omitting thermal coagulation after cold knife tonsillectomy.
To compare the efficacy of a local thrombin hemostat (FloSeal, FS) versus bipolar electrocautery (EK) for hemostasis.
To evaluate the impact of FS on postoperative pain, wound healing, operating time, and hemorrhage rates.

Summary:

A randomized trial of 181 patients undergoing tonsillectomy compared FloSeal (FS) to bipolar electrocautery (EK).
FS significantly reduced postoperative pain intensity and duration (p < 0.001).
Wound healing appeared improved with FS, and operating time was reduced for inexperienced surgeons (p = 0.05), with no significant difference in hemorrhage rates.

Impact:

FloSeal provides effective hemostasis, leading to reduced postoperative pain and accelerated wound healing.
The use of FS can decrease operative time, particularly for surgeons with less experience.
This study supports the potential of FS as a viable alternative to thermal coagulation in tonsillectomy, enhancing patient recovery and surgical efficiency.