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Extrinsic and Intrinsic Pathways of Hemostasis

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...

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...

Epistaxis

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...

Vascular Spasm

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...

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,...

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.

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Related Experiment Video

Updated: Dec 30, 2025

Experimental Model of Ligature-Induced Peri-Implantitis in Mice

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Time required for haemostasis under pressure from dental extraction socket.

Saurabh Kumar¹, Arun Paul¹, Rabin Chacko¹

¹Department of Dental and Oral Surgery, Christian Medical College and Hospital, Vellore, Tamil Nadu, India.

Indian Journal of Dental Research : Official Publication of Indian Society for Dental Research

|January 16, 2020

Summary

Dental extraction sockets achieve hemostasis quickly, with most bleeding stopping within 10 minutes. This suggests shorter pressure times are sufficient for adequate clot formation in healthy patients.

Keywords:

Extraction socket packing hemostasis tooth extraction

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Area of Science:

Dental Surgery
Oral Medicine
Hemostasis Research

Background:

Physiological bleeding time is typically 2-9 minutes.
Conventional estimates for dental socket hemostasis range from 20-40 minutes.
The precise timing of socket hemostasis remains unclear in dental practice.

Purpose of the Study:

To quantify the average time required for hemostasis in a dental extraction socket.
To determine if hemostasis occurs earlier than conventionally assumed.

Main Methods:

Evaluated 1205 consecutive patients undergoing dental extractions.
Excluded children, pregnant women, and those with bleeding disorders or on anticoagulants.
Monitored socket bleeding at 5, 10, and 15 minutes post-extraction.

Main Results:

83% of patients achieved hemostasis in under 5 minutes.
96.5% of patients achieved hemostasis within 10 minutes.
Prolonged bleeding beyond 10 minutes was rare and manageable.

Conclusions:

Checking for hemostasis after 5-10 minutes of pressure is a valuable risk management step.
This practice helps identify potential hemorrhagic tendencies before patient discharge.
Adequate hemostasis is typically achieved rapidly in healthy individuals.