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Waleed Zia: The Balance Between Bleeding and Thrombosis

Waleed Zia/LinkedIn

May 10, 2026, 08:11

Waleed Zia: The Balance Between Bleeding and Thrombosis

Waleed Zia, Anesthesia Specialist at The Indus Hospital, shared a post on LinkedIn:

“Coagulation Pathway – A Visual Guide to Hemostasis

This infographic provides a clear and structured overview of the blood coagulation cascade, illustrating how the body prevents excessive bleeding through a highly regulated and coordinated process known as hemostasis.

The poster is divided into three main sections:

1. Intrinsic Pathway

Activated by contact with negatively charged surfaces inside the blood vessel.
Involves coagulation factors XII, XI, IX, and VIII.
Leads to activation of Factor X.
Commonly assessed by aPTT (activated partial thromboplastin time).

2. Extrinsic Pathway

Triggered by tissue injury outside the vessel.
Initiated by Tissue Factor (Factor III).
Involves Factor VII.
Rapid pathway that also activates Factor X.
Commonly assessed by PT/INR (prothrombin time/international normalized ratio).

3. Common Pathway

Begins at Factor X activation.
Factor Xa converts Prothrombin (Factor II) into Thrombin (Factor IIa).
Thrombin converts Fibrinogen (Factor I) into Fibrin.
Factor XIII stabilizes the fibrin clot through cross-linking.
Results in a stable fibrin clot that stops bleeding.

Key Components Highlighted in the Diagram

Role of Calcium (Ca²⁺) as an essential cofactor.
Importance of phospholipid (PL) surfaces.
Activated factors are clearly labeled with ‘a’.
Color coding to differentiate intrinsic, extrinsic, and common pathways.

Clinical Relevance

The poster also emphasizes practical medical applications:

Helps in understanding bleeding disorders (e.g., hemophilia).
Useful in monitoring anticoagulation therapy (e.g., warfarin, heparin).
Essential for interpreting coagulation laboratory tests.
Guides decision-making in surgery and transfusion medicine.

Core Message

Hemostasis is a delicate balance:

Too little clotting – bleeding
Too much clotting – thrombosis

The infographic reinforces the concept that proper regulation of the coagulation cascade is vital for maintaining vascular integrity and overall patient safety.”

Waleed Zia: The Balance Between Bleeding and Thrombosis