This episode frames coagulation as a dynamic balance—a system designed to seal injury quickly while staying fluid everywhere else. Thrombosis and bleeding represent opposite failures of the same regulatory network. We map the coagulation cascade, platelet activation, and fibrinolysis as interacting processes, then show how anticoagulants, antiplatelet agents, and fibrinolytics intervene at specific control points. The emphasis is on proportionality, timing, and patient context.

Key takeaways you’ll build and reuse throughout the series:

* Haemostasis as a system, not a pathway: platelets, coagulation factors, and fibrinolysis acting together.

* Targets that matter: thrombin and factor Xa as convergent nodes with outsized influence.

* Anticoagulants versus antiplatelets: different problems, different tools, different risks.

* Trade-offs made explicit: efficacy versus bleeding risk, reversibility, monitoring, and drug–drug interactions.

* Clinical reasoning in motion: perioperative management, atrial fibrillation, venous thromboembolism, and secondary prevention.

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