Hematology Upgrade EP.4 | Approach to Coagulopathy

Welcome back to the Hematology Upgrade series! In this episode, we dive into the clinical approach to Coagulopathy. We will simplify the complex coagulation cascade, explore the diagnostic interpretation of PT and aPTT, and discuss the management of both inherited and acquired bleeding disorders. In this video, we cover: The Coagulation Cascade: A simplified look at the Intrinsic, Extrinsic, and Common pathways. The Shortcut Formula: 12-11-9-8 (Intrinsic), 3+7 (Extrinsic), and 5-2-1 (Common). Secondary Hemostasis Disorders: Clinical features of coagulation factor deficiencies, such as delayed bleeding, large ecchymosis, and Hemarthrosis. Intrinsic Pathway & Isolated aPTT Prolongation: Hemophilia A and B: Differentiating Factor 8 and Factor 9 deficiencies, including calculation rules for factor replacement (1 unit/kg increases Factor 8 by 2%). Von Willebrand Disease (vWD): Understanding severe cases that impact the intrinsic pathway. Heparin Coagulopathy: How anti-thrombin III inhibitors affect the aPTT. Extrinsic Pathway & Isolated PT Prolongation: Factor 7 Deficiency: The significance of its short half-life. Vitamin K Deficiency: Causes including malabsorption, antibiotics, and the early effects of Warfarin. Common Pathway & Combined Prolongation (PT + aPTT): Liver Cirrhosis: Why the liver is central to clotting factor production (except Factor 8 and vWF) and its role in TPO production. DIC (Disseminated Intravascular Coagulation): Understanding the consumption of factors, high D-dimer, and the presence of Schistocytes on blood smears. Diagnostic Investigation: Mixing Study: Differentiating between factor deficiency (corrected) and factor inhibitors (not corrected). Specific Factor Assays: Moving from screening tests to a definitive diagnosis. This lesson provides a comprehensive roadmap for medical students and clinicians to approach bleeding patients with a structured, diagnostic mindset. 📌 NinjaBoss: Hematology Upgrade Playlist    • NinjaBoss: Hematology Upgrade   Timestamps: 0:00 Intro and the Coagulation Cascade 1:09 Intrinsic vs. Extrinsic Pathways 2:10 Platelet Aggregation and Fibrin Cross-linking 3:06 Fibrinolysis and D-dimer 4:03 Secondary Hemostasis Clinical Signs 5:42 Intrinsic Pathway: Isolated aPTT Prolongation 6:21 Hemophilia A and B (A8, B9) 7:22 Management and Factor Replacement Calculations 9:29 Severe vWD and Heparin 10:48 Lupus Anticoagulant and APS 11:08 Extrinsic Pathway: Isolated PT/INR Prolongation 11:51 Vitamin K Deficiency and Warfarin 13:22 Common Pathway: Combined PT and aPTT Prolongation 13:50 Liver Cirrhosis and Hematologic Impacts 16:03 DIC: Pathophysiology and Smear Findings 18:09 Diagnostic Strategy: CBC to Mixing Study 20:06 Summary and Conclusion If you found this video helpful, please Like, Subscribe, and hit the Notification Bell to follow the Hematology Upgrade series by NinjaBoss! 👇    / @ninjaboss_th   #Hematology #Coagulopathy #Hemophilia #DIC #MedicalEducation #USMLE #InternalMedicine #NinjaBoss