Source / episode info
- **Episode:**180
- **Title:**Divine Intervention Episode 180 – Hematology For The Surgery Shelf Exam.
- **Published:**2019-11-01
- Source:Episode page
One-liner
This episode provides a high-yield review of hematology, covering macrocytic/microcytic anemias (B12/folate deficiency, sideroblastic anemia), inherited cytopenias (Hereditary Spherocytosis), toxin effects on hemoglobin (Methemoglobinemia), and complex coagulation disorders including Factor V Leiden, HIT, and hemophilias.
High-yield summary
- Anemias: Macrocytic anemias are often megaloblastic (B12/folate deficiency) or due to hemolysis (e.g., HS). Microcytic anemia with elevated LDH suggests chronic hemolysis. Sideroblastic anemia is associated with B6 deficiency and myelodysplastic syndromes.
- Coagulation Defects: The most common hypercoagulable states include Factor V Leiden mutation, Protein C/S deficiencies, and Antithrombin III deficiency. Conversely, bleeding disorders range from Von Willebrand Disease (VWD) to ITP and Glanzmann thrombasthenia.
- Toxin Management: Methemoglobinemia is treated with Methylene Blue; Cyanide poisoning requires inducing methemoglobinemia using a strong oxidizing agent (e.g., amyl nitrite) followed by thiosulfate.
- Anticoagulation/Transfusion: Warfarin reversal uses the 4-factor Prothrombin Complex Concentrate (PCC), not Fresh Frozen Plasma (FFP). Mechanical heart valves require lifelong anticoagulation with Warfarin.
- HIT Management: Heparin-Induced Thrombocytopenia (HIT) is a hypercoagulable state requiring immediate cessation of heparin and replacement with a direct thrombin inhibitor (Argatroban) or Factor IIa inhibitor (Bivalirudin).
Learning objectives
- Differentiate between various types of macrocytic, microcytic, and normocytic anemias based on underlying pathophysiology (e.g., megaloblastic vs hemolytic).
- Recognize the clinical signs and appropriate management for acute coagulopathies such as HIT, VWD, and warfarin toxicity.
- Understand the mechanism and treatment of methemoglobinemia and cyanide poisoning.
- Apply knowledge of specific genetic/acquired hypercoagulable states (e.g., Factor V Leiden) and their associated testing protocols.
- Correlate clinical findings with the appropriate management for mechanical heart valves and valvular disease complications.
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