AIM STEP 10
Student Memory Support
Bleeding, Clotting & Hypercoagulable Disorders
4TH Year MBBS • High-yield memory reinforcement • Rapid KMU exam revision
Structured according to the supplied AIM Student Memory Support requirements. :contentReference[oaicite:0]{index=0}
1. High-Yield Flashcards
Tap each question to reveal the answer.
Which bleeding pattern suggests a primary hemostatic defect?
Petechiae, purpura, epistaxis and other mucosal bleeding.
Which bleeding pattern suggests a coagulation-factor defect?
Hemarthrosis, deep muscle hematoma and delayed bleeding.
What is the typical screening pattern in Hemophilia A?
Normal platelet count and PT with prolonged APTT.
What does correction of a prolonged clotting test after a mixing study suggest?
A coagulation-factor deficiency rather than an inhibitor.
What laboratory pattern strongly supports DIC?
Low platelets, prolonged PT/APTT, low fibrinogen and raised FDPs.
What are the two major hemostatic functions of von Willebrand factor?
It supports platelet adhesion and stabilizes circulating Factor VIII.
Which laboratory pattern is typical of immune thrombocytopenia?
Isolated thrombocytopenia with normal PT and APTT.
What is the Factor VIII dose formula used in the learning material?
Required IU = weight in kg × desired Factor VIII rise (%) × 0.5.
Which treatment may increase endogenous vWF and Factor VIII in suitable mild von Willebrand disease?
Desmopressin.
When is vWF-containing concentrate considered in von Willebrand disease?
Severe bleeding, major surgery or inadequate/unsuitable desmopressin response.
What should be suspected when Factor VIII replacement produces a poor expected response?
Development of a Factor VIII inhibitor.
What three processes form Virchow’s triad?
Venous stasis, endothelial injury and hypercoagulability.
Name important inherited hypercoagulable states from this topic.
Factor V Leiden, prothrombin mutation, antithrombin deficiency and Protein C/S deficiency.
What is the basic management principle for established venous thromboembolism?
Appropriate anticoagulation when there is no major contraindication.
2. Mnemonics
Mnemonic Title: Primary Hemostasis Bleeding
PEM
Meaning: Petechiae • Epistaxis • Mucosal bleeding → think platelets/vWF.
Mnemonic Title: Virchow’s Triad
SEH
Meaning: Stasis • Endothelial injury • Hypercoagulability.
Mnemonic Title: Inherited Thrombophilia
F-PAPS
Meaning: Factor V Leiden • Prothrombin mutation • Antithrombin deficiency • Protein C deficiency • S protein deficiency.
3. Memory Tables
Primary vs Secondary Hemostatic Defects
| Feature | Primary Hemostasis Defect | Secondary Hemostasis Defect |
|---|---|---|
| Main problem | Platelet / vWF | Coagulation factors |
| Typical bleeding | Petechiae, epistaxis, mucosal | Hemarthrosis, muscle hematoma |
| Timing | More immediate | May be delayed or recurrent |
| Useful tests | Platelet count, BT, vWF tests | PT, APTT, factor assays |
ITP vs von Willebrand Disease vs Hemophilia A
| Feature | ITP | vWD | Hemophilia A |
|---|---|---|---|
| Main defect | Low platelets | vWF dysfunction/deficiency | Factor VIII deficiency |
| Bleeding | Petechiae, purpura | Mucosal bleeding | Deep bleeding, hemarthrosis |
| Platelets | Low | Normal | Normal |
| APTT | Normal | Normal or prolonged | Prolonged |
4. Rapid Revision Points — Last-Minute Revision
Must Remember:
- Petechiae are tiny non-blanching cutaneous hemorrhages.
- Mucosal bleeding points toward platelet/vWF dysfunction more than a coagulation-factor defect.
- Hemarthrosis and deep muscle bleeding strongly suggest secondary-hemostasis failure.
- A normal platelet count does not exclude von Willebrand disease.
- ITP produces isolated thrombocytopenia; PT and APTT remain normal.
- Hemophilia A produces a prolonged APTT with normal PT and platelet count.
- Low fibrinogen plus raised FDPs supports a consumptive process such as DIC.
- Factor VIII replacement is given intravenously and calculated from body weight and desired rise.
- Inherited thrombophilia includes Factor V Leiden and deficiencies of Protein C, Protein S or antithrombin.
- Thrombosis prevention combines early mobilization, mechanical methods and pharmacological prophylaxis according to risk.
- Anticoagulation decisions must balance thrombotic benefit against bleeding risk.
KMU Exam Trap: Normal PT and APTT do not exclude a clinically important bleeding disorder; mild von Willebrand disease or qualitative platelet dysfunction may still be present.
5. Clinical Memory Hooks
Boy with recurrent swollen painful joints after minor trauma
→
think coagulation-factor deficiency, especially Hemophilia A.
→
think coagulation-factor deficiency, especially Hemophilia A.
Child with petechiae, low platelets and normal PT/APTT
→
think immune thrombocytopenia.
→
think immune thrombocytopenia.
Epistaxis plus heavy menstrual bleeding with normal platelet count
→
consider von Willebrand disease.
→
consider von Willebrand disease.
Immobilized postoperative patient
→
venous stasis raises VTE risk; mobilization and appropriate prophylaxis reduce risk.
→
venous stasis raises VTE risk; mobilization and appropriate prophylaxis reduce risk.
⭐ 6. Starred High-Yield Exam Points
- ⭐ Primary hemostasis: platelet/vWF dysfunction → mucocutaneous bleeding.
- ⭐ Hemophilia A: Factor VIII deficiency → prolonged APTT + deep bleeding/hemarthrosis.
- ⭐ ITP: isolated thrombocytopenia with normal PT and APTT.
- ⭐ DIC pattern: low platelets + prolonged PT/APTT + low fibrinogen + raised FDPs.
- ⭐ Factor VIII dose: weight × desired percentage rise × 0.5.
- ⭐ Virchow’s triad: stasis + endothelial injury + hypercoagulability → thrombosis.