A 35-Year-Old Woman with Sudden Weakness and Digital Ischemia

🧠 Internal Medicine Quiz: Antiphospholipid Syndrome (APS)

📖 History

• 35-year-old woman
• Sudden right-sided weakness
• History of blackening of fingers (digital ischemia)
• Two missed abortions

🩺 Examination

• Right-sided focal neurological deficit
• Digital ischemia / finger gangrene
• Features suggestive of arterial thrombosis

🔬 Investigations

• MRI/CT brain → ischemic stroke
• Coagulation profile
• Autoantibody screening
• Antiphospholipid antibody panel

❓ MCQ Question

Which autoantibody is most likely to be positive?

A. Anti-dsDNA

B. Anti-centromere

C. Lupus anticoagulant

D. Anti-Jo-1

📋 Brief Case Summary

Young woman with recurrent pregnancy loss, digital ischemia and acute ischemic stroke suggesting an autoimmune hypercoagulable state.

✅ Clickable Answer

Show Answer

✔ Correct Answer: C. Lupus anticoagulant

📚 Answer Explanation

This patient has the classic triad of:

• Arterial thrombosis (ischemic stroke)
• Digital ischemia
• Recurrent pregnancy loss

These findings strongly suggest Antiphospholipid Syndrome (APS). Lupus anticoagulant is one of the major antiphospholipid antibodies responsible for thrombosis and recurrent fetal loss.

❌ Why Not Others?

Option	Reason Incorrect
Anti-dsDNA	Marker of SLE, not specific for recurrent thrombosis.
Anti-centromere	Associated with limited systemic sclerosis (CREST).
Anti-Jo-1	Associated with polymyositis and interstitial lung disease.
Lupus anticoagulant	Classic APS antibody causing thrombosis and miscarriages.

🩺 Five Brief Case Scenarios

• Young woman with DVT and recurrent miscarriages → APS.
• Stroke before age 40 with positive lupus anticoagulant.
• Digital gangrene with prolonged aPTT.
• SLE patient with pulmonary embolism.
• Three recurrent fetal losses with anticardiolipin positivity.

⚙️ Pathophysiology Simplified

Antiphospholipid antibodies activate platelets, endothelial cells and coagulation pathways, producing a hypercoagulable state that causes arterial thrombosis, venous thrombosis and placental thrombosis.

🔍 Physical Examination Pearls

• Look for livedo reticularis.
• Assess digital ischemia.
• Evaluate focal neurological deficits.
• Check peripheral pulses.
• Search for DVT signs.

🧪 Investigations Choosing Wisely

• Lupus anticoagulant assay.
• Anticardiolipin antibody.
• Anti-β2 glycoprotein-I antibody.
• Repeat testing after 12 weeks.
• Brain MRI for ischemic lesions.

💊 Management

• Acute stroke treatment.
• Long-term anticoagulation.
• Control cardiovascular risk factors.
• Aspirin + LMWH during pregnancy.
• Regular thrombosis surveillance.

🔄 Differential Diagnosis

• Systemic Lupus Erythematosus
• Inherited thrombophilia
• Vasculitis
• Cardioembolic stroke
• Thromboangiitis obliterans

⚠️ Clinical Pitfalls

• Ignoring recurrent miscarriages.
• Misinterpreting prolonged aPTT as bleeding risk.
• Failing to repeat antibody testing.
• Missing APS in young stroke patients.
• Stopping anticoagulation too early.

💎 Clinical Pearls

• APS = thrombosis + pregnancy morbidity.
• Lupus anticoagulant promotes thrombosis despite prolonged aPTT.
• Young stroke patients require APS evaluation.
• Digital ischemia is a major clue.
• Triple-positive antibodies confer highest risk.

📅 Monitoring & Follow-Up

• Monitor INR if on warfarin.
• Assess recurrent thrombosis.
• Pregnancy surveillance.
• Review antibody profile.
• Annual cardiovascular assessment.

❓ FAQ (Questions with Answers)

1. What is APS?
   Autoimmune thrombophilia causing thrombosis and pregnancy loss.
2. Which antibodies are diagnostic?
   Lupus anticoagulant, anticardiolipin and anti-β2 glycoprotein-I.
3. Why do miscarriages occur?
   Placental thrombosis causes fetal loss.
4. Can APS occur without SLE?
   Yes, primary APS exists.
5. What stroke type occurs?
   Ischemic stroke.
6. What skin finding is classic?
   Livedo reticularis.
7. What vessel types are affected?
   Both arteries and veins.
8. What is catastrophic APS?
   Rapid widespread thrombosis affecting multiple organs.
9. Why repeat antibody testing?
   To confirm persistent positivity.
10. Can APS cause DVT?
    Yes, very commonly.
11. What pregnancy treatment is preferred?
    Low-dose aspirin plus LMWH.
12. Can APS recur?
    Yes, recurrence risk is high.
13. What is the role of warfarin?
    Long-term thrombosis prevention.
14. Which antibody has highest thrombosis risk?
    Lupus anticoagulant.
15. What is the prognosis?
    Good with early diagnosis and proper anticoagulation.

📚 Key Guidelines & References

• EULAR Recommendations for APS Management
• 2023 ACR/EULAR APS Classification Criteria
• Harrison's Principles of Internal Medicine
• Oxford Handbook of Clinical Medicine
• UpToDate: Antiphospholipid Syndrome
• ESC Thrombosis Guidelines

https://www.effectivecpmnetwork.com/p6x5cixrpy?key=0e3ba72754512fdd23ee8b77a5e394ed

🔎 Keywords

Antiphospholipid Syndrome, APS Quiz, Lupus Anticoagulant, Recurrent Miscarriage, Young Stroke, Digital Ischemia, Anticardiolipin Antibody, Autoimmune Thrombosis, Internal Medicine MCQ, Rheumatology Quiz

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