A 33-year-old woman has had three consecutive first-trimester miscarriages between 8 and 10 weeks of gestation. She has no history of medical illness, but reports a past episode of deep vein thrombosis in her left leg at age 27. Laboratory evaluation demonstrates persistent high-titer anticardiolipin IgG antibodies and a positive lupus anticoagulant verified on two occasions 12 weeks apart. What is the diagnosis, and what is the evidence-based pharmacological regimen recommended during her next pregnancy?
Answer and explanation
Correct answer: B. Antiphospholipid Syndrome (APS); low-dose Aspirin and prophylactic LMWH
- Step 1: The patient meets the Sydney criteria for Antiphospholipid Syndrome (APS): vascular thrombosis or obstetric morbidity (>= 3 consecutive miscarriages < 10 weeks) paired with persistent antiphospholipid antibodies (anticardiolipin, anti-beta-2-glycoprotein I, or lupus anticoagulant) documented >= 12 weeks apart.
- Step 2: In pregnant women with APS and prior recurrent pregnancy loss, combination therapy with low-dose aspirin (75-100 mg daily) and prophylactic-dose LMWH (e.g., Enoxaparin 40 mg daily) significantly improves live birth rates (>70-80%).
- Step 3: Warfarin is strictly contraindicated in early pregnancy due to teratogenicity (warfarin embryopathy).
Answer
Antiphospholipid Syndrome (APS); low-dose Aspirin and prophylactic LMWH.
Why not the others: 'High-dose Prednisone' increases gestational diabetes and preterm delivery risks without improving APS pregnancy outcomes; 'Warfarin throughout pregnancy' causes chondrodysplasia punctata and microcephaly; 'Monthly IVIG' is expensive and reserved only for refractory cases failing heparin/aspirin.
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