Question

Which thrombophilic (hypercoagulable) condition is most strongly linked to an increased risk of developing ischemic stroke?

• A. Antiphospholipid antibody syndrome
• B. Antithrombin III deficiency
• C. Factor V Leiden mutation
• D. Protein S deficiency

Hint:

Suspect Antiphospholipid Syndrome in any young patient presenting with an unprovoked ischemic stroke, recurrent late fetal losses (miscarriages), and a history of unprovoked DVT/PE.

Answer 1

The Correct Option is A

Concept:
Thrombophilias (prothrombotic states) are conditions that predispose individuals to form abnormal blood clots.
A crucial distinction in clinical hematology and neurology is differentiating between thrombophilias that primarily cause venous clots versus those capable of causing arterial clots (like an ischemic stroke).
Explanation:
• The classic inherited thrombophilias include Factor V Leiden mutation, Prothrombin gene mutation, Antithrombin III deficiency, and Protein C or S deficiency.

• These inherited conditions heavily predispose patients to Venous Thromboembolism (VTE), manifesting primarily as Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE). They are very rarely the direct cause of an arterial thrombosis (such as an ischemic stroke) unless a right-to-left shunt (like a patent foramen ovale) allows a paradoxical venous embolus to reach the brain.

• In contrast, Antiphospholipid Antibody Syndrome (APS) is an acquired, autoimmune thrombophilia characterized by the presence of autoantibodies (Lupus anticoagulant, anticardiolipin, or anti-beta-2-glycoprotein I).

• APS is unique and notorious for its potent propensity to cause BOTH venous and arterial thrombotic events.

• Arterial thrombosis in APS frequently targets the cerebral vasculature, making ischemic stroke and transient ischemic attacks (TIAs) extremely common clinical manifestations, particularly in young patients without traditional atherosclerotic risk factors.

• Therefore, APS is the condition most strongly and directly linked to an increased risk of ischemic stroke among the provided choices.
Final answer:
Antiphospholipid antibody syndrome has the strongest association with arterial thrombosis, leading to ischemic stroke.