Recent oral direct thrombin inhibitor which can be used for prevention of stroke is:
**Core Concept**
Direct thrombin inhibitors (DTIs) are a class of anticoagulants that prevent thrombin from converting fibrinogen into fibrin, thereby inhibiting blood clot formation. They are used to prevent stroke in patients with atrial fibrillation or venous thromboembolism.
**Why the Correct Answer is Right**
The correct answer is a recent oral direct thrombin inhibitor that has been approved for the prevention of stroke in patients with non-valvular atrial fibrillation. It works by directly inhibiting thrombin, which is a key enzyme in the coagulation cascade. This leads to a decrease in the formation of thrombi and a subsequent reduction in the risk of stroke.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is an incorrect choice because it is not a direct thrombin inhibitor. Direct thrombin inhibitors work by directly inhibiting thrombin, whereas this option is an indirect thrombin inhibitor.
* **Option B:** This is an incorrect choice because it is not an oral direct thrombin inhibitor. This option is a parenteral direct thrombin inhibitor that is used for the treatment of thrombosis.
* **Option D:** This is an incorrect choice because it is not a direct thrombin inhibitor. This option is an indirect anticoagulant that works by inhibiting factor Xa.
**Clinical Pearl / High-Yield Fact**
Direct thrombin inhibitors are more specific than warfarin, which is a vitamin K antagonist that inhibits multiple steps in the coagulation cascade. This makes direct thrombin inhibitors a safer option for patients with a high risk of bleeding.
**Correct Answer: D. Dabigatran**