Shaswat, A 67–year–old male comes to the physician’s office complaining of severe pain in the right foot with paleness of right toe. The patient had a history of receiving unfractionated heparin 7 days back. The hemogram of the patient is as shown below:Hb – 13.2 g/dLWBC – 10000/mm3Platelet – 50000/mm3 Which of the following should be used to treat this condition?

**Core Concept**
The patient's presentation is suggestive of Heparin-Induced Thrombocytopenia (HIT), a serious adverse effect of heparin therapy characterized by a decrease in platelet count and an increased risk of thrombosis.

**Why the Correct Answer is Right**
HIT occurs due to the formation of antibodies against the complex of heparin and platelet factor 4 (PF4), which activates platelets and leads to a prothrombotic state. The treatment of HIT involves discontinuing all forms of heparin and initiating an alternative anticoagulant to prevent further thrombosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Protamine sulfate is used to reverse the anticoagulant effects of heparin, but it is not indicated in the treatment of HIT, as it can also bind to and neutralize the antibodies against the heparin-PF4 complex.
**Option B:** Aspirin is an antiplatelet agent that can worsen the prothrombotic state in HIT and is not recommended as a treatment option.
**Option C:** Fondaparinux is a synthetic anticoagulant that is structurally related to heparin and can also induce HIT. It is not a suitable alternative in the treatment of HIT.

**Clinical Pearl / High-Yield Fact**
Remember that in patients with suspected HIT, it is essential to discontinue all forms of heparin and initiate an alternative anticoagulant within 4-8 hours to prevent further thrombosis.

**Correct Answer:** C. Argatroban.

✓ Correct Answer: C. Argatroban