In suspected heparin-induced thrombocytopenia, what is the initial management step?

• A. Stop heparin
• B. Continue heparin
• C. Start warfarin
• D. Platelet transfusion

Answer: (A)

In suspected heparin-induced thrombocytopenia, the first step is to stop all heparin exposure. The reaction is an immune-mediated process where antibodies form against the PF4‑heparin complex, activating platelets and driving thrombosis while causing low platelets. Removing the heparin antidrogen minimizes ongoing platelet activation and thrombus risk. After stopping heparin, switch to a non-heparin anticoagulant (such as a direct thrombin inhibitor or fondaparinux) to protect against thrombosis while the immune reaction abates. Warfarin should not be started during the acute phase because it can worsen the hypercoagulable state and cause skin necrosis; it’s used only after platelet counts recover and with overlap of a non-heparin anticoagulant. Platelet transfusion is not routinely indicated, as it can fuel thrombosis unless there is life-threatening bleeding.