# A 60-year-old client with confirmed heparin-induced thrombocytopenia (HIT) has a platelet count of 38,000/μL with no active bleeding. The provider is considering platelet transfusion. Which response by the nurse demonstrates correct evidence-based knowledge?

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> subject: Medical Emergencies  
> category: PA

## Question

A 60-year-old client with confirmed heparin-induced thrombocytopenia (HIT) has a platelet count of 38,000/μL with no active bleeding. The provider is considering platelet transfusion. Which response by the nurse demonstrates correct evidence-based knowledge?

## Option

1. Prophylactic platelet transfusion should be administered for a platelet count below 40,000/μL to prevent spontaneous bleeding, and HIT does not contraindicate this because the immediate risk of hemorrhage in a patient with severe thrombocytopenia outweighs the potential thrombotic complications from added platelets.
2. For a patient with confirmed HIT and a platelet count of 38,000/μL, switching to low molecular weight heparin at a reduced dose (such as enoxaparin 0.5 mg/kg twice daily) is recommended because LMWH has minimal cross-reactivity with HIT antibodies, allowing gradual platelet recovery while maintaining anticoagulation for stroke prevention.
3. For a patient with confirmed HIT and a platelet count of 38,000/μL, restarting unfractionated heparin at a low prophylactic infusion rate (e.g., 5 units/kg/hour) can safely maintain anticoagulation for stroke prevention while allowing gradual platelet recovery, as the platelet count is not critically low and bleeding risk is minimal.
4. Platelet transfusion should generally be AVOIDED in HIT (and reserved for life-threatening bleeding only) because added platelets can fuel further IgG-PF4 mediated thrombosis; treatment focuses on stopping ALL heparin (UFH/LMWH) and starting a non-heparin anticoagulant such as argatroban or fondaparinux. **✔ Correct answer**

**Correct answer: 4**

## Explanation

HIT — platelet transfusion controversy
HIT is paradoxically prothrombotic despite low platelet count. The mechanism (IgG antibodies to PF4-heparin) consumes circulating platelets via thrombosis, NOT bleeding. Adding platelet transfusion can fuel further antibody-mediated platelet activation and thrombosis.

Current ASH 2018 / CHEST guideline:
• AVOID prophylactic platelet transfusion in HIT.
• Transfusion is reserved for active major bleeding or imminent procedure with high bleeding risk.
• Stop ALL heparin (UFH and LMWH — class effect, ~85% cross-reactivity) and start non-heparin anticoagulant: argatroban (preferred in renal impairment), bivalirudin, or fondaparinux.
• Anti-PF4 ELISA + functional assay (SRA) for confirmation.
• Avoid warfarin until platelets ≥150 K (early warfarin causes venous limb gangrene from protein C drop).
• Lifetime heparin avoidance — alert band, MAR/EHR alert.

Options 3 and 4 (LMWH or UFH continuation) are both wrong because of class cross-reactivity (~85%). Option 1 (prophylactic platelet) feeds the disease.

## In-depth explanation

Clinical reasoning summary
HIT — platelet transfusion controversy
HIT is paradoxically prothrombotic despite low platelet count. The mechanism (IgG antibodies to PF4-heparin) consumes circulating platelets via thrombosis, NOT bleeding. Adding platelet transfusion can fuel further antibody-mediated platelet activation and thrombosis.

Current ASH 2018 / CHEST guideline:
• AVOID prophylactic platelet transfusion in HIT.
• Transfusion is reserved for active major bleeding or imminent procedure with high bleeding risk.
• Stop ALL heparin (UFH and LMWH — class effect, ~85% cross-reactivity) and start non-heparin anticoagulant: argatroban (preferred in renal impairment), bivalirudin, or fondaparinux.
• Anti-PF4 ELISA + functional assay (SRA) for confirmation.
• Avoid warfarin until platelets ≥150 K (early warfarin causes venous limb gangrene from protein C drop).
• Lifetime heparin avoidance — alert band, MAR/EHR alert.

Options 3 and 4 (LMWH or UFH continuation) are both wrong because of class cross-reactivity (~85%). Option 1 (prophylactic platelet) feeds the disease.

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