Case Report: Heparin resistance as the harbinger of heparin-induced thrombocytopenia in acute pulmonary embolism
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By
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Na Yu
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Fengqiang Wang
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June 18, 2026
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Clinical Scorecard: Case Study: Heparin Resistance as an Early Indicator of Heparin-Induced Thrombocytopenia in Acute Pulmonary Embolism
At a Glance
| Category | Detail |
|---|
| Condition | |
| Key Mechanisms | Pathogenic platelet activation leading to a prothrombotic state, emphasizing the role of PF4/heparin antibodies. |
| Target Population | |
| Care Setting | |
Key Highlights
- Thrombus progression despite high doses of unfractionated heparin highlights the need for immediate diagnostic evaluation.
Guideline-Based Recommendations
Diagnosis
- Monitor platelet counts and assess for heparin resistance, interpreting the 4Ts score for HIT risk assessment.
Management
Monitoring & Follow-up
Risks
Patient & Prescribing Data
Switching to intravenous argatroban resulted in prompt therapeutic APTT attainment, leading to improved clinical outcomes.
Clinical Best Practices
- Educate healthcare providers on the atypical presentations of HIT, emphasizing the need for vigilance in cases of unexplained heparin resistance.
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