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Heparin-Induced Thrombocytopenia

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Abstract

Heparin-induced thrombocytopenia (HIT) is an uncommon condition with grave consequences. It is a clinicopathological diagnosis which can often be complex. However, delayed diagnosis and inadequate or inappropriate treatment can lead to life- and limb-threatening outcomes. This chapter will describe the syndrome of HIT (and HITT—heparin-induced thrombocytopenia with thrombosis) as it is now known, including its history, pathophysiology, diagnostic process with the current testing paradigm, and updated treatment options for HIT.

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Abbreviations

ACCP:

American College of Chest Physicians

ACT:

Activated clotting time

CFX:

Chromogenic factor X

CPB:

Cardiopulmonary bypass

DOAC:

Direct oral anticoagulants

DTI:

Direct thrombin inhibitor

DVT:

Deep vein thrombosis

ELISA:

Enzyme-linked immunosorbent assay

HAT:

Heparin-associated thrombocytopenia

HEP:

HIT Expert Probability

HIT:

Heparin-induced thrombocytopenia

INR:

International normalized ratio

IVC:

Inferior vena cava

LMWH:

Low-molecular-weight heparin

O.D.:

Optical density

PaGIA:

Particle gel immunoassay

PCI:

Percutaneous coronary intervention

PE:

Pulmonary embolism

PF4:

Platelet factor 4

SRA:

Serotonin release assay

VKA:

Vitamin K antagonist

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Downs, E., Goldman, S., Palkimas, S., Sharma, A.M. (2018). Heparin-Induced Thrombocytopenia. In: Lau, J., Barnes, G., Streiff, M. (eds) Anticoagulation Therapy . Springer, Cham. https://doi.org/10.1007/978-3-319-73709-6_17

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