# A Rare Case of Argatroban-Induced Anaphylaxis in a Patient With Intermediate-High Risk Pulmonary Embolism

## TL;DR

A patient with a serious blood clot developed an allergic reaction to argatroban, an alternative drug used when heparin causes low platelet counts.

## Contribution

Reports a rare case of anaphylaxis to argatroban in a patient with heparin-induced thrombocytopenia.

## Key findings

- The patient experienced anaphylaxis after switching to argatroban due to suspected heparin-induced thrombocytopenia.
- The case illustrates the diagnostic challenges in managing anticoagulation in patients with heparin-induced thrombocytopenia.

## Abstract

Heparin-induced thrombocytopenia is a rare and potentially devastating complication of heparin therapy. Patients with an absolute indication for anticoagulation, such as those with significant pulmonary embolism, must be switched to a different anticoagulant, such as argatroban, a direct thrombin inhibitor. We report a case of anaphylaxis to argatroban in a patient who was initially on heparin for intermediate-high risk pulmonary embolism but developed suspected type II heparin-induced thrombocytopenia. This case highlights the significance of recognizing and treating anaphylactic reactions and the diagnostic challenges associated with heparin-induced thrombocytopenia.