Aspirin desensitization

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Keri Shafer, M.D.

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Overview

Approximately 10% of patients will develop a hypersensitivity reaction to aspirin. Dual antiplatelet therapy with both aspirin and clopidogrel has been associated with improved clinical outcomes in the management of patients with acute coronary syndromes. Although there is a lack of supporting data, patients with aspirin hypersensitivity are sometimes managed with clopidogrel monotherapy. Aspirin desensitization is required when continued aspirin administration is essential (e.g. management of an acute coronary syndrome with stent placement). A rapid protocol can be used as described below. [1]. While this protocol can be implemented over the course of several hours, it may not applicable to those patients who must proceed to the cardiac catheterization laboratory such as the patient with ST segment elevation myocardial infarction where "time is muscle".

Diagnosis

Signs and Symptoms

The signs and symptoms of hypersensitivity include rhinorrhea, exacerbation of asthma, urticaria, angioedema, and anaphylaxis.

Mechanism of Aspirin Desensitization

The pathophysiology aspirin hypersensitivity involves both excess leukotriene producation as well as the development of antibodies directed toward aspirin. The goal of a desensitization protocol is to deplete the leukotrienes (as well as other mediators) and to down-regulate the leukotriene receptors.

Protocol for Aspirin Desensitization:

The dose of aspirin is increased every 15 minutes until the maximum dose of aspirin is administered:

Dose # 0 minutes: 0.1 mg 15 minutes: 0.3 mg 30 minutes: 1 mg 45 minutes: 3 mg 60 minutes: 10 mg 75 minutes: 20 mg 90 minutes: 40 mg 105 minutes: 81 mg 120 minutes: 162 mg 135 minutes: 325 mg

References

  1. Page NA, Schroeder WS (2007). "Rapid desensitization protocols for patients with cardiovascular disease and aspirin hypersensitivity in an era of dual antiplatelet therapy". The Annals of Pharmacotherapy. 41 (1): 61–7. doi:10.1345/aph.1H437. PMID 17200429. Retrieved 2010-07-01. Unknown parameter |month= ignored (help)

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