Diagnostic challenge and desensitization protocols for NSAID reactions
- Ronald A Simon, MD
Ronald A Simon, MD
- Adjunct Professor, Department of Molecular and Experimental Medicine
- Scripps Research Institute, La Jolla, CA
Nonsteroidal anti-inflammatory drugs (NSAIDs), including aspirin, can cause several distinct types of allergic and pseudoallergic reactions. These reactions are categorized by the presumed underlying mechanism and whether the reaction is elicited by multiple NSAIDs or by a single agent. Challenge procedures are used in the diagnosis of some NSAID reactions, and desensitization protocols are used in management of patients who require NSAID therapy despite a history of adverse reactions.
The various challenge and desensitization protocols used by allergy specialists will be reviewed here. The clinical features of NSAID reactions and the use of alternative medications, either medications that are highly selective inhibitors of the enzyme cyclooxygenase-2 (COX-2) (eg, celecoxib, others) or NSAIDs that weakly inhibit cyclooxygenase-1 (COX-1), are presented elsewhere. (See "NSAIDs (including aspirin): Allergic and pseudoallergic reactions".)
To determine if a diagnostic challenge and/or desensitization is appropriate for a patient with a history of NSAID reaction, the clinician must first attempt to classify the patient's past reaction. This is done by reviewing the clinical history in detail. The most important elements of the history are:
●The signs and symptoms of the reaction
●Whether the reaction has been elicited by a single NSAID or multiple NSAIDsTo continue reading this article, you must log in with your personal, hospital, or group practice subscription. For more information on subscription options, click below on the option that best describes you:
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- The Scripps Clinic, San Diego, California. Dr. Simon may be reached at firstname.lastname@example.org.
- White AA, Stevenson DD, Woessner KM, Simon RA. Approach to patients with aspirin hypersensitivity and acute cardiovascular emergencies. Allergy Asthma Proc 2013; 34:138.
- Simon RA, Scripps Clinic, personal communication.
- Rossini R, Iorio A, Pozzi R, et al. Aspirin Desensitization in Patients With Coronary Artery Disease: Results of the Multicenter ADAPTED Registry (Aspirin Desensitization in Patients With Coronary Artery Disease). Circ Cardiovasc Interv 2017; 10.
- REACTION TYPES
- GENERAL ISSUES IN NSAID CHALLENGE AND DESENSITIZATION
- Indications for challenge
- Indication for desensitization
- Safety issues
- PROTOCOLS FOR ORAL CHALLENGES
- Choice of NSAID
- Use of placebo doses
- APPROACH TO SPECIFIC TYPES OF REACTIONS
- Respiratory reactions
- - Type 1 (respiratory reactions to multiple NSAIDs)
- - Type 4 (respiratory and cutaneous symptoms to multiple NSAIDs)
- - Type 6 (anaphylaxis to a single NSAID)
- Urticaria/angioedema reactions
- - Type 2 (patients with chronic urticaria)
- - Type 3 (patients without chronic urticaria)
- - Type 5 (patients without chronic urticaria)
- URGENT ASPIRIN DESENSITIZATION AFTER CARDIAC PROCEDURES
- Our approach
- SOCIETY GUIDELINE LINKS
- SUMMARY AND RECOMMENDATIONS