Diagnostic challenge and desensitization protocols for NSAID reactions
- Ronald A Simon, MD
Ronald A Simon, MD
- Head, Division of Allergy, Asthma, and Immunology
- Scripps Clinic, San Diego, CA
Nonsteroidal antiinflammatory 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 NSAIDs
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- White AA, Stevenson DD, Woessner KM, Simon RA. Approach to patients with aspirin hypersensitivity and acute cardiovascular emergencies. Allergy Asthma Proc 2013; 34:138.
- Gollapudi RR, Teirstein PS, Stevenson DD, Simon RA. Aspirin sensitivity: implications for patients with coronary artery disease. JAMA 2004; 292:3017.
- Hope AP, Woessner KA, Simon RA, Stevenson DD. Rational approach to aspirin dosing during oral challenges and desensitization of patients with aspirin-exacerbated respiratory disease. J Allergy Clin Immunol 2009; 123:406.
- The Scripps Clinic, San Diego, California. Dr. Simon may be reached at email@example.com.
- REACTION TYPES
- Aspirin desensitization following a procedure
- 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)
- SUMMARY AND RECOMMENDATIONS