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Aspirin-induced asthma, also termed Samter's triad, Samter's syndrome, aspirin-exacerbated respiratory disease (AERD), and recently by an appointed task force of the European Academy of Allergy and Clinical Immunology/World Allergy Organization (EAACI/WAO) Nonsteroidal anti-inflammatory drugs-exacerbated respiratory disease (N-ERD). is a medical condition initially defined as consisting of three key features: asthma, respiratory symptoms exacerbated by aspirin, and nasal/ethmoidal polyposis; however, the syndrome's symptoms are exacerbated by a large variety of other nonsteroidal anti-inflammatory drugss (NSAIDs) besides aspirin. The symptoms of respiratory reactions in this syndrome are hypersensitivity reactions to NSAIDs rather than the typically described true allergic reactions that trigger other common allergen-induced asthma, rhinitis, or hives. The NSAID-induced reactions do not appear to involve the common mediators of true allergic reactions, immunoglobulin E or T cells. Rather, AERD is a type of NSAID-induced hypersensitivity syndrome. EAACI/WHO classifies the syndrome as one of 5 types of NSAID hypersensitivity or NSAID hypersensitivity reactions.
Signs and symptoms
The various non-allergic NSAID hypersensitivity syndromes affect 0.5–1.9% of the general population, with AERD affecting about 7% of all asthmatics and about 14% of patients with severe asthma.  AERD, which is more prevalent in women, usually begins in young adulthood (twenties and thirties are the most common onset times although children are afflicted with it and present a diagnostic problem in pediatrics) and may not include any other allergies. Most commonly the first symptom is rhinitis (inflammation or irritation of the nasal mucosa), which can manifest as sneezing, runny nose, or congestion. The disorder typically progresses to asthma, then nasal polyposis, with aspirin sensitivity coming last. Anosmia (lack of smell) is also common, as inflammation within the nose and sinuses likely reaches the olfactory receptors.
The respiratory reactions to aspirin vary in severity, ranging from mild nasal congestion and eye watering to lower respiratory symptoms including wheezing, coughing, an asthma attack, and in rare cases, anaphylaxis. In addition to the typical respiratory reactions, about 10% of patients with AERD manifest skin symptoms like urticaria and/or gastrointestinal symptoms such as abdominal pain or vomiting during their reactions to aspirin. In addition to aspirin, patients usually also react to other NSAIDs such as ibuprofen, and to any medication that inhibits the cyclooxygenase-1 (COX-1) enzyme, although paracetamol (acetaminophen) in low doses is generally considered safe. NSAID that are highly selective in blocking COX-2 and do not block its closely related paralog, COX-1, such as the COX-2 inhibitors celecoxib and rofecoxib, are also regarded as safe. Nonetheless, recent studies do find that these types of drugs, e.g. acetaminophen and celecoxib, may trigger adverse reactions in these patients; caution is recommended in using any COX inhibitors. In addition to aspirin and NSAIDs, consumption of even small amounts of alcohol also produces uncomfortable respiratory reactions in many patients.
The disorder is thought to be caused by an anomaly in the arachidonic acid metabolizing cascade which leads to increased production of pro-inflammatory cysteinyl leukotrienes, a series of chemicals involved in the body's inflammatory response. When medications like NSAIDs or aspirin block the COX-1 enzyme, production of thromboxane and some anti-inflammatory prostaglandins is decreased, and in patients with aspirin-induced asthma this results in the overproduction of pro-inflammatory leukotrienes to causes severe exacerbations of asthma and allergy-like symptoms. The underlying cause of the disorder is not fully understood, but there have been several important findings:
- Abnormally low levels of prostaglandin E2 (PGE2), which is protective for the lungs, has been found in patients with aspirin-induced asthma and may worsen their lung inflammation.
- In addition to the overproduction of cystinyl leukotrienes, overproduction of 15-lipoxygenase-derived arachidonic acid metabolites viz., 15-hydroxyicosatetraenoic acid and eoxins by the eosinophils isolated from the blood of individuals with AERD; certain of these products may help promote the inflammatory response.
- Overexpression of both the cysteinyl leukotriene receptor 1 and the leukotriene C4 synthase enzyme has been shown in respiratory tissue from patients with aspirin-induced asthma, which likely relates to the increased response to leukotrienes and increased production of leukotrienes seen in the disorder.
- The attachment of platelets to certain leukocytes in the blood of patients with aspirin-sensitive asthma has also been shown to contribute to the overproduction of leukotrienes.
- There may be a relationship between aspirin-induced asthma and TBX21, PTGER2, and LTC4S.
- Eosinophils isolated from the blood of aspirin-induced asthma subjects (as well as severe asthmatic patients) greatly overproduce 15-hydroxyicosatetraenoic acid and eoxin C4 when challenged with arachidonic acid or calcium ionophore A23187, compared to the eosinophils taken from normal or mildly asthmatic subjects; aspirin treatment of eosinophils from aspirin intolerant subjects causes the cells to mount a further increase in eoxin production. These results suggest that 15-lipoxygenase and certain of its metabolites, perhaps eoxin C4, as contributing to aspirin-induced asthma in a fashion similar to 5-lipoxygenase and its leukotriene metabolites.
Urinary cystyl-leukotriene or urinary LTE4 can be used after a supervised challenge with aspirin. In aspirin sensitivity, no change in N-methylhistamine is observed; while LTE4 levels are increased. This test however lacks sensitivity and has a 25 percent false negative rate among affected persons.
The preferred treatment for many patients is desensitization to aspirin, undertaken at a clinic or hospital specializing in such treatment. In the United States, the Scripps Clinic in San Diego, CA, the Massachusetts General Hospital in Boston, MA, the Brigham and Women's Hospital in Boston, MA, National Jewish Hospital in Denver  and Stanford University Adult ENT Clinic have allergists who routinely perform aspirin desensitization procedures for patients with aspirin-induced asthma. Patients who are desensitized then take a maintenance dose of aspirin daily and while on daily aspirin they often have reduced need for supporting medications, fewer asthma and sinusitis symptoms than previously, and many have an improved sense of smell. Desensitization to aspirin reduces the chance of nasal polyp recurrence, and can slow the regrowth of nasal polyps. Even patients desensitized to aspirin may continue to need other medications including nasal steroids, inhaled steroids, and leukotriene antagonists.
Leukotriene antagonists and inhibitors (montelukast, zafirlukast, and zileuton) are often helpful in treating the symptoms of aspirin-induced asthma. Some patients require oral steroids to alleviate asthma and congestion, and most patients will have recurring or chronic sinusitis due to the nasal inflammation.
Often surgery is required to remove nasal polyps, although they typically recur, particularly if aspirin desensitization is not undertaken. 90% of patients have been shown to have recurrence of nasal polyps within 5 years after surgery, with 47% requiring revision surgery in the same time period.
Some people have reported relief of symptoms by following a low-salicylate diet such as the Feingold diet. Aspirin is quickly converted in the body to salicylic acid, also known as 2-Hydroxybenzoic acid. Sommer et al. reported a multi-center prospective randomized cross-over trial with 30 patients following a low-salicylate diet for 6 weeks. This study demonstrated a clinically significant decrease in both subjective and objective scoring of severity of disease, but made note of the challenge for patients in following what is a fairly stringent diet.
A diet low in omega-6 oils (precursors of arachidonic acid), and high in omega-3 oils, may also help. In a small study, aspirin-sensitive asthma patients taking 10 grams of fish oil daily reported relief of most symptoms after six weeks, however symptoms returned if the supplement was stopped.
- Aspirin-induced asthma is also referred to as leukotriene associated hypersensitivity 
Samter's triad goes by several other names:
- Acetylsalicylic acid triad 
- Widal's triad
- Francis' triad
- Aspirin triad
- Aspirin-exacerbated respiratory disease (AERD).
- Aspirin-induced asthma and rhinitis (AIAR)
A sufferer who has not yet experienced asthma or aspirin sensitivity might be diagnosed as having:
- Non-allergic rhinitis
- Non-allergic rhinitis with eosinophilia syndrome (NARES)
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