title: [Safety of reintroducing platelet-inhibitory doses of aspirin in patients with urticaria or angioedema induced by anti-inflammatory doses].
abstract: BACKGROUND
  Aspirin is one of the most widely prescribed drugs in the world on account of its analgesic, antipyretic, and anti-inflammatory properties. Its effect on platelet aggregation makes it the first choice for prophylaxis in cardiovascular, neurological and obstetric diseases. However, a history of aspirin-induced urticaria and/or angioedema is usually a contraindication for further prescription of the drug. The aim of this article was to demonstrate that patients presenting aspirin-induced cutaneous reactions at anti-inflammatory doses can safely benefit from aspirin reintroduction at platelet-inhibitory doses.
  
  
  METHODS
  Patients with a history of aspirin-induced urticaria and/or angioedema referred to our department between January 2000 and June 2008 for double-blind placebo-controlled reintroduction at platelet-inhibitory doses for a medical indication were enrolled in this study.
  
  
  RESULTS
  Seventy patients with aspirin hypersensitivity as well as a medical indication for this therapy were referred to our department. Of these, 38 (54.3%) had a history of aspirin-induced urticaria and/or angioedema, including three laryngeal oedemas (7.9%). All subjects received platelet-inhibitory doses of aspirin (maximal total dose: 400mg/day) in double-blind placebo-controlled fashion during a one-day hospitalization period. None of the patients presented an immediate hypersensitivity reaction. Only one patient, who had received a cumulative dose of 200mg/day, reported diffuse urticaria and facial angioedema of no clinical significance the following day. He had a history of chronic urticaria.
  
  
  CONCLUSIONS
  This article demonstrates the safety of reintroducing platelet-inhibitory doses of aspirin in patients in whom it is indicated and reporting aspirin-induced urticaria and/or angioedema with anti-inflammatory doses. However, patients with a history of chronic urticaria should undergo a challenge with the lowest platelet-inhibitory dose (75mg/day) in order to minimize the risk of aggravating their condition.
authors.affiliation: Service de dermatologie et allergologie, hôpital Tenon, 4, rue de la Chine, 75020 Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Vial
authors.forename: P
authors.initials: P
authors.lastname: Mathelier-Fusade
authors.forename: H
authors.initials: H
authors.lastname: Gaouar
authors.forename: F
authors.initials: F
authors.lastname: Leynadier
authors.forename: O
authors.initials: O
authors.lastname: Chosidow
authors.forename: S
authors.initials: S
authors.lastname: Aractingi
authors.forename: C
authors.initials: C
authors.lastname: Francès
mesh_terms: D000799:Angioedema / Q000139:chemically induced; D001241:Aspirin / Q000008:administration & dosage* / Q000009:adverse effects*; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage* / Q000009:adverse effects*; D014581:Urticaria / Q000139:chemically induced
chemical_list: D010975:Platelet Aggregation Inhibitors; D001241:Aspirin