title: Cefazolin use in patients who report a non-IgE mediated penicillin allergy: a retrospective look at adverse reactions in arthroplasty.
abstract: BACKGROUND
  A large number of patients presenting for total hip and knee arthroplasty report an allergy to penicillin. the reported incidence of cross reactions with cephalosporins in patients with penicillin allergy ranges from 3% to 18%. Perioperative antibiotic prophylaxis practices range from using cephalosporins to substituting clindamycin or vancomycin. the purpose of this study was to determine whether cefazolin can be used safely in the perioperative setting in patients with reported non-IgE mediated reactions to penicillin.
  
  
  METHODS
  We retrospectively reviewed all primary total hip and knee arthroplasty (2012) and revision (278) cases done at a canadian university hospital from 2007 to 2010. We calculated the prevalence of reported penicillin allergy, the specific reaction reported, and the observed reaction rate in penicillin allergic patients given cefazolin.
  
  
  RESULTS
  The prevalence of reported penicillin allergy was 9.9%. there was a wide range of reported reactions, with 25% IgE mediated and 75% non-IgE mediated. Only 27% of patients reporting penicillin allergies were given cefazolin. there were no adverse reactions when non-IgE mediated penicillin allergy patients received cefazolin.
  
  
  CONCLUSIONS
  surgical patients with reported non-IgE allergic reactions to penicillin have a low chance of adverse reaction to perioperative administration of cefazolin. Only a fraction of surgical patients with reported non-IgE mediated reactions to penicillin receive cefazolin perioperatively.
authors.affiliation: Department of Surgery, Queen's University. sghaslam@gmail.com
authors.forename: S
authors.initials: S
authors.lastname: Haslam
authors.forename: D
authors.initials: D
authors.lastname: Yen
authors.forename: N
authors.initials: N
authors.lastname: Dvirnik
authors.forename: D
authors.initials: D
authors.lastname: Engen
mesh_terms: D000900:Anti-Bacterial Agents / Q000009:adverse effects*; D019643:Arthroplasty, Replacement; D002437:Cefazolin / Q000009:adverse effects*; D003429:Cross Reactions; D004342:Drug Hypersensitivity / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D010406:Penicillins / Q000009:adverse effects*; D012189:Retrospective Studies
chemical_list: D000900:Anti-Bacterial Agents; D010406:Penicillins; D002437:Cefazolin