title: C-reactive protein measurement in general practice may lead to lower antibiotic prescribing for sinusitis.
abstract: BACKGROUND
  Symptoms of bacterial sinusitis overlap with viral sinusitis, and it is difficult to distinguish between the two conditions based only on a clinical examination. Uncertain diagnosis results in the significant overuse of antibiotics, which is considered to be one of the most important reasons for development of bacterial resistance to antibiotics. A raised C-reactive protein (CRP) level is an indicator of bacterial infection and the CRP rapid test has been shown to be useful for the diagnosis of bacterial sinusitis in general practice.
  
  
  OBJECTIVE
  To examine whether general practitioners (GPs) who use the CRP rapid test in their practice have a lower antibiotic prescribing rate for sinusitis than GPs who do not use the test.
  
  
  METHODS
  Observational design.
  
  
  METHODS
  General practice in Denmark.
  
  
  METHODS
  A group of GPs registered all contacts (n = 17 792) with patients who had respiratory tract infections during a 3-week period between 1 November 2001 and 31 January 2002. GPs who used a CRP rapid test were compared with GPs who did not, and the treatment of their patients (n = 1444) with suspected sinusitis was compared.
  
  
  RESULTS
  A CRP rapid test was used by 77% (n = 281) of the GPs. In the group of GPs using a CRP rapid test, the rate of antibiotic prescribing was 59% (95% confidence interval [CI] = 56 to 62) compared with 78% (95% CI = 73 to 82) in the group of GPs who did not use a CRP test. Performing a CRP rapid test was the factor that exerted the greatest influence on whether the patients were prescribed antibiotics, and the level of CRP had a strong influence on the prescribing rate.
  
  
  CONCLUSIONS
  The CRP rapid test has a substantial influence on the treatment of sinusitis, and implementing the test in general practice may lead to a reduction in antibiotic prescribing to patients with sinusitis.
authors.affiliation: Research Unit of General Practice, University of Southern Denmark, Denmark. lbjerrum@health.sdu.hk
authors.forename: Lars
authors.initials: L
authors.lastname: Bjerrum
authors.forename: Bente
authors.initials: B
authors.lastname: Gahrn-Hansen
authors.forename: Anders P
authors.initials: AP
authors.lastname: Munck
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001424:Bacterial Infections / Q000175:diagnosis*; D002097:C-Reactive Protein / Q000032:analysis*; D011307:Drug Prescriptions; D004363:Drug Utilization; D005194:Family Practice; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010818:Practice Patterns, Physicians'; D011446:Prospective Studies; D012044:Regression Analysis; D012141:Respiratory Tract Infections / Q000175:diagnosis*; D012852:Sinusitis / Q000188:drug therapy*
chemical_list: D000900:Anti-Bacterial Agents; D002097:C-Reactive Protein