title: Failure to recover to baseline pulmonary function after cystic fibrosis pulmonary exacerbation.
abstract: BACKGROUND
  Patients with cystic fibrosis periodically experience pulmonary exacerbations. Previous studies have noted that some patients' lung function (FEV(1)) does not improve with treatment.
  
  
  OBJECTIVE
  To determine the proportion of patients treated for a pulmonary exacerbation that does not recover to spirometric baseline, and to identify factors associated with the failure to recover to spirometric baseline.
  
  
  METHODS
  Cohort study using the Cystic Fibrosis Foundation Patient Registry from 2003-2006. We randomly selected one pulmonary exacerbation treated with intravenous antibiotics per patient and compared the best FEV(1) in the 3 months after treatment with the best FEV(1) in the 6 months before treatment. Recovery to baseline was defined as any FEV(1) in the 3 months after treatment that was greater than or equal to 90% of the baseline FEV(1). Multivariable logistic regression was used to estimate associations with the failure to recover to baseline FEV(1).
  
  
  RESULTS
  Of 8,479 pulmonary exacerbations, 25% failed to recover to baseline FEV(1). A higher risk of failing to recover to baseline was associated with female sex; pancreatic insufficiency; being undernourished; Medicaid insurance; persistent infection with Pseudomonas aeruginosa, Burkholderia cepacia complex, or methicillin-resistant Staphylococcus aureus; allergic bronchopulmonary aspergillosis; a longer time since baseline spirometric assessment; and a larger drop in FEV(1) from baseline to treatment initiation.
  
  
  CONCLUSIONS
  For a randomly selected pulmonary exacerbation, 25% of patients' pulmonary function did not recover to baseline after treatment with intravenous antibiotics. We identified factors associated with the failure to recover to baseline, allowing clinicians to identify patients who may benefit from closer monitoring and more aggressive treatment.
authors.affiliation: Department of Pediatrics, American Family Children's Hospital, 600 Highland Avenue, Madison, WI 53792-9988, USA. dbsanders@pediatrics.wisc.edu
authors.forename: Don B
authors.initials: DB
authors.lastname: Sanders
authors.forename: Rachel C L
authors.initials: RC
authors.lastname: Bittner
authors.forename: Margaret
authors.initials: M
authors.lastname: Rosenfeld
authors.forename: Lucas R
authors.initials: LR
authors.lastname: Hoffman
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Redding
authors.forename: Christopher H
authors.initials: CH
authors.lastname: Goss
mesh_terms: D000293:Adolescent; D000328:Adult; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D002648:Child; D003550:Cystic Fibrosis / Q000188:drug therapy / Q000382:microbiology / Q000503:physiopathology*; D018450:Disease Progression; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D007262:Infusions, Intravenous; D016015:Logistic Models; D008297:Male; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D000900:Anti-Bacterial Agents
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