title: Risk factors for hospital readmission in patients with chronic obstructive pulmonary disease.
abstract: BACKGROUND
  Hospital readmissions for acute exacerbation of chronic obstructive pulmonary disease (COPD) are one of the leading causes of health care expenditures worldwide.
  
  
  OBJECTIVE
  To identify risk factors for hospital readmission in COPD patients.
  
  
  METHODS
  We prospectively evaluated 129 consecutive patients hospitalized for acute exacerbation of COPD. Clinical, spirometric and arterial blood gas variables were measured during hospitalization. Socioeconomic characteristics, comorbidity, dyspnea, functional dependence, depression, social support and quality of life were also analyzed. Readmission was defined as one or more hospitalizations in the following year.
  
  
  RESULTS
  During the follow-up period, 75 (58.5%) patients were readmitted. In bivariate analysis, readmission was associated with previous hospitalization for COPD in the past year, dyspnea scale, PaCO(2) at discharge, depression, cor pulmonale, chronic domiciliary oxygen and quality of life measured by the St. George's Respiratory Questionnaire. In multivariate analysis, the best predictor of readmission was the combination of hospitalization for COPD in the previous year (odds ratio, OR: 4.27; 95% confidence interval, CI: 1.5-12), the total score of the St. George's Respiratory Questionnaire >or=50 points (OR: 2.36; 95% CI: 1.03-5.04) and PaCO(2) at discharge >or=45 mm Hg (OR: 2.18; 95% CI: 0.84-5.06). With this model, the probability of readmission for patients without any of these variables was 7%, while it was 70% for the patients with all three variables present.
  
  
  CONCLUSIONS
  The combination of quality of life, hospitalization for COPD in the previous year and hypercapnia at discharge are useful predictors of readmission at 1 year.
authors.affiliation: Department of Internal Medicine, Hospital Mútua de Terrassa, University of Barcelona, Barcelona, Spain. 19908pam@comb.es
authors.forename: Pedro
authors.initials: P
authors.lastname: Almagro
authors.forename: Bienvenido
authors.initials: B
authors.lastname: Barreiro
authors.forename: Anna
authors.initials: A
authors.lastname: Ochoa de Echaguen
authors.forename: Salvador
authors.initials: S
authors.lastname: Quintana
authors.forename: Mónica
authors.initials: M
authors.lastname: Rodríguez Carballeira
authors.forename: José L
authors.initials: JL
authors.lastname: Heredia
authors.forename: Javier
authors.initials: J
authors.lastname: Garau
mesh_terms: D000368:Aged; D016001:Confidence Intervals; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010359:Patient Readmission / Q000706:statistics & numerical data*; D011379:Prognosis; D011446:Prospective Studies; D029424:Pulmonary Disease, Chronic Obstructive / Q000453:epidemiology* / Q000503:physiopathology; D012008:Recurrence; D012044:Regression Analysis; D012307:Risk Factors; D012720:Severity of Illness Index; D013030:Spain / Q000453:epidemiology; D013147:Spirometry; D015996:Survival Rate / Q000639:trends