title: Comorbidities, patient knowledge, and disease management in a national sample of patients with COPD.
abstract: OBJECTIVE
  Chronic obstructive pulmonary disease (COPD) is the fourth leading cause of death in the United States but is often undertreated. COPD often overlaps with other conditions such as hypertension and osteoporosis, which are less morbid but may be treated more aggressively. We evaluated the prevalence of these comorbid conditions and compared testing, patient knowledge, and management in a national sample of patients with COPD.
  
  
  METHODS
  A survey was administered by telephone in 2006 to 1003 patients with COPD to evaluate the prevalence of comorbid conditions, diagnostic testing, knowledge, and management using standardized instruments. The completion rate was 87%.
  
  
  RESULTS
  Among 1003 patients with COPD, 61% reported moderate or severe dyspnea and 41% reported a prior hospitalization for COPD. The most prevalent comorbid diagnoses were hypertension (55%), hypercholesterolemia (52%), depression (37%), cataracts (31%), and osteoporosis (28%). Only 10% of respondents knew their forced expiratory volume in 1 second (95% confidence interval [CI], 8-12) compared with 79% who knew their blood pressure (95% CI, 76-83). Seventy-two percent (95% CI, 69-75) reported taking any medication for COPD, usually a short-acting bronchodilator, whereas 87% (95% CI, 84-90) of patients with COPD and hypertension were taking an antihypertensive medication and 72% (95% CI, 68-75) of patients with COPD and hypercholesterolemia were taking a statin.
  
  
  CONCLUSIONS
  Although most patients with COPD in this national sample were symptomatic and many had been hospitalized for COPD, COPD self-knowledge was low and COPD was undertreated compared with generally asymptomatic, less morbid conditions such as hypertension.
authors.affiliation: Division of General Medicine, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY, USA. rgb9@columbia.edu
authors.forename: R Graham
authors.initials: RG
authors.lastname: Barr
authors.forename: Bartolome R
authors.initials: BR
authors.lastname: Celli
authors.forename: David M
authors.initials: DM
authors.lastname: Mannino
authors.forename: Thomas
authors.initials: T
authors.lastname: Petty
authors.forename: Stephen I
authors.initials: SI
authors.lastname: Rennard
authors.forename: Frank C
authors.initials: FC
authors.lastname: Sciurba
authors.forename: James K
authors.initials: JK
authors.lastname: Stoller
authors.forename: Byron M
authors.initials: BM
authors.lastname: Thomashow
authors.forename: Gerard M
authors.initials: GM
authors.lastname: Turino