title: Systemic inflammation in patients with COPD and pulmonary hypertension.
abstract: OBJECTIVE
  COPD is a systemic disorder that is associated with increases of inflammatory proteins in systemic circulation. However, no data on the potential role of systemic inflammation in pulmonary hypertension secondary to COPD are available. Therefore, our aim was to investigate the degree of systemic inflammation reflected by circulatory levels of C-reactive protein (CRP), tumor-necrosis factor (TNF)-alpha, and interleukin (IL)-6 in COPD patients with and without pulmonary hypertension.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  University hospital, tertiary referral setting.
  
  
  METHODS
  In 43 consecutive patients with COPD (mean [+/- SD] age, 65.0 +/- 10.5 years; mean FEV(1), 46.2 +/- 18.1% predicted), lung function was assessed using body plethysmography; pulmonary artery pressure (Ppa) levels were measured by echocardiography. Serum TNF-alpha and IL-6 levels were assessed by enzyme-linked immunosorbent assay, and high-sensitivity serum CRP levels were measured by chemiluminescent immunoassay.
  
  
  RESULTS
  Pulmonary hypertension was present in 19 patients and was absent in 24 patients. In patients with pulmonary hypertension, serum CRP and TNF-alpha levels were significantly higher than in those patients without hypertension (median, 3.6 mg/L [25th to 75th percentile, 1.4 to 13.0 mg/L] vs 1.8 mg/L [25th to 75th percentile, 0.8 to 2.8 mg/L; p = 0.034]; and median, 4.2 pg/mL [25th to 75th percentile, 3.4 to 10.9 pg/mL] vs 3.1 pg/mL [25th to 75th percentile, 2.1 to 4.2 pg/mL]; p = 0.042, respectively). No differences were seen in serum IL-6 (median, 10.4 pg/mL [25th to 75th percentile, 8.8 to 12.2 pg/mL] vs 10.5 pg/mL [25th to 75th percentile, 9.4 to 39.1 pg/mL]; p = 0.651) between the groups. In multiple linear regression analysis, the following two variables were independent predictors of systolic Ppa (R(2) = 0.373): Pao(2) (p = 0.011); and log-transformed serum CRP level (p = 0.044).
  
  
  CONCLUSIONS
  We conclude that increases in Ppa in patients with COPD are associated with higher serum levels of CRP and TNF-alpha, raising the possibility of a pathogenetic role for low-grade systemic inflammation in the pathogenesis of pulmonary hypertension in COPD patients.
authors.affiliation: Department of Respiratory Medicine, Faculty of Medicine and L. Pasteur Teaching Hospital, Slovakia.
authors.forename: Pavol
authors.initials: P
authors.lastname: Joppa
authors.forename: Darina
authors.initials: D
authors.lastname: Petrasova
authors.forename: Branislav
authors.initials: B
authors.lastname: Stancak
authors.forename: Ruzena
authors.initials: R
authors.lastname: Tkacova
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D001794:Blood Pressure / Q000502:physiology; D002097:C-Reactive Protein / Q000378:metabolism*; D003430:Cross-Sectional Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D006976:Hypertension, Pulmonary / Q000097:blood / Q000209:etiology* / Q000503:physiopathology; D007249:Inflammation / Q000097:blood; D015850:Interleukin-6 / Q000097:blood*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood / Q000150:complications* / Q000503:physiopathology; D012720:Severity of Illness Index; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
chemical_list: D015415:Biomarkers; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D002097:C-Reactive Protein