title: Intrapulmonary percussive ventilation in acute exacerbations of COPD patients with mild respiratory acidosis: a randomized controlled trial [ISRCTN17802078].
abstract: BACKGROUND
  We hypothesized that the use of intrapulmonary percussive ventilation (IPV), a technique designed to improve mucus clearance, could prove effective in avoiding further deterioration in patients with acute exacerbations of chronic obstructive pulmonary disease (COPD) with mild respiratory acidosis.
  
  
  METHODS
  The study was performed in a medical intensive care unit of a university hospital. Thirty-three patients with exacerbations of COPD with a respiratory frequency >or= 25/min, a PaCO2 > 45 Torr and 7.35 <or= pH <or= 7.38 were included in the study. Patients were randomly assigned to receive either standard treatment (control group) or standard treatment plus IPV (IPV group). The IPV group underwent two daily sessions of 30 minutes performed by a chest physiotherapist through a full face mask. The therapy was considered successful when both worsening of the exacerbation and a decrease in pH to under 7.35, which would have required non-invasive ventilation, were avoided.
  
  
  RESULTS
  Thirty minutes of IPV led to a significant decrease in respiratory rate, an increase in PaO2 and a decrease in PaCO2 (p < 0.05). Exacerbation worsened in 6 out of 17 patients in the control group versus 0 out of 16 in the IPV group (p < 0.05). The hospital stay was significantly shorter in the IPV group than in the control group (6.8 +/- 1.0 vs. 7.9 +/- 1.3 days, p < 0.05).
  
  
  CONCLUSIONS
  IPV is a safe technique and may prevent further deterioration in patients with acute exacerbations of COPD with mild respiratory acidosis.
authors.affiliation: Département de Réanimation Médicale, Hôpital Pellegrin-Tripode, Bordeaux, France. frederic.vargas@chu-bordeaux.fr
authors.forename: Frédéric
authors.initials: F
authors.lastname: Vargas
authors.forename: Hoang Nam
authors.initials: HN
authors.lastname: Bui
authors.forename: Alexandre
authors.initials: A
authors.lastname: Boyer
authors.forename: Louis Rachid
authors.initials: LR
authors.lastname: Salmi
authors.forename: Georges
authors.initials: G
authors.lastname: Gbikpi-Benissan
authors.forename: Hervé
authors.initials: H
authors.lastname: Guenard
authors.forename: Didier
authors.initials: D
authors.lastname: Gruson
authors.forename: Gilles
authors.initials: G
authors.lastname: Hilbert
mesh_terms: D000142:Acidosis, Respiratory / Q000097:blood / Q000209:etiology* / Q000628:therapy*; D000368:Aged; D001774:Blood Chemical Analysis; D006801:Humans; D007902:Length of Stay; D009093:Mucus; D010102:Oxygen Inhalation Therapy; D010474:Percussion; D011446:Prospective Studies; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications* / Q000628:therapy*; D012121:Respiration, Artificial / Q000379:methods*; D015656:Respiratory Mechanics; D016896:Treatment Outcome