title: [Effects of noninvasive positive pressure ventilation on gas exchange and patients' transformation in chronic obstructive pulmonary disease and respiratory failure].
abstract: OBJECTIVE
  This paper was to observe the effects of noninvasive positive pressure ventilation (NPPV) on gas exchange and patients' transformation and to evaluate their clinical value.
  
  
  METHODS
  Patients were randomly treated by either NPPV, or conventional medicine. The arterial blood gas readings, heart rates (HR), and respiratory rates (HR) were obtained at admission after the treatment. It was necessary to intubate when the clinical deterioation was marked by PaCO2 > 70 mmHg, PaCO2 gradually increasing 5-10 mmHg, pH decreasing 0.05-0.1 or mental obstacle, or PaO2 < 45 mmHg.
  
  
  RESULTS
  NPPV significantly decreased the PaCO2 level, HR, and RR, significantly increased the PaO2 level, and also decreased the opportunity of intubation.
  
  
  CONCLUSIONS
  The results suggest that NPPV can improve the gas exchange and reduce the need of intubation in COPD patients with acute respiratory failure.
authors.affiliation: Department of Respiratory Medicine, Second Xiangya Hospital, Central South University, Changsha 410011, China.
authors.forename: R
authors.initials: R
authors.lastname: Zhou
authors.forename: P
authors.initials: P
authors.lastname: Chen
authors.forename: H
authors.initials: H
authors.lastname: Luo
authors.forename: X D
authors.initials: XD
authors.lastname: Xiang
mesh_terms: D000368:Aged; D001784:Blood Gas Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011175:Positive-Pressure Respiration; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology / Q000628:therapy*; D011659:Pulmonary Gas Exchange; D012131:Respiratory Insufficiency / Q000503:physiopathology / Q000628:therapy*