title: [Circulatory breathing abnormality: Clinical observation on exercise induced oscillatory breathing pattern].
abstract: OBJECTIVE
  Exercise induced oscillatory ventilation (EIOB) during cardiopulmonary exercise testing (CPET) is associated with severity and prognosis of disease, but clinical approach for the character of EIOB due to circulatory dysfunction are seldom reported.
  
  
  METHODS
  This retrospective analysis of symptom-limited maximum CPET data with an increment of 10-20 W/min in 38 patients with CHF. We calculated the duration, frequency, amplitude and other parameters of EIOB.
  
  
  RESULTS
  There were 31 presenting with EIOB (82%) in all patients with CHF. In EIOB group, VE amplitude were (12.4 ± 4.4)L/min (accounting for 81% ± 30% of mean) and duration were (77.0 ± 20.0)s. The number of patients whose EIOB presenting at rest, exercise, recovery stage and the whole eriod were 24, 31, 4 and 4, respectively. Except VE, there were VO2, VCO2, RER and PETO2 presenting EIOB in all 31 patients; VE/VCO2, VO2/VE and breath frequency in 29 patients; PETCO2 in 26 patients; VT and VO2/HR in 25 patients; and HR in 2 patients.
  
  
  CONCLUSIONS
  EIOB may occur in any period of CPET, mostly in severe patient with CHF, and presenting in many variables. Due to it is resulted from the circulatory dysfunction, we should call it circulatory (cardiac) oscillatory breathing abnormality.
authors.forename: Xue-mei
authors.initials: XM
authors.lastname: Zhang
authors.forename: Xing-guo
authors.initials: XG
authors.lastname: Sun
authors.forename: P
authors.initials: P
authors.lastname: Agostoni
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Na
authors.initials: N
authors.lastname: Zhou
authors.forename: Xiao-yue
authors.initials: XY
authors.lastname: Tan
authors.forename: Gui-qing
authors.initials: GQ
authors.lastname: Song
authors.forename: Lei
authors.initials: L
authors.lastname: Gu
authors.forename: Ning-hua
authors.initials: NH
authors.lastname: Liu
mesh_terms: D005080:Exercise Test; D006333:Heart Failure / Q000503:physiopathology*; D006801:Humans; D010101:Oxygen Consumption; D012143:Respiratory Physiological Phenomena; D012189:Retrospective Studies