title: [Evidence of waveform information in arterial blood gas by beat-by-beat sampling method in patients with heart failure].
abstract: OBJECTIVE
  We investigate the magnitudes of waveform changes of arterial blood gas (ABG) in patients with heart failure.
  
  
  METHODS
  Five patients with heart failure were selected, continuous collecting radial artery blood and measured PaO2, PaCO2, pHa and Sao2. We selected two typical breaths cycles of waveform changes of ABG from each patient for data analysis. Comparison of the adjacent highest and lowest values to verify the presence of a periodic waveform changes of ABG, and in addition, we used t test to analysis the range of waveform changes of ABG in patients with heart failure and patients with normal cardiac function and compared whether the difference between them.
  
  
  RESULTS
  The 5 patients (2 surgical and 3 ICU) with heart failure, were 4 male and 1 female, (69 ± 7)year, (169 ± 10) cm, (75 ± 19)kg, LVEF = (38 ± 3)%. The heart beat numbers for full blood into the blood sampling pipe were 17 ± 2, and all covered more than 2 breath cycles. There were significant changes of PaO2, PaCO2, [H+]a and SaO2 (P < 0.05). The magnitudes of changing PaO2, PaCO2, [H+]a and Sao2 were (7.94 ± 2.02)mmHg, (1.18 ± 0.56)mmHg, (0.54 ± 0.17)nmol/L and (0.21 ± 0.07)%, and they were (6.1 ± 1.5)%, (3.2 ± 1.5)%, (1.5 ± 0.5)% and (0.2 ± 0.1)% from their mean respectively. Even these magnitudes fo all ABG parameters were trendily lower than those of patients with normal cardiac function, but only PaO2 and [H+]a were significant (P < 0.05).
  
  
  CONCLUSIONS
  Using this simple continuous beat-by-beat arterial blood sampling method, we obtained a clear evidence of periodic waveform of ABG parameters following by breath cycle in patients with heart failure, but the magnitude trendily be decreased.
authors.forename: You-xiu
authors.initials: YX
authors.lastname: Yao
authors.forename: Xing-guo
authors.initials: XG
authors.lastname: Sun
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Xiao-yue
authors.initials: XY
authors.lastname: Tan
authors.forename: Hong-liang
authors.initials: HL
authors.lastname: Zhang
authors.forename: Gu-yan
authors.initials: GY
authors.lastname: Wang
authors.forename: Wan-gang
authors.initials: WG
authors.lastname: Ge
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Zheng
authors.initials: Z
authors.lastname: Ci
authors.forename: Sheng-shou
authors.initials: SS
authors.lastname: Hu
mesh_terms: D000368:Aged; D001784:Blood Gas Analysis; D002318:Cardiovascular Diseases; D005260:Female; D006333:Heart Failure; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods*