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Table 2 Study I*: blood gas analyses and vital parameters after exercise (N = 38)

From: Portable NIV for patients with moderate to severe COPD: two randomized crossover trials

Study I*

Period

With pNIV

Without pNIV

Treatment effect (95% CI)

P

pH

1

7.42 ± 0.04

7.4 ± 0.05

− 0.005 [− 0.01; 0.004]

0.26

 

2

7.39 ± 0.05

7.42 ± 0.04

  

PaCO2 [mmHg]

1

42.7 ± 9.1

41.4 ± 6.1

0.46 [− 0.8; 1.7]

0.48

 

2

42.3 ± 5.9

43.2 ± 8.4

  

PaO2 [mmHg]

1

66.7 ± 7.4

61.1 ± 8.9

0.03 [− 1.9; 2]

0.98

 

2

58.5 ± 8.4

63.4 ± 8.3

  

HCO3 [mmol/l]

1

26.4 ± 2.4

24.8 ± 2

− 0.2 [− 0.7; 0.3]

0.45

 

2

24.7 ± 2.7

26.6 ± 2.3

  

SaO2 [%]

1

93.6 ± 2

90.8 ± 5.3

− 0.2 [− 1.4; 0.8]

0.63

 

2

89.6 ± 5

92.9 ± 2.6

  

RRsys [mmHg]

1

151.6 ± 28.1

147.8 ± 20.6

1.9 [− 5; 8.7]

0.659

 

2

152.2 ± 15.5

150.2 ± 21.6

  

RRdia [mmHg]

1

92.5 ± 16.6

91.2 ± 12.8

− 0.8 [− 6.4; 4.7]

0.77

 

2

94.4 ± 19.5

92.9 ± 11.5

  

Heart rate [/min]

1

85.5 ± 23.2

89.1 ± 14.4

0.4 [− 6.4; 7.2]

0.90

 

2

90.6 ± 12.9

88 ± 14.5

  
  1. PaO2 partial pressure of arterialized oxygen, PaCO2 partial pressure of arterialized carbon dioxide, HCO3 arterialized standard hydrogen carbonate, SaO2 Oxygen saturation, RRsys systolic blood pressure, RRdia diastolic blood pressure
  2. *Patients without long-term NIV