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Table 2 Polysomnographic report: patients with and without CPAP treatment

From: Nocturnal CPAP improves walking capacity in COPD patients with obstructive sleep apnoea

 

Overlap syndrome

 

COPD

  

n = 22

 

n = 22

 

Baseline

With CPAP

P

Baseline

With CPAP

P

†P

Total sleep time (minutes)

294.3 ± 80.5

290.1 ± 94.9

0.758

287.8 ± 77.9

273.2 ± 71.7

0.408

0.760

Sleep efficiency (%)

67.2 ± 12.8

68.6 ± 14.3

0.833

66.3 ± 14.2

65.2 ± 12.9

0.650

0.699

AHI event. h-1

39.2 ± 16.5

4.6 ± 2.9

0.001

7.5 ± 4.1*

1.6 ± 1.4

0.001

0.001

ODI event. h-1

20.4 ± 16.2

3.1 ± 2.9

0.001

3.1 ± 2.2*

0.9 ± 1.1

0.001

0.001

Average SaO2%

93.3 ± 2.2

94.5 ± 1.7

0.011

93.8 ± 2.0

94.9 ± 2.1

0.001

0.866

Lowest SaO2%

80.3 ± 8.8

89.3 ± 3.9

0.001

87.0 ± 4.6*

90.2 ± 4.3

0.005

0.089

Wake%

26.6 ± 10.3

21.8 ± 13.7

0.211

25.5 ± 14.2

26.9 ± 12.7

0.578

0.124

N1%

23.0 ± 14.0

15.4 ± 8.9

0.010

20.3 ± 14.1

16.5 ± 8.7

0.079

0.296

N2%

39.5 ± 12.6

41.2 ± 14.9

0.700

34.0 ± 11.8

33.2 ± 11.6

0.941

0.751

N3%

2.3 ± 3.9

5.2 ± 6.1

0.001

7.5 ± 9.4

9.2 ± 11.4

0.235

0.191

REM%

8.5 ± 7.1

16.4 ± 10.3

0.004

12.2 ± 7.7

13.9 ± 7.5

0.144

0.026

CPAP pressure (cm H2O)

 

6.8 ± 1.8

  

4.9 ± 0.9*

  
  1. *P < 0.05; when compared with baseline overlap syndrome group.
  2. P values represent comparisons between baseline and with CPAP in each corresponding group.
  3. †P values represent comparisons with regards to the changes with CPAP treatment between overlap syndrome and COPD in each corresponding group.
  4. AHI apnoea/hypopnea index, ODI oxygen desaturation index, SWS slow wave sleep, REM rapid eye movement, CPAP continuous positive airway pressure.