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Table 1 Polysomnography data for before nasal high-flow therapy system and nasal high-flow therapy system

From: Nasal high-flow oxygen therapy system for improving sleep-related hypoventilation in chronic obstructive pulmonary disease: a case report

 

Before NHFOTS

NHFOTS

AHI (events/h)

12.1

3.7

AI (events/h)

0.26

0.0

HI (events/h)

11.9

3.7

Mean SpO2 (%)

89

93.0

Minimum SpO2 (%)

63

79

CT90 (%)

30.8

2.5

Sleep Stage 1 (min)

109.5

65.0

Sleep Stage 2 (min)

210.5

268.0

Sleep Stage 3 (min)

68.0

84.0

Sleep Stage 4 (min)

0.0

38.5

Sleep Stage REM (min)

72.0

85.5

  1. NHFOTS: nasal high-flow therapy system.
  2. AHI: apnea-hypopnea index.
  3. AI: apnea index.
  4. HI: hypopnea index.
  5. SpO2: Oxygen Saturation of Arterial Blood Measured by Pulse Oximeter.
  6. CT90: cumulative time percentage with SpO2 <90%.
  7. REM: Rapid eye movement.