Table 4.

Polysomnography parameters and arterial blood gas analysis as measures of hypoxia in patients with SDB.

Study	Mean SpO2 (%)			Minimal SpO2 (%)			ODI (≥3%)			PaO2 and PaCO2 (mm Hg)*
	Pain:Opioids	Pain:No Opioids	No Pain:No Opioids	Pain:Opioids	Pain:No Opioids	No Pain:No Opioids	Pain:Opioids	Pain:No Opioids	No Pain:No Opioids	Pain:Opioids	Pain:No Opioids	No Pain:No Opioids
Recruitment location: sleep clinics
Walker 2007	Awake: 91 ± 3,† NREM: 90 ± 3,† REM: 89 ± 7	―	Awake: 93 ± 2, NREM: 92 ± 2, REM: 91 ± 4	NR	―	NR	NR	―	NR	―	―	―
Farney 2008	90 ± 4	―	―	80 ± 8	―	―	31 ± 34	―	―	―	―	―
Farney 2008	NR	NR	NR	84 ± 6	83 ± 7	83 ± 7	20 ± 24	24 ± 27	25 ± 23	―	―	―
Jungquist 2012	94 ± 3	―	―	83 ± 8	―	―	NR	―	―	PaO2: 80; range, 59–99; PaCO2: range, 42–53	―	―
Recruitment location: pain clinics
Webster 2008	NR	―	―	NR	―	―	NR	―	―	―	―	―
Mogri 2009	NR	―	―	NR	―	―	NR	―	―	―	―	―
Rose 2014	Awake: 94 ± 1.6†	―	Awake: 97 ± 1.3	NR	―	―	NR	―	―	PaO2: 81.4 ± 9; range, 74–86; PaCO2: 44.8 ± 41; range: 42–47	―	―
Shapiro 2015	93 ± 3	―	―	80 ± 8	―	―	33 ± 29	―	―	―	―	―
Pampati 2016	NR	NR	―	NR	NR	―	NR	NR	―	―	―	―

Values are expressed as mean ± SD where appropriate. *Data obtained from arterial blood gas analysis. †P < .05 vs no pain:no opioids. NR = not reported, NREM = non–rapid eye movement, ODI = oxygen desaturation index, PaCO₂ = partial pressure of CO₂ in arterial blood, PaO₂ = partial pressure of O₂ in arterial blood, REM = rapid eye movement, SpO₂ = peripheral capillary O₂ saturation.