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Table 2 Oxygen saturation measurements in physiological states

From: A preliminary study on the monitoring of mixed venous oxygen saturation through the left main bronchus

Intracuff pressure (cmH2O) n Oxygen saturation (%)
   SpO2trachea SvO2blood
0 20 70.2 ± 6.2 (57–76) 74.4 ± 4.3 (62.6–76.4)
10 20 74.2 ± 4.7 (62–77) 74.4 ± 4.4 (62.5–76.9)
20 20 74.2 ± 4.8 (62–77) 74.3 ± 4.3 (62.4–76.7)
40 20 74.2 ± 4.6 (61–76) 74.4 ± 4.3 (62.3–76.9)
60 20 74.2 ± 4.6 (62–77) 74.3 ± 4.4 (62.5–77.1)
Overall 100 72.5 ± 6.8 (57–77) 74.4 ± 6.3 (61.9–77.2)
Overall excluding 0 cmH2O 80 74.2 ± 4.2 (61–77) 74.4 ± 4.3 (61.2–77.6)
  1. Values are means ± SEM (range). SpO2trachea, mixed venous oxygen saturation measured through the left main bronchus; SvO2blood, oxygen saturation from pulmonary artery samples.