. 2005 Dec 6;10(1):R7. doi: 10.1186/cc3914

Table 2.

Oxygen saturation measurements in physiological states

Intracuff pressure (cmH₂O)	n	Oxygen saturation (%)

		SpO_2trachea	SvO_2blood
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)

Values are means ± SEM (range). SpO_2trachea, mixed venous oxygen saturation measured through the left main bronchus; SvO_2blood, oxygen saturation from pulmonary artery samples.