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

Table 4 Changes in SpO_2trachea and SvO_2blood in hemorrhagic shock status

Time	n	Oxygen saturation (%)
		SpO_2trachea	SvO_2blood
Pre-shock period	20	74.6 ± 4.5 (62–78)	74.3 ± 4.7 (62.6–76.8)
Immediately after onset of shock	20	74.2 ± 4.3 (60–78)	74.8 ± 4.6 (61.9–77.2)
15 min after shock	20	61.2 ± 4.8 (52–67)	61.7 ± 4.3 (52.4–68.2)
30 min after shock	20	42.2 ± 4.6 (41–54)	42.8 ± 4.7 (41.3–55.9)
15 min after resuscitation	20	51.8 ± 4.6 (49–63)	51.3 ± 4.4 (49.5–62.6)
30 min after resuscitation	20	64.5 ± 6.8 (57–77)	64.2 ± 6.3 (57.9–77.2)
60 min after resuscitation	20	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.

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