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

Table 5 Between-method statistical comparisons for oxygen saturation measurements in hemorrhagic shock status (SpO_2trachea versus SvO_2blood)

Time	n	MD (%)	SD	SEM	LOA	SEL
Pre-shock period	20	-0.845	3.065	0.685	-6.975 to 5.285	1.187
Immediately after onset of shock	20	0.495	3.014	0.674	-5.533 to 6.523	1.167
15 min after shock	20	-0.165	3.210	0.718	-6.585 to 6.255	1.243
30 min after shock	20	-1.275	2.759	0.617	-6.793 to 4.243	1.069
15 min after resuscitation	20	-0.315	1.509	0.3374	-3.333 to 2.703	0.584
30 min after resuscitation	20	0.460	2.463	0.551	-4.466 to 5.386	0.954
60 min after resuscitation	20	1.865	2.844	0.636	-3.823 to 7.553	1.101

LOA, limits of agreement (MD ± 1.96SD); MD, mean difference; SD, standard deviation of the difference; SEL, standard error of limit; SEM, standard error of the mean difference; SpO_2trachea, mixed venous oxygen saturation measured through the left main bronchus; SvO_2blood, oxygen saturation from pulmonary artery samples.

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