Effects of Various F1O2 on Central and Mixed Venous Oxygen Saturation during Mechanical Ventilation / 대한마취과학회지

ABSTRACT

BACKGROUND: It is invasive and accompanies various risks to insert pulmonary artery catheter in order to measure mixed venous oxygen saturation (SvO2) that is associated with patients clinical course and prognosis. If there is relationship between central venous oxygen saturation (ScvO2) and mixed venous oxygen saturation, we can use the central venous oxygen saturation instead of mixed venous oxygen saturation to monitor and treat patients. METHODS: We inserted the Swan-Ganz catheter in 20 patients (male 8, female l2) scheduled for undergoing open heart surgery and accomplished the blood gas analysis of the radial arterial blood, central venous blood and mixed venous blood during postoperative respiratory care in intensive care unit at F1O2 1.0, 0.6 and 0.4 in order. RESULTS: There was no significant difference between central venous blood and mixed venous blood in respect to pH, PCO2, PO2. except the mixed venous blood pH at F1O2 0.6 that is greater than the central venous blood pH at F1O2 0.6. Central venous oxygen saturation and mixed venous saturation were not significantly different and showed the following close relationship SvO2(%)=15.41+0.80XScvO2 (R=0.88, p<0.05). In respect to the difference according to the variation of F1O2, the SO2 and PO2 at F1O2. 1.0 were higher than the SO2 and PO2 at F1O2 0.6 and 0.4, but the differnce between F1O2 0.6 and 0.4 was not significant. CONCLUSIONS: We might conclude that central venous oxygen saturation might be replaced for the mixed venous oxygen saturation in respiratory care after open heart surgery in adults.