Abstract
Fourty-eight patients (ASA physical status I — I) undergoing selected thoracotomy and pulmonectomy were studied. They were divided into two groups according to different respiratory modes, two-lung ventilation (TLV) and onelung ventilation (OLV) or TLV and OLV with a Bain cyclic system for CPAP on the side of operated lung. PetCO2 and PaCO2 were measured after 30 min TLV, 30 min and 60 min OLV, and repeated TLV (R-TLV) 30 min after pulmonectomy, to evaluate the difference between PetCO2 and PaCO2 in OLV and to observe the effect of abating hypoxemia and discharge of CO2 in OLV with Bain system. Our results showed that the PaCO2 and PetCO2 in different test groups were normal though the measured values in OLV were slightly higher than that in TLV (P 0. 05). There was no significant difference between group 1. and 2. in OLV (P>0. 05). There was a close correlation between PetCO2 and PaCO2(P<0.05). The differences of the calculated P(a-et)CO2 and radio of PetCO2/ PaCO2 in different ventilation modes were not significant. Hypoxemia in OLV was corrected by Bain system, but the discharge of CO2 was not affected. The results showed that measurement of Pet CO2 as a non-invasive procedure can be commonly used to monitor OLV.
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