Arterial Blood Gas Changes During Penumonctomy and Lobectomy According to the Inspired O2 Concentration / 대한마취과학회지

ABSTRACT

At the Department of Anesthesiology, Ewha Womans University Hospital from June, 1984 to August, 1986, pneumonectomies and lobectomies in 12 patients were performed in the lateral position during two-lung ventilation. 5 patients (group l) were ventilated using a portex endotracheal tube with 50% N2O and 50% O2; 7 patients (greup ll),100% 02. Analysis of artierial blood gases, mean arterial pressure and heart rates were stdudied. Arterial samples were obtained during the following times: (1) preoperative period, (2) the closed-chest in the lateral position, (3) before the ligation of the bronchus in the open-chest, (4) after the ligation of the bronchus in the open.chest and (5) the postoperative period. The results were as follows : (1) In both groups PaO2, gradually decreased during all periods and was not significant. (2) After the ligation of the bronchus in the open-chest, PaO2 values were 199.1+/-64.5 mmHg (group I) and 322.7+/-112.4 mmHg (group ll), There was a significant difference between two groups but without clinical improtance (P < 0.05). We concluded that when pneumonectomy and lobectomy were performed in the lateral position by the use of two-lung ventilation with FiOa, 0.5 or more, PaO2 was maintained satisfactorily during the closed and open christ periods.