LAUSR

High FiO2 during one-lung ventilation (OLV) can improve oxygenation, but increase the risk of atelectasis and oxidative stress. The aim of this study was to analyze whether Prostaglandin E1 (PGE1) can improve oxygenation and attenuate oxidative stress during OLV under a lower FiO2. Ninety patients selectively undergoing thoracotomy for esophageal cancer were randomly divided into three groups (n = 30/group): Group P (FiO2 = 0.6, inhaling PGE1 0.1 μg/kg), Group L (FiO2 = 0.6) and Group C (FiO2 = 1.0). The primary outcomes were oxygenation and pulmonary shunt during OLV. Secondary outcomes included haemodynamics, respiratory mechanics and oxidative stress in serum. Patients in Group P had significantly higher PaO2 and lower shunt fraction in 30 min of OLV compared with Group L. Compared with Group C, patients in Group P had similar levels of PaO2/FiO2 in 60 min and higher levels of PaO2/FiO2 at 2 h during OLV. The levels of PvO2 and SvO2 in Group P and Group L were significantly lower than Group C. Patients in Group P and Group L had significantly higher levels of superoxide dismutase and lower levels of malondialdehyde than Group C. No significant differences were found in SPO2, ETCO2, PaCO2, Paw, HR and MAP among the three groups. The complications in Group C were significantly higher than another two groups. PGE1 can maintain adequate oxygenation in patients with low FiO2 (0.6) during OLV. Reducing FiO2 to 0.6 during OLV can decrease the levels of oxidative stress and complications after OLV. chictr.org.cn identifier: ChiCTR1800017100.