[Preoperative special tests and intraoperative arterial oxygen partial pressure during one-lung ventilation]

The value of preoperative lung function tests was examined in 11 patients as a method to predict changes in intraoperative PaO2 (dPaO2) during one-lung ventilation in pulmonary surgery. Ventilation (Kr-81m and Xe-133) and perfusion (Tc-99m microspheres) to the lung to be operated upon significantly predicted the intra-operative decrease in PaO2. The correlation between ventilation percentage to the diseased lung and dPaO2 was 0.87 (SEE = 9.99) and between perfusion and dPaO2 0.84 (SEE = 9.51).