Dynamic changes in the arterial blood and hemodynamic measures. Dynamic changes in the arterial blood gas and hemodynamic measures in individual patients during one-lung ventilation were monitored every 30 min between T1 and T2. Data are expressed as the mean ± SD of each group (n = 25). Filled circle and triangle represent the air and carbon dioxide groups, respectively. #P < 0.05 compared with air group. Fico₂ = fraction of inspired carbon dioxide; Fio₂ = fraction of inspired oxygen; HR = heart rate; MAP = mean arterial pressure; Paco₂ = arterial partial pressure of carbon dioxide; Pao₂ = arterial partial pressure of oxygen; Petco₂ = pressure of end-tidal carbon dioxide; pH = potential of hydrogen; T1 = before one-lung ventilation; T2 = 30 min after reexpansion.