Fig. 2.
Analysis of arterial blood samples. The levels of arterial blood Paco2, pH, and Spo2 as well as the Pao2/Fio2 in individual patients at the indicated time points during one-lung ventilation were measured and are expressed as the mean ± SD for each group of patients (n = 25 per group). Filled circle and triangle represent the air and carbon dioxide groups, respectively. #P < 0.05 compared with air group. Paco2 = arterial partial pressure of carbon dioxide; pH = potential of hydrogen; Spo2 = oxygen saturation of pulse oximeter; T1 = before one-lung ventilation; T2 = 30 min after reexpansion; T3 = 24 h postoperation; T4 = 48 h postoperation; T5 = 72 h postoperation.