The effects of incremental continuous positive airway pressure on arterial oxygenation and pulmonary shunt during one-lung ventilation

摘要: Background: Although one lung ventilation (OLV) is frequently used for facilitating thoracic surgical procedures, arterial hypoxemia can occur while using anesthesia. Continuous positive airway pressure (CPAP) in 5 or 10 cmH2O to the non­ventilating commonly recommended prevent hypoxemia. We evaluated effects of incremental CPAP on oxygenation and pulmonary shunt without obstruction field during OLV. Methods: Twenty patients that were scheduled anesthesia included this study. Systemic hemodynamic data blood gas analysis was recorded every fifteen minutes according patient's positions levels. applied from 0 by 3 increments until a surgeon notifies obstructed expanded lung. Following that, fraction (Q S/QT) calculated. Results: There no significant differences Q S/QT between supine lateral with two (TLV). OLV significantly decreased oxygen partial (PaO2) increased QS/QT compared TLV. PaO2 improved at 6 9 cmH 2O cmH2O. However, there PaO 2 CPAP. In 18 (90%), fields Conclusions: This study suggests effectively interference when increments. (Korean J Anesthesiol 2012; 62: 256­259)