One-lung ventilation(OLV) is essential in thoracic surgery for patient safety and better surgical view. However, pulmonary complications such as hypoxemia may be caused by OLV which might be preventable with adequate alveolar recruitment and positive end-expiratory pressure(PEEP). Alveolar recruitment has been performed with conventional methods without diagnostic tools in clinical setting.~Ultrasound is a non-invasive, radiation-free device with high accuracy for the diagnosis of lung atelectasis. There are a few reports regarding the usefulness of lung ultrasound in other surgeries, but not in thoracic surgeries with OLV.~Thus, investigators designed a study to observe the effectiveness of ultrasound-guided alveolar recruitment in thoracic surgery with OLV.
To observe the effectiveness of ultrasound-guided alveolar recruitment in thoracic surgery with one-lung ventilation(OLV).