Fig. 5. Options in treating hypoxemia during one-lung ventilation (OLV). It is important to first relieve hypoxemia but then find the cause of hypoxemia. Fiberoptic bronchoscopy is important in correcting tube position and clearing secretions or blood in the ventilated lung and thus correcting the cause of hypoxemia during OLV. CPAP = continuous positive airway pressure; Fio2= fraction of inspired oxygen.