A Prospective Descriptive Study of the Individualized Capnography of Both Lungs During One-lung Ventilation With Double-lumen Tube

A prospective descriptive study of the use of an individualized capnography to each lung in the context of one-lung ventilation achieved with a double-lumen tube. \- Pilot project and proof of concept Brief Summary: * One study suggests a way to predict possible events of hypoxemia (Sat O2 \< 90%) during one lung ventilation (OLV) with the use of two individualized capnography devices on each lung during two-lung ventilation before inducing OLV. * In addition, a recent presentation in the 2021 Thoracic Anesthesia Symposium suggested possible benefits of the use of a capnography device on the non-ventilated lung in the detection of air leaks around the bronchial cuff. * The same presentation demonstrated the utility of EtCo2 measurement to determine the achievement of complete lung collapse. With these previous demonstrations, the use of an individualized capnography for each lung can potentially describe different steps during thoracic surgery. Therefore, a descriptive prospective study on patients that require thoracic surgery with use of a double lumen tube is proposed to verify the feasibility of dual capnography during OLV. The use of two different devices, randomized during our study, will also help to identify the impact of different air aspiration levels on our measures. Such results will allow to put forward prospective projects to help to optimize OLV during thoracic surgeries.