A: Yes – but it’s intentional. We stop pumping air into the lung to allow the lung to be in a resting state during a VATS procedure in order to provide complete visualization of the intrathoracic cavity, and ensure success. The double-lumen tube is used to control the airway and separate the two lungs by not allowing air into the lung that is being operated on. Once the procedure is complete, the air is allowed re-enter the lung, allowing it to naturally re-expand. Upon completion of surgery, a chest tube is inserted to facilitate a return to the natural state.