A technique not yet described in the literature and allowing anesthesiologists who do not regularly practice fibroscopy or who do not routinely have this type of apparatus for their procedures, to install straight double-lumen tubes without compromising the ventilation of the patient. The aim is to introduce a central venous catheter wire guide into the bronchial arm of the right double-lumen tube and insert it into the right upper lobe bronchus orifice under fluoroscopic control. Then, to validate the new technique, we will carry out a fibroscopic control.