Figure 49-16 A, Sketch of the left-sided red rubber Robertshaw double-lumen endotracheal tube. B, Close-up of placement of the left-sided Robertshaw double-lumen endotracheal tube at the carina. C, Sketch of the right-sided Robertshaw double-lumen endotracheal tube. D, Close-up of placement of the right-sided Robertshaw double-lumen endotracheal tube at the carina. (From Benumof JL: Anesthesia for Thoracic Surgery. Philadelphia, WB Saunders, 1987.)