The relationship between tracheal width and left bronchial width: Implications for left-sided double-lumen tube selection

Objective: To determine if there is a relationship between tracheal width ( TW) and left bronchial width (LBW). Design: Three-dimensional chest computed tomography (CT) scans were used to reconstruct major airways for measurement of TW and LBW. Setting: Stanford University Medical Center, Stanford, California. Participants: Thirty-one adult patients undergoing chest CT scans. Interventions: Cursors were used to directly measure internal diameter from coronal images of the trachea at mid-clavicular level end the left main br onchus at a level 1 cm below the carina. Measurements and Main Results: TW and LBW, but not the LBW-to-TW ratio, wer e significantly larger in men than in women. The LBW-to-TW ratio was consis tent fbr men (0.75 +/- 0.09) and women (0.77 +/- 0.10). Conclusions: LBW is proportional to TW. If LBW cannot be measured directly but TW can, the ratio of LBW to TW can be used to predict LBW. An appropria te-sized left double-lumen tube can then be selected for the patient. Copyr ight (C) 2001 by W.B. Saunders Company.