Airway Note that with neck flexion, the ETT moves on average 3.8 cm in the adult (but can move as much as 6.4 cm) Anatomy relevant to the placement of a DLT: R mainstem is 2.5 cm in length. In 10% of adults, RUL departs in < 2.5 cm, and in 2-3% of adults, the […]