Conflict of Interest
The authors declare that they have no competing interests.
Figure Legend
Fig1. Computed tomography images for measurements of different upper
tracheal levels Crosssectional area about this special patient. A, T2
vertebra (584.2 mm2). B, T3 vertebra(646.2
mm2). C, T4 vertebra(498.8mm2).
Fig2. Comparison of cross-sectional area of endotracheal tube balloon
cuff and patient trachea from T2 vertebra, T3 vertebra and T4 vertebra.