Voraruth et al used the nasal-tragus length of a Thai neonate to determine the optimal insertion depth of an endotracheal tube. The authors are from Mahidol University in Bangkok.
Patient selection: Thai neonate
Exclusion: facial dysmorphism, facial injury
Optimal insertion depth: a tip to lip distance with the tip at the body of T2 on chest X-ray
Parameters:
(1) nasal-tragus length in cm
optimum insertion depth at T2 in cm =
= (0.903 * (distance)) + 0.897
Nasal-Tragus Distance
Insertion Depth
4.5 to 5.0 cm
5.0 cm
5.1 to 5.5 cm
5.5 cm
5.6 to 6.0 cm
6.0 cm
6.1 to 6.5 cm
6.5 cm
6.6 to 7.0 cm
7.0 cm
7.1 to 7.5 cm
7.5 cm
7.6 to 8.0 cm
8.0 cm
8.1 to 8.5 cm
8.5 cm
8.6 to 9.5 cm
9/0 cm
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