Singh et al reported equations for predicting the insertion distance of an endotracheal tube for a neonate. The authors are from Sir Ganga Ram Hospital in New Delhi.
Patient selection: neonate in India
Optimum endotracheal tube insertion: 0.5-1.0 cm above the aortic arch (by sonography)
Parameters (measured with a flexible, non-stretchable tape):
(1) body weight in kilograms
(2) occipitofrontal circumference in cm (OFC): maximum head circumference, passing over the occiput and supraorbital ridges
(3) nasal tragus length in cm (NTL): distance between the base of the nasal septum and the tip of the tragus (the cartilaginous projection immediately anterior to the external auditory meatus)
(4) sternal length in cm (SL)
(5) crown heel length in cm (CHL)
insertion length in cm =
= (weight) + 4.95
= (0.223 * (OFC)) + 0.49
= (0.822 * (NTL)) + 1.24
= (0.752 * (SL)) + 2.26
= (0.154 * (CHL)) + 0.57
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