Accurate positioning of the endotracheal tube in neonate is essential for adequate ventilation as well for surfactant administration. And this depth of insertion is best measured by measuring nasal septum to tragus length (NTL)in both preterm and term babies. The estimated insertion is calculated as NTL +1cmfrom the upper lip of the neonate.
Estimating tube length to be inserted as per formula weight (kgs) + 6 cmsmay lead to ETT to be inserted too far particularly in ELBW babies
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