NEONATAL intubation depth can be estimated with comparable accuracy and safety using two modified nasal–tragus length measurement methods, according to a randomised controlled trial involving 83 Thai neonates.
The findings suggested that a modified formula may improve optimal endotracheal tube positioning compared with a measurement-based table, although the difference was not statistically significant.
Comparing Neonatal Intubation Depth Methods
Researchers investigated two approaches for estimating appropriate orotracheal tube insertion depth in Thai neonates undergoing intubation.
The randomised controlled trial compared a modified nasal–tragus length (NTL) table method with a modified formula method.
The formula calculated insertion depth by adding 1 cm to NTL measurements of 6.5 cm or less, or 0.5 cm when measurements exceeded 6.5 cm.
A total of 83 neonates were randomly assigned to the two approaches, with 39 allocated to the table method and 44 to the formula method.
Estimated insertion depths were compared with radiographically determined appropriate depths. Researchers also evaluated positioning accuracy and short-term respiratory complications, including bronchial intubation, atelectasis, and unplanned extubation.
Formula Shows Higher Optimal Tube Placement Rate
Both approaches demonstrated strong correlations with radiographically determined appropriate insertion depth, with no statistically significant difference between methods (r=0.87 versus r=0.92; p=0.305).
The table method slightly underestimated insertion depth, whereas the formula method slightly overestimated it.
Mean differences from appropriate depth were −0.03±0.65 cm and 0.11±0.62 cm, respectively (p=0.314).
Optimal endotracheal tube placement within the mid-intrathoracic target zone was achieved in 49% of neonates using the table method, compared with 61% using the formula method (p=0.247).
Although the formula demonstrated a numerically higher optimal positioning rate, this difference did not reach statistical significance.
Radiographic Confirmation Remains Essential for Safety
Researchers found no significant difference in short-term respiratory complications between the two neonatal intubation methods.
These findings indicated that both modified NTL approaches offered comparable performance when estimating appropriate insertion depth in Thai neonates.
While the formula method showed a trend towards improved positioning within the mid-intrathoracic trachea, the evidence did not establish its superiority over the table method.
The researchers emphasised that radiographic confirmation remained essential following intubation to verify appropriate tube placement and minimise the risk of clinically significant respiratory complications.
Reference
Jaimuang S et al. Comparison of Two Modified Nasal-Tragus Length Methods for Estimating Orotracheal Tube Depth in Thai Neonates: A Randomized Controlled Trial. Neonatology. 2026. https://doi.org/10.1159/neo/adsag020
Photo credit: Carmen on Adobestock
Carmen on Adobestock
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