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A Bedside Equation to Estimate Endotracheal Tube Length for Infants

Geoff Burnhill1, Jack Henshaw2, Stephanie Lapitan2

  • 1Paediatric Intensive Care Department, Evelina London Children's Hospital, London, United Kingdom.

The Journal of Pediatrics
|May 14, 2023
PubMed

Insights

A new bedside formula using weight can accurately estimate ideal endotracheal tube (ETT) length for infants. This simple method aids in optimal oral and nasal ETT placement for children under one year old.

Area of Science:

  • Pediatric Critical Care Medicine
  • Anesthesiology
  • Medical Engineering

Background:

  • Accurate endotracheal tube (ETT) length is crucial for safe and effective mechanical ventilation in infants.
  • Current methods for determining ETT length in children under one year are often imprecise, leading to potential complications.

Purpose of the Study:

  • To develop and validate a simple bedside equation for estimating the ideal oral and nasal ETT length in infants.
  • To improve the accuracy of ETT placement in pediatric patients.

Main Methods:

  • Retrospective analysis of 735 infants (<1 year) from a pediatric intensive care unit database.
  • Evaluation of 1176 endotracheal tube (ETT) positions using postintubation chest radiographs and bedside measurements.
  • Development of a regression formula based on patient weight.

Main Results:

  • Weight was found to be a superior predictor of optimal ETT length compared to age.
  • The derived formulas for optimal oral ETT length are (weight^2+8) cm and for nasal ETTs are (weight^2+9.5) cm.
  • The formulas demonstrated a mean absolute prediction error of 5% and did not require adjustments for prematurity or comorbidities.

Conclusions:

  • A simple bedside formula utilizing only patient weight can accurately estimate optimal oral and nasal ETT insertion length in children up to one year of age.
  • This formula offers a practical tool for clinicians to ensure appropriate ETT positioning, potentially reducing associated risks.
Abstract

Keywords:
anesthesiacritical careinfantintubationresuscitationventilation

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