Ultrasonography for Endotracheal Tube Placement Confirmation

Ultrasonography for endotracheal tube placement confirmation has emerged as a rapid, non-invasive adjunct to traditional methods such as capnography and radiography. By employing high-frequency sound waves at the bedside, clinicians can visualise the tube within the tracheal lumen in real time. This technique is particularly valuable in emergency and critical care environments where prompt verification of correct tube depth and position is crucial to prevent oesophageal intubation, endobronchial migration or inadvertent extubation. Ultrasonography offers immediate feedback, reduced reliance on ionising radiation and potential for repeated assessments without patient transfer. Advances in probe positioning, image interpretation protocols and portable device technology have expanded its application across adult, paediatric and neonatal populations. Despite operator dependence and a learning curve, standardised training pathways and integration into airway management algorithms have enhanced its reliability. Globally, the method holds promise for resource-limited settings by offering a cost-effective, portable tool that can improve patient safety during airway management.

Research from Nature Portfolio

Recent studies have applied machine learning to refine predictions of optimal endotracheal tube depth, tailoring insertion length to individual patient characteristics. A novel model trained on paediatric patient data including age, height, weight and tube diameter demonstrated a significant reduction in inappropriate tube placement compared to formula-based approaches, halving the rate of misplacement. This approach underscores the potential of combining ultrasonographic assessments with predictive algorithms to guide initial tube advancement and reduce reliance on post-intubation adjustments.

Ultrasonography for Endotracheal Tube Placement Confirmation publication trend

The graph below shows the total number of articles in ultrasonography for endotracheal tube placement confirmation across all publications each year (not limited to Nature Index journals).

Technical terms

Point-of-care ultrasound: Bedside ultrasonographic imaging performed by the treating clinician to guide diagnostic or therapeutic procedures.

Capnography: Continuous monitoring of exhaled carbon dioxide concentration, used to verify ventilation and tube placement.

Trans-tracheal ultrasound: Sonographic technique placing the probe over the anterior neck to visualise the tracheal lumen and endotracheal tube.

Carina: The anatomical bifurcation of the trachea into the main bronchi, used as a landmark for appropriate tube depth.

Endobronchial intubation: Unintended advancement of the endotracheal tube past the carina into one bronchus, risking ventilation mismatch.

References

1. Predicting the risk of inappropriate depth of endotracheal intubation in pediatric patients using machine learning approaches. Scientific Reports (2023).
2. Real-Time Tracheal Ultrasound vs. Capnography for Intubation Confirmation during CPR Wearing a Powered Air-Purifying Respirator in COVID-19 Era. Diagnostics (2024).
3. Sonographic Evaluation of the Endotracheal Tube Position in the Neonatal Population: A Comprehensive Review and Meta-Analysis. Frontiers in Pediatrics (2022).
4. A feasibility study on bedside upper airway ultrasonography compared to waveform capnography for verifying endotracheal tube location after intubation. The Ultrasound Journal (2013).
5. Defining the learning curve of point-of-care ultrasound for confirming endotracheal tube placement by emergency physicians. The Ultrasound Journal (2015).