Pediatric anesthesia & critical care

The accuracy of the ultrasound measured transverse cricoid diameter and the epiphyseal transverse diameter of the distal radius in predicting the pediatric endotracheal tube size

Paediatr AnaesthPublished Diagnostic accuracy study

Authors' conclusion

Both transverse cricoid diameter and epiphyseal diameter of the distal radius are reliable predictors of the size of best-fit-ETT pediatric endotracheal tube compared to age-based formulas.

Study context

Population
Children (1–6 years) undergoing elective surgery with ETT
Participants
100 children
Comparison
Cuffed vs Uncuffed
  • Cuffedn = 50
  • Uncuffedn = 50
Outcome
Agreement between transverse cricoid diameter-based reference tube size (outer diameter) and final best-fit ETT

Performance

As reported in the abstract

Agreement rate, transverse cricoid diameter-based ETT size vs best-fit ETT size

Further findings

Correlation with best-fit ETT diameter

Significant positive correlation between best-fit ETT outer diameter and outer diameter by both ultrasound methods
Lower degree of positive correlation between best-fit ETT inner diameter and inner diameter by age-based formulas

Bland Altman agreement with best-fit ETT outer diameter

Agreement with epiphyseal diameter of distal radius in both groups and with transverse cricoid diameter in the cuffed group; no agreement with age-based formulas in either group

Original publication

The accuracy of the ultrasound measured transverse cricoid diameter and the epiphyseal transverse diameter of the distal radius in predicting the pediatric endotracheal tube size. Paediatr Anaesth. Published 29 September 2023. doi:10.1111/pan.14761

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