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Tracheal length of infants under three months old
1Department of Otolaryngology--Head and Neck Surgery, Mackay Memorial Hospital, Taipei, Taiwan.
Insights
Measuring infant airway length is challenging. This study found vocal fold to carina length in infants under 3 months correlates best with body weight, not sex.
Area of Science:
- Pediatric Pulmonology
- Medical Imaging
- Anatomy
Background:
- Accurate in vivo measurement of tracheal length in infants is clinically difficult.
- Infant tracheal length exhibits significant variability with age and other factors, unlike adults.
- Establishing normative airway dimensions is crucial for pediatric respiratory care.
Purpose of the Study:
- To evaluate infant airway length using video rigid ventilation bronchoscopy.
- To determine normative values for vocal fold to carina and tracheal lengths in infants < 3 months.
- To investigate correlations between airway length and infant demographics (sex, weight, height, age).
Main Methods:
- Video rigid ventilation bronchoscopy was employed in 34 infants (< 3 months old).
- Measurements included length from the superior border of the vocal fold to the carina and tracheal length (first tracheal ring to carina).
- Statistical analysis assessed differences between sexes and correlations with body weight, height, and age.
Main Results:
- Mean vocal fold to carina length was 5.04 cm; mean tracheal length was 4.12 cm.
- No significant sex-based differences were observed in either airway measurement.
- Vocal fold to carina length showed the strongest correlation with body weight, followed by height and age.
Conclusions:
- This study provides normative airway length data for infants younger than 3 months.
- Body weight is the primary determinant of vocal fold to carina length in this population.
- These findings aid in optimizing airway management and device selection in neonates and young infants.
Abstract:
The measurement of tracheal length in infants is difficult to perform in vivo. In adults, tracheal length may be consistent with age, but in infants, tracheal length may vary much more with age and other factors. This study used video rigid ventilation bronchoscopy to evaluate the length of the airway, concentrating on the population younger than 3 months old. There were 34 infants in this study: 14 boys and 20 girls. The mean length from the superior border of the vocal fold to the carina was 5.04 cm, and the mean tracheal length (from the ridge of the first tracheal ring to the carina) was 4.12 cm. There was no significant difference between boys and girls in the length from the vocal fold to the carina or in the tracheal length. The length from the vocal fold to the carina is best correlated to body weight, followed by body height and age.