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Objective <p>To develop a prenatal biometry-based model predicting optimal oral endotracheal tube (ETT) depth in infants with birth weight &lt;500 g.</p> Study design <p>Retrospective single-center cohort of 62 infants (birth weight &lt;500 g) orally intubated at birth, with prenatal ultrasound within 3 days of delivery. Optimal ETT depth was determined from post-intubation radiographs. Femur length (FL), estimated fetal weight (EFW), biparietal diameter, head circumference, and abdominal circumference were assessed by correlation and multivariable regression.</p> Results <p>Gestational age was 25.2 ± 1.7 weeks; birth weight, 437 g (382.5–470 g). Malposition ≥0.5 cm occurred in 29 infants (46.8%). FL and EFW correlated strongly with optimal depth (r = 0.598 and 0.594; both <i>p</i> &lt; 0.001). The quadratic model combining FL and EFW yielded the best fit (adjusted R² = 0.58).</p> Conclusion <p>Prenatal FL and EFW may guide predelivery oral ETT depth in infants with birth weight &lt;500 g, supporting individualized airway planning.</p>

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Prenatal biometry-based prediction of optimal endotracheal tube depth in infants with a birth weight less than 500 g

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Kyusang Yoo,
  • Soo Hyun Kim,
  • Juhee Park,
  • Tae-Gyeong Kim,
  • Jung Il Kwak,
  • Jeong Min Lee,
  • Ha Na Lee,
  • Jiyoon Jeong,
  • Chae Young Kim,
  • Mi-Young Lee,
  • Euiseok Jung,
  • Jin Hoon Chung,
  • Byong Sop Lee,
  • Hye-Sung Won

摘要

Objective

To develop a prenatal biometry-based model predicting optimal oral endotracheal tube (ETT) depth in infants with birth weight <500 g.

Study design

Retrospective single-center cohort of 62 infants (birth weight <500 g) orally intubated at birth, with prenatal ultrasound within 3 days of delivery. Optimal ETT depth was determined from post-intubation radiographs. Femur length (FL), estimated fetal weight (EFW), biparietal diameter, head circumference, and abdominal circumference were assessed by correlation and multivariable regression.

Results

Gestational age was 25.2 ± 1.7 weeks; birth weight, 437 g (382.5–470 g). Malposition ≥0.5 cm occurred in 29 infants (46.8%). FL and EFW correlated strongly with optimal depth (r = 0.598 and 0.594; both p < 0.001). The quadratic model combining FL and EFW yielded the best fit (adjusted R² = 0.58).

Conclusion

Prenatal FL and EFW may guide predelivery oral ETT depth in infants with birth weight <500 g, supporting individualized airway planning.