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Changes in respiratory mechanics with age

C J Lanteri1, P D Sly

  • 1Division of Clinical Sciences, Western Australian Research Institute for Child Health, Perth.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1993
PubMed
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Respiratory system resistance and airway resistance decrease with height in children. Respiratory system compliance increases with height, while tissue resistance (Pdif) changes with age.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Understanding respiratory mechanics in children is crucial for optimizing mechanical ventilation.
  • Age-related changes in lung function can significantly impact ventilation strategies.

Purpose of the Study:

  • To investigate age-related changes in respiratory mechanics in mechanically ventilated children.
  • To differentiate between airway resistance and tissue viscoelastic resistance.

Main Methods:

  • A cross-sectional study of 51 children (3 weeks to 15 years) undergoing anesthesia.
  • Utilized single- and two-compartment models, multilinear regression, and the interrupter technique.
  • Measured respiratory system resistance (Rrs), airway resistance, and tissue viscoelastic resistance (Pdif).

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Main Results:

  • Respiratory system resistance (Rrs) and airway resistance decreased with increasing height.
  • Respiratory system compliance progressively increased with height.
  • Tissue viscoelastic resistance (Pdif) decreased in the first two years of life and increased after age five.

Conclusions:

  • Respiratory mechanics change significantly with age and height in children.
  • Height is a key determinant of respiratory system resistance and compliance.
  • Age-specific patterns exist for tissue viscoelastic resistance in pediatric patients.