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Respiratory function in healthy young children using forced oscillations.

Graham L Hall1, Peter D Sly, Takayoshi Fukushima

  • 1Respiratory Medicine, Princess Margaret Hospital for Children, and School of Paediatric and Child Health, University of Western Australia, Perth, 6840 Australia. graham.hall@health.wa.gov.au

Thorax
|January 26, 2007
PubMed
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This study establishes reference ranges for respiratory function in healthy children aged two to seven years using the forced oscillation technique. The findings demonstrate good repeatability, aiding in the diagnosis and management of pediatric respiratory conditions.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology

Background:

  • Monitoring respiratory function is crucial for diagnosing and managing respiratory diseases.
  • The forced oscillation technique (FOT) is ideal for assessing lung function in young children due to minimal cooperation requirements.

Purpose of the Study:

  • To develop reference ranges for respiratory impedance variables in healthy children.
  • To document the short-term repeatability of FOT measurements in this pediatric population.

Main Methods:

  • FOT with a pseudo-random noise signal (4–48 Hz) was used to measure respiratory function in healthy children.
  • Respiratory resistance (Rrs) and reactance (Xrs) were assessed at 6, 8, and 10 Hz.
  • Repeatability was evaluated over a 15-minute period, and regression equations/Z-scores were determined.

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Main Results:

  • Data were collected from 158 healthy children (2–7 years old).
  • Respiratory mechanics showed linear relationships with height.
  • Within-test variability was 6–9% for resistance and 17–20% for reactance; no significant changes were observed over 15 minutes.

Conclusions:

  • Reference ranges for respiratory impedance variables in healthy children (2–7 years) are provided.
  • The study reports the short-term repeatability of FOT variables in this age group.
  • These data enable the definition of appropriate cut-off values for therapeutic interventions.