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Plethysmographic lung volumes in children with sighing dyspnea

Kin-Sun Wong1, Chih-Yung Chiu, Yu-Hsuan Huang

  • 1Department of Pediatrics, Division of Pediatric Pulmonology, Chang Gung Children's Hospital, Chang Gung University, College of Medicine, 5, Fu Hsin Street, Taoyuan, Taiwan. pchest@adm.cgmh.org.tw

Pediatrics International : Official Journal of the Japan Pediatric Society
|May 8, 2009
PubMed

Insights

Children with sighing dyspnea showed elevated residual volume (RV) and RV/total lung capacity (TLC), indicating potential gas trapping not detected by spirometry. Further research is needed to confirm the link between breathing patterns and lung volume changes.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology

Background:

  • Sighing dyspnea in children may be linked to lung hyperinflation or gas trapping.
  • Previous studies have not fully elucidated the relationship between dysfunctional breathing and lung volumes.

Purpose of the Study:

  • To compare plethysmographic lung volumes in children with sighing dyspnea versus healthy children.
  • To test the hypothesis that sighing dyspnea is caused by hyperinflation or gas trapping.

Main Methods:

  • Prospective enrollment of pediatric patients with sighing dyspnea and healthy controls.
  • Spirometry (pre- and post-bronchodilator) and plethysmography for lung volumes (TLC, RV, FRC).

Main Results:

  • No significant difference in forced vital capacity (FVC) or bronchodilator response between groups.
  • Elevated residual volume (RV) and RV/total lung capacity (TLC) in children with sighing dyspnea.
  • Total lung capacity (TLC) and functional residual capacity (FRC) were not increased in the sighing dyspnea group.

Conclusions:

  • Sighing dyspnea in children is associated with increased RV and RV/TLC, suggesting gas trapping not evident on spirometry.
  • The direct causal link between dysfunctional breathing and static lung volume changes remains undetermined.
  • Patient heterogeneity may obscure findings; larger cohorts are needed for further investigation.
Abstract

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