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Infant pulmonary function tests in individuals with Down syndrome

Oded Breuer1, Laurice Boursheh1, Ephraim Bar-Yishay2

  • 1Pediatric Pulmonology and CF Unit, Department of Pediatrics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.

Respiratory Medicine
|November 4, 2022
PubMed

Insights

Infants with Down syndrome exhibit fixed airflow obstruction, not restrictive lung disease, with decreased expiratory flows and altered breathing mechanics. This early-life lung disease requires further study for improved respiratory management in Down syndrome.

Area of Science:

  • Pediatric Pulmonology
  • Genetics and Respiratory Health
  • Infant Lung Function

Background:

  • Down syndrome is linked to significant respiratory issues.
  • Previous studies indicated restrictive lung disease in older individuals with Down syndrome.
  • Infant pulmonary function tests (iPFTs) in Down syndrome are not well-characterized.

Purpose of the Study:

  • To evaluate infant pulmonary function tests (iPFTs) in infants with Down syndrome.
  • To characterize early-life lung disease phenotypes in infants with Down syndrome.
  • To compare iPFTs in infants with Down syndrome to a healthy control group.

Main Methods:

  • Observational case-control study using registry data (2008-2018).
  • Compared iPFTs from 20 infants with Down syndrome to 46 healthy controls.
  • Statistical analysis included Mann-Whitney U and Fisher's exact tests.

Main Results:

  • Infants with Down syndrome demonstrated an obstructive lung disease phenotype.
  • Key findings include mildly increased lung volumes and significantly decreased expiratory flows.
  • Airflow limitation was prominent at low lung volumes (V˙max FRC: 48% predicted vs. 100% in controls, p < 0.001).
  • Reduced respiratory system compliance and increased airway resistance were observed.

Conclusions:

  • Infants with Down syndrome present with a fixed airflow obstruction phenotype.
  • This study provides crucial data on early-onset lung disease in Down syndrome.
  • Further research is needed to optimize respiratory disease management in this population.
Abstract

Keywords:
Bronchodilator responsivenessDown syndromeIncreased lung volumesInfant pulmonary function testsRestrictive lung diseaseSmall airway obstruction and obstructive lung disease

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