Spirometry Versus Forced Oscillation to Assess Lung Function Outcome at 5 Years of Age

Area of Science:

• Pediatric Respiratory Medicine
• Pulmonary Function Testing

Background:

• Spirometry is standard for airway function assessment but challenging in young children.
• Forced oscillation technique (FOT) requires less cooperation, increasing interest for pediatric use.
• This study compares spirometry and FOT in detecting treatment effects in young children.

Purpose of the Study:

• To evaluate if spirometry and FOT yield comparable results in detecting a treatment effect in young children.
• To assess the efficacy of vitamin C supplementation in mothers who smoked during pregnancy (MSDP) on offspring respiratory health.

Main Methods:

• A randomized controlled trial involving vitamin C vs. placebo for MSDP was previously conducted.
• Offspring respiratory impedance was measured using 8-Hz FOT at ages 3, 4, and 5.
• Forced expiratory flows (FEFs) were measured via spirometry at 5 years of age.

Main Results:

• Spirometry showed significantly higher FEFs in the vitamin C group compared to placebo at age 5 (p < 0.001).
• FOT impedance measurements did not detect a similar significant treatment effect.
• Vitamin C treatment was previously associated with less wheeze in offspring at 4-6 years.

Conclusions:

• While spirometry can be challenging in preschoolers, FEFs appear more sensitive than single-frequency FOT impedance for detecting airway function improvements in this age group.
• FEFs may be a more reliable outcome measure than FOT for evaluating interventions in young children.
• Further research may refine FOT techniques for pediatric application.