NCT06106646

Vitamin C to Decrease Effects of Smoking in Pregnancy on Infant Lung Function (VCSIP) Longer Term Follow Up

Assessing the Effect of Vitamin C on Infant Lung Function When Given to Pregnant Women Who Smoke - (Long Term Follow-up of a Randomized Trial)

• Status: Recruiting
• Phase: —
• Study type: Observational
• Enrollment: 225 (estimated)
• Sponsor: Oregon Health and Science University · Academic / Other
• Sex: All
• Age: 6 Years – 16 Years
• Healthy volunteers: Not accepted

Summary

The overall aims of this protocol are to determine whether prenatal supplementation with vitamin C to pregnant smokers can improve pulmonary function at 10 years of age in their offspring. This is an additional continuation of the Vitamin C to Decrease Effects of Smoking in Pregnancy on Infant Lung Function (VCSIP) trial, to follow the offspring through 10 years of age. The hypothesis for this protocol is an extension of the VCSIP trial that supplemental vitamin C in pregnant smokers can significantly improve their children's airway function tests. The investigators aim to demonstrate sustained improvement in airway/pulmonary function and trajectory through 10 years of age.

Detailed description

The primary outcome of this longitudinal follow-up study is the comparison of airway function tests (specifically the forced expiratory flow between 25%and 75% of expired volume \[FEF25-75\]) measured yearly through 10 years of age by forced expiratory maneuvers with spirometry between the children of the pregnant smokers randomized to vitamin C (500 mg/day) versus placebo during pregnancy. The occurrence of wheeze obtained with quarterly standardized respiratory questionnaires will also be compared between the two groups of children. This is a follow-up of the original "Vitamin C to Decrease Effects of Smoking in Pregnancy on Infant Lung Function" (VCSIP) trial. The secondary outcomes are: 1. A single low dose high-resolution computed tomography (HRCT) image of the lungs (acquired during inspiration) will be done at 10 years of age in offspring of pregnant smokers who were randomized to vitamin C (500 mg/day) versus placebo during pregnancy. Image analysis will be performed by Dr. Miranda Kirby's Quantitative Image Analysis in Medicine laboratory at Ryerson University in Toronto, ON using certified pulmonary image analysis software. The airway lumen cross sectional areas to at least the fifth generation of airways will be compared between the two groups of children. The number of airways and the lumen, wall, and total cross sectional areas and the segment lengths will also be quantified. 2. A secondary aim is to quantify the differences in DNA methylation between the two groups and measure the correlation between the differences in DNA methylation and respiratory outcomes.

Conditions

• Asthma
• Pulmonary Function
• Wheezing
• In Utero Nicotine

Interventions

Type	Name	Description
DIETARY_SUPPLEMENT	No active intervention in this protocol (previously randomized to Vitamin C)	In the original VCSIP study, pregnant women were randomized to receive either extra Vitamin C every day (500mg/day) or placebo. This trial is a follow-up trial with no active intervention.
OTHER	No active intervention in this protocol (previously randomized to Placebo)	In the original VCSIP study, pregnant women were randomized to receive either extra Vitamin C every day (500mg/day) or placebo. This trial is a follow-up trial with no active intervention.

Timeline

• Start date: 2023-10-11
• Primary completion: 2027-08-01
• Completion: 2028-08-01
• First posted: 2023-10-30
• Last updated: 2025-03-18

Locations

2 sites across 1 country: United States