Pulmonary Function; Newborn, Abnormal | Vitamin C to Decrease Effects of Smoking in Pregnancy on Infant Lung Function

Pulmonary Function; Newborn, Abnormal research study

What is the primary objective of this study?

Vitamin C supplementation (500 mg per day) given to pregnant women who can not quit smoking will improve the pulmonary function tests in their offspring measured at 3 months of age.

Who is eligible to participate?

Inclusion Criteria: At randomization: - Singleton gestation - ≥ 15 years old - Gestational age between 13 and 22 weeks - Receiving prenatal care - Current smoker - English speaking Exclusion Criteria: - Gestational age ≥ 23 and 0/7 weeks - Multiple gestation - Major fetal congenital anomalies - Current use of illicit drugs - Current alcohol abuse - Use of vitamin C (≥ 500 mg/day)>3 days per week since last menstrual period - Refusal to abstain from vitamin or supplements containing significant vitamin C other than those provided through or approved by study staff - History of kidney stone in patient - Insulin dependent diabetes - Complex maternal medical conditions - Participation in other conflicting research projects - Unable to demonstrate stable method of communication - Pregnancy by in-vitro fertilization - Plan to terminate pregnancy - Failure of medication compliance trial - Failure to return in designated period during placebo run-in - Body mass index > 50 at screening

Which medical condition, disease, disorder, syndrome, illness, or injury is researched?

Pulmonary Function; Newborn, Abnormal

Infant Wheeze

In-utero Nicotine

Second Hand Smoke

Study Interventions

Interventions can include giving participants drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available or noninvasive approaches such as surveys, education, and interviews.

Dietary Supplement:Vitamin C +prenatal vitaminPregnant smoking women will be randomized to daily vitamin C (500 mg) versus daily placebo

Dietary Supplement:Placebo tablet+prenatal vitamin

Study Arms

Research studies and clinical trials typically have two or more research arms. An arm is a group of people who receive the same treatment in the study.

placebo tablet+prenatal vitaminA daily placebo tablet

Vitamin C +prenatal vitamin500 mg vitamin C /day

Study Status


Start Date: December 2012

Completed Date: December 2017

Phase: Phase 2/Phase 3

Type: Interventional


Primary Outcome: Forced Expiratory Flow at 75% of Expired Volume (FEF75)

Secondary Outcome: Forced Expiratory Flow at 75% of Expired Volume (FEF75)

Study sponsors, principal investigator, and references

Principal Investigator: Cynthia T McEvoy, MD,MCR

Lead Sponsor: Oregon Health and Science University

Collaborator: National Heart, Lung, and Blood Institute (NHLBI)

More information:

Discuss Wheezing