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For pregnant smokers, vitamin C supplements improve lung function of newborn
Date:5/18/2014

Supplemental vitamin C taken by pregnant smokers improved measures of lung function for newborns and decreased the incidence of wheezing for infants through 1 year, according to a study published by JAMA. The study is being released early online to coincide with its presentation at the American Thoracic Society International Conference.

More than 50 percent of smokers who become pregnant continue to smoke, corresponding to 12 percent of all pregnancies. Smoking during pregnancy adversely affects lung development, with lifelong decreases in pulmonary (lung) function. At birth, newborn infants born to smokers show decreased pulmonary function test (PFT) results, with respiratory changes leading to increased hospitalization for respiratory infections, and increased incidence of childhood asthma, according to background information on the article. In a study involving primates, vitamin C blocked some of the in-utero effects of nicotine on lung development and pulmonary function in offspring.

Cindy T. McEvoy, M.D., M.C.R., of Oregon Health & Science University, Portland, and colleagues randomly assigned pregnant smokers to receive vitamin C (500 mg/d) (n = 89) or placebo (n = 90). One hundred fifty-nine newborns of pregnant smokers (76 vitamin C treated and 83 placebo treated) and 76 newborns (reference group) of pregnant nonsmokers were studied with newborn PFTs (performed within 72 hours of age)

The researchers found that newborns of women randomized to vitamin C, compared with those randomized to placebo, had improved measures of pulmonary function. Offspring of women randomized to vitamin C had significantly decreased wheezing through age 1 year (15/70 [21 percent] vs 31/77 [40 percent]. There were no significant differences in the 1-year PFT results between the vitamin C and placebo groups.

"Although smoking cessation is the foremost goal, most pregnant smokers continue to smoke, supporting the need for a pharmacologi
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Contact: Tamara Hargens-Bradley
hargenst@ohsu.edu
503-494-8231
The JAMA Network Journals
Source:Eurekalert

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