Womenwho smoke cigarettes in their first trimester of pregnancy have a 20 to 70 percent greater likelihood of giving birth to babies with certain types of congenital heart defects, anewstudy by the Centers for Disease Control and Prevention (CDC)finds.
The study found an association between tobacco exposure and certain types of defects such as those that obstruct the flow of blood from the right side of the heart into the lungs and openings between the upper chambers of the heart (atrial septal defects). The study is in the Feb. 28 issue of the journal Pediatrics.
"Women who smoke and are thinking about becoming pregnant need to quit smoking and, if they're already pregnant, they need to stop," said CDC Director Thomas R. Frieden, M.D., M.P.H. "Quitting is the single most important thing a woman can do to improve her health as well as the health of her baby."
Based on the findings of this and other studies, eliminating smoking before or very early in pregnancy could prevent as many as 100 cases of right ventricular outflow tract obstructions and 700 cases of atrial septal defects each year in the United States. For atrial septal defects alone, that could potentially save $16 million in hospital costs.
"Successfully stopping smoking during pregnancy also lowers the chances of pregnancy complications such as preterm delivery and that an infant will have other complications such as low birth weight," said Adolfo Correa, M.D., Ph.D., medical officer in CDC's National Center on Birth Defects and Developmental Disabilities.
