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Wysłany: Sob 22:39, 05 Mar 2011 Temat postu: Smoking early in pregnancy raises jordan high heel |
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Smoking early in pregnancy raises risk of heart defects in infants: CDC
Maternal cigarette smoking in the first trimester was associated with a 20 to 70 percent greater likelihood that a baby would be born with certain types of congenital heart defects, according to a study by the U.S. Centers for Disease Control and Prevention.Congenital heart defects are the most common type of birth defects, contributing to approximately 30 percent of infant deaths from birth defects annually.
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 (right ventricular outflow tract obstructions) and openings between the upper chambers of the heart (atrial septal defects). The study was published Monday in the journal Pediatrics.
"Women who smoke and are thinking about becoming pregnant need to quit smoking and,[link widoczny dla zalogowanych], if they're already pregnant,[link widoczny dla zalogowanych], they need to stop,[link widoczny dla zalogowanych]," said CDC Director Thomas R. Frieden. "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,[link widoczny dla zalogowanych], 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,[link widoczny dla zalogowanych], that could potentially save 16 million dollars 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,[link widoczny dla zalogowanych]," said Adolfo Correa,[link widoczny dla zalogowanych], medical officer in CDC's National Center on Birth Defects and Developmental Disabilities.
The findings from the study, "Maternal Smoking and Congenital Heart Defects in the Baltimore-Washington Infant Study," are based on a large population-based case-control study of congenital heart defects conducted in the United States; 2,[link widoczny dla zalogowanych],525 case and 3,435 control infants born from 1981 to 1989 were included in this analysis.
Congenital heart defects are conditions present at birth that decrease the ability of the heart to work well,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych], which can result in an increased likelihood of death or long-term disabilities. They affect nearly 40,000 infants in the United States every year.
It is estimated that right ventricular outflow tract obstructions affect approximately 2,500 infants per year and atrial septal defects affect approximately 5,[link widoczny dla zalogowanych],600 infants per year in the United States. In 2004, U.S. hospital costs for all congenital heart defects were estimated at approximately 1.4 billion dollars.
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