OBJECTIVE: To determine the effect of smoking on maternal and fetal thyroid function. STUDY DESIGN: This prospective cohort study involved healthy women undergoing elective cesarean section for term singleton infants. Maternal and fetal thyroid indices were compared between smokers (n=21) and non-smokers (n=83). RESULTS: Maternal thyrotropin (TSH) concentrations were significantly lower in smokers than non-smokers (1.75 mIU/L versus 2.15 mIU/L, respectively, p=0.007), with similar free thyroxine (FT4) concentrations (9.59 pmol/L versus 9.56 pmol/L, p=0.755). For women who smoked, the correlation between the average number of cigarettes smoked per day and maternal TSH concentrations was -0.427, p=0.054. Infants of smokers and non-smokers had similar umbilical TSH (5.43 mIU/L versus 5.82 mIU/L, p=0.124) and FT4 concentrations (13.06 pmol/L versus 13.57 pmol/L, p=0.049). CONCLUSION: We demonstrated for the first time that women who smoke during pregnancy have significantly lower TSH concentrations than non-smokers.
OBJECTIVE: To determine the effect of smoking on maternal and fetal thyroid function. STUDY DESIGN: This prospective cohort study involved healthy women undergoing elective cesarean section for term singleton infants. Maternal and fetal thyroid indices were compared between smokers (n=21) and non-smokers (n=83). RESULTS: Maternal thyrotropin (TSH) concentrations were significantly lower in smokers than non-smokers (1.75 mIU/L versus 2.15 mIU/L, respectively, p=0.007), with similar free thyroxine (FT4) concentrations (9.59 pmol/L versus 9.56 pmol/L, p=0.755). For women who smoked, the correlation between the average number of cigarettes smoked per day and maternal TSH concentrations was -0.427, p=0.054. Infants of smokers and non-smokers had similar umbilical TSH (5.43 mIU/L versus 5.82 mIU/L, p=0.124) and FT4 concentrations (13.06 pmol/L versus 13.57 pmol/L, p=0.049). CONCLUSION: We demonstrated for the first time that women who smoke during pregnancy have significantly lower TSH concentrations than non-smokers.
Authors: Merle D Benedict; Stacey A Missmer; Kelly K Ferguson; Allison F Vitonis; Daniel W Cramer; John D Meeker Journal: Environ Toxicol Pharmacol Date: 2012-09-23 Impact factor: 4.860
Authors: Bram G Janssen; Nelly D Saenen; Harry A Roels; Narjes Madhloum; Wilfried Gyselaers; Wouter Lefebvre; Joris Penders; Charlotte Vanpoucke; Karen Vrijens; Tim S Nawrot Journal: Environ Health Perspect Date: 2016-09-13 Impact factor: 9.031