Smoking alters thyroid function of expectant mom and fetus

January 14th, 2009 - 2:24 pm ICT by ANI  

Peninsula Medical School

Washington, Jan 14 (ANI): Smoking during pregnancy can damage both the mother’’s and the baby’’s thyroid function, says a new study led by an Indian-origin researcher.

The study will be published in The Endocrine Society’’s Journal of Clinical Endocrinology & Metabolism (JCEM).

“We studied the influence of cigarette smoking on thyroid function of two groups of women at different stages of pregnancy one in the first trimester and the other in the third trimester,” said Dr. Bijay Vaidya, Ph.D., of Peninsula Medical School at Royal Devon and Exeter Hospital in the United Kingdom, and coauthor of the study.

“In both groups we found that smoking during pregnancy is associated with changes in the mothers” thyroid hormone levels, the expert added.

Optimal maternal thyroid function during pregnancy is vital for a successful pregnancy outcome, said Dr. Vaidya.

The adverse outcomes associated with thyroid dysfunction during pregnancy include increased risk of miscarriage, premature birth, low birth weight and impaired neuropsychological development of the baby.

Dr. Vaidya and his colleagues also measured thyroid hormone levels in the umbilical cord of babies born to smoking mothers and found that smoking-related changes in thyroid function extend to the fetus.

Dr. Vaidya believes that impaired thyroid function in the fetus could have potentially harmful biological consequences.

The study also found that in mothers who stopped smoking during pregnancy their thyroid hormone levels were comparable to levels found in non-smokers, which suggests that changes in thyroid function are rapidly reversible.

There is currently no definitive explanation for how smoking affects thyroid function, but Dr. Vaidya suggests that smoking may influence thyroid hormone levels by affecting the enzyme which converts the active form of thyroid hormone to an inactive form. (ANI)

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