Maternal and neonatal urinary iodine excretion and neonatal TSH in relation to use of antiseptic during caesarean section in an iodine sufficient area.

AIM: To evaluate the influence of topical iodine-containing antiseptics on neonatal TSH in full-term infants born by Caesarean section in an iodine sufficient area. POPULATION AND METHODS: Urinary iodide excretion (UIE) was estimated in 86 mothers on the second day after delivery by Caesarean section and their 86 full-term neonates. The mothers were divided into two groups according to the use of antiseptic to prepare Cesarean sections: 42 mothers who were prepared with povidone-iodine (Isosept, Bosnalijek) comprised the study group, and 47 mothers who were prepared with alcoholic solution (Skinsept color, Ecolab) formed the control group. Neonatal TSH was measured in whole blood drawn between day 3 and 5 of life, spotted on filter paper using a sensitive fluorometric assay (Delfia). RESULTS: Maternal and neonatal UIE were significantly higher (p < 0.05) in the study group compared to the control group. No significant difference was found for neonatal TSH. CONCLUSION: Our data suggest that perinatal iodine exposure of full-term neonates who were born by Caesarean section in an iodine sufficient area did not influence neonatal TSH, although median UIE was higher, suggesting optimal iodine intake during pregnancy. Further research is needed to define a critical value of urinary iodine concentrations in full-term neonates in an iodine sufficient area that may lead to the impairment of thyroid function.

Iodine nutrition status of pregnant women in an iodine-sufficient area.

BACKGROUND: Iodine is necessary for the synthesis of thyroid hormones, which play a decisive role in the development of the brain during fetal and early postnatal life. OBJECTIVE: To evaluate whether prophylaxis with 20 to 30 mg of iodine per kilogram of salt is enough to ensure optimal iodine nutrition during pregnancy in an iodine-sufficient area. METHODS: A cross-sectional study of pregnant women was conducted in 2007. The urinary iodine concentration (UIC) was measured in 300 randomly selected women in Tuzla, Bosnia, and Herzegovina, in all three trimesters of pregnancy. RESULTS: The median UIC of the pregnant women was 142 microg/L, ranging from 27 to 1,080 microg/L. The median UIC of the pregnant women in each trimester of pregnancy who were not restricting their salt intake was consistent with adequate iodine nutrition, as defined by the World Health Organization Technical Consultation, whereas the median UIC of women who were restricting their salt intake was insufficient. CONCLUSIONS: Pregnant women in the urban area of Tuzla had adequate iodine status except for those with restricted salt intake, which presents an increased risk to the mother as well to as the unborn child. Women in the rural area of Tuzla were found to be iodine-deficient, regardless of whether they had restricted their salt intake or not. However, for those pregnant women who have been advised to restrict their salt intake and who thus face the risk of iodine deficiency, the use of salt with higher concentrations of iodine could be advised.

Excess dietary iodine intake in long-term African refugees.

OBJECTIVE: To assess the iodine status of long-term refugees dependent on international food aid and humanitarian assistance. DESIGN: A series of cross-sectional two-stage cluster or systematic random sample surveys which assessed urinary iodine excretion and the prevalence of visible goitre. Salt samples were also collected and tested for iodine content by titration. SETTING: Six refugee camps in East, North and Southern Africa. SUBJECTS: Male and female adolescents aged 10-19 years. MAIN RESULTS: The median urinary iodine concentration (UIC) ranged from 254 to 1200 microg l(-1) and in five of the camps exceeded the recommended maximum limit of 300 microg l(-1), indicating excessive iodine intake. Visible goitre was assessed in four surveys where it ranged from 0.0 to 7.1%. The camp with the highest UIC also had the highest prevalence of visible goitre. The iodine concentrations in 11 salt samples from three camps were measured by titration and six of these exceeded the production-level concentration of 20 to 40 ppm recommended by the World Health Organization (WHO), but were all less than 100 ppm. CONCLUSIONS: Excessive consumption of iodine is occurring in most of the surveyed populations. Urgent revision of the level of salt iodisation is required to meet current WHO recommendations. However, the full cause of excessive iodine excretion remains unknown and further investigation is required urgently to identify the cause, assess any health impact and identify remedial action.