Fetal exposure to bisphenol A: Presence of bisphenol A in urine of pregnant women assisted in a hospital in the City of Buenos Aires. Year 2013. / [Exposición fetal a bisfenol A: Presencia de bisfenol A en orina de mujeres gestantes asistidas en un hospital de la Ciudad de Buenos Aires. Año 2013.]

Introduction: Bisphenol A (BPA) is an endocrine disruptor (ED) possibly linked to adverse reproductive and neurodevelopmental effects that is used as an additive in food and beverage containers. There are no data of BPA levels in the Argentine population. The objective of this study was to measure BPA in the urine of pregnant women. Methods: Cross-sectional study. Detection of BPA in pregnant women of the Hospital Italiano de Buenos Aires in 2013, using gas chromatography and mass spectrometry with a limit of quantification of 2 ng / ml and detection of 0.8 ng / ml. The proportion of women exposed to BPA within the 95% confidence interval (IC 95%) is described. Results: 149 pregnant women, average age 32 years (Standard Deviation 5.3), 81% (95% CI 73.9-86.9) workers and 83.7% (95% CI 76.7-89.1) have university or higher education, 66.4% (95% CI 58-74.0) of the urinary samples were quantifiable, with a median BPA of 4.3 ng/mg Cr (RI 3.2-6.7). Conclusions: This study shows that exposure to BPA during the process of embryonic development in a sector of the population of Argentina is widespread. In Argentina, the use of this ED is only regulated in baby bottles.

Introducción: El Bisfenol A (BPA) es un disruptor endócrino (DE) posiblemente vinculado a eventos adversos reproductivos y del desarrollo neurológico que se utiliza como aditivo en envases plásticos de alimentos y bebidas. En la población argentina no existen datos sobre niveles de BPA en orina. El objetivo del estudio fue medir la presencia de BPA en orina de embarazadas. Métodos: Estudio transversal. Detección de BPA en orina de embarazadas atendidas en el Hospital Italiano de Buenos Aires en el año 2013. La técnica utilizada fue cromatografía gaseosa asociada a espectrometría de masa con un límite de cuantificación de 2 ng/ml y de detección de 0,8 ng/ml. Se describe la proporción de mujeres con exposición al BPA con su intervalo de confianza del 95% (IC95%). Resultados: se analizaron 149 muestras de orina de embarazadas de edad promedio 32 años (Desvío Standard 5,3), el 81% (IC95% 73,9-86,9) trabaja y el 83,7% (IC95% 76,7-89,1) posee nivel universitario y/o posgrado.El 66,4% (IC95% 58,2-74,0) de las muestras urinarias presentaron BPA cuantificable, siendo la mediana de BPA de 4,3 ng / mg creatinina (Rango Intercuartilo 3,2-6,7). Conclusiones: Este estudio muestra que la exposición a BPA durante el proceso de formación embrionaria en un sector de la población de Argentina, es generalizada. En Argentina solo está regulado el uso de este DE en mamaderas.

Discordance of cord insertions as a predictor of discordant fetal growth in monochorionic twins.

INTRODUCTION: The type of cord insertion within monochorionic twin pairs could be different. The purpose of study is to evaluate the association of different combinations of placental umbilical cord insertions with birth weight discordance in a large cohort of monochorionic twins. METHODS: All consecutive monochorionic placentas from either uncomplicated twin pregnancies or with fetal weight discordance examined and injected with color dye at our centers were included in this study (n = 374). Marginal or velamentous cord insertions were defined as abnormal. Placentas were categorized as concordant when the cord insertions of both fetuses were either normal-normal or abnormal-abnormal, and as discordant when they were normal-abnormal. Birth weight discordance was defined as a difference in birth weight of each twin ≥25%. The association of different cord insertion combinations with birth weight discordance was analyzed. RESULTS: The rate of discordant cord insertions was 55% (204/374) in monochorionic twins. A highly significant association between discordant cord insertions and discordant birth weight was observed (p < 0.01). The odds ratios (OR) for birth weight discordance in the discordant cord insertion group compared with the concordant group were 2.3 (95% CI: 1.2-4.4) for the normal-marginal and 5.9 (95% CI: 3.8-10.4) for the normal-velamentous cord insertion subgroup. Discordant cord insertions are associated with the occurrence of unequal placental sharing (OR 4.3, 95%CI 2.7-6.9). DISCUSSION: Discordance of cord insertions is associated with discordance of birth weight and may therefore be an important indicator of adverse outcome in monochorionic twins.