RESUMEN

Choline is an essential nutrient for humans and its availability during pregnancy is important for optimal fetal development. The Food and Nutrition Board of the Institute of Medicine in the United States of America has set the adequate choline intake during pregnancy at 450 mg/day. There is limited data available on normal plasma choline concentrations in pregnancy. Moreover, there are neither documented studies of choline intake among pregnant women in the Jamaican population nor of free plasma choline concentrations during pregnancy. Sixteen women presenting to the antenatal clinic of the University Hospital of the West Indies (UHWI) at 10-15 weeks of gestation were selected for this pilot study. A food frequency questionnaire was administered to estimate frequency of consumption of foods rich in choline. Fasting blood samples were collected by venepuncture and plasma assayed for choline using liquid chromatography electrospray ionization isotopic dilution mass spectrometry. Most of the women reported consumption of diets that delivered less than the recommended choline intake (mean +/- SEM, 278.5 +/- 28.9 mg). Mean plasma choline concentration was 8.4 +/- 0.4 micromol/L. This falls below the normal concentration (10 micromol/L) reported for individuals that are not pregnant and pregnant (14.5 micromol/L). The results of this study may be an indication that the choline included in the diet of pregnant women in Jamaica may not be adequate to meet both the needs of the mother and fetus and that further studies are warranted to determine clinical implications.

La colina es un nutriente esencial para los seres humanos y su disponibilidad durante el embarazo es importante para el óptimo desarrollo del feto. La Junta de Alimentos y Nutrición (Food and Nutrition Board) del Instituto de Medicina de los Estados Unidos ha establecido que la ingestión de colina durante el embarazo debe ser 450 mg/día. Los datos disponibles sobre concentraciones de colina en plasma durante el embarazo son limitados. Por otro lado, no existen estudios documentados sobre la ingestión de colina entre las mujeres embarazadas en la población de Jamaica, ni sobre las concentraciones libres de colina en plasma durante el embarazo. Dieciséis mujeres que se presentaron a la clínica de atención prenatal del Hospital Universitario de West Indies entre las 10–15 semanas de gestación, fueron seleccionadas para este estudio piloto. Se aplicó un cuestionario de frecuencia alimentaria a fin de estimar la frecuencia de consumo de alimentos ricos en colina. Se recogieron muestras de sangre en ayunas mediante venopuntura, y se sometió el plasma a análisis en busca de colina, usando la espectrometría de masa de dilución isotópica, ionización por electrospray y cromatografía líquida. La mayoría de las mujeres reportaron consumo de dietas que suministrabanmenos de los niveles de ingestion de colina recomendados (media ± SEM, 278.5 ± 28.9 mg). La concentracion media de colina en plasma fue 8.4 ± 0.4 mmoles/L. Esto se halla por debajo de la concentracion normal (10 mmoles/L) reportado tanto para no embrazadas como para embarazadas (14.5 mmoles/L). Concluimos que los resultados de este estudio pueden ser una indicacion de que los niveles de colina incluidos en la dieta de las mujeres en estado de gestacion en Jamaica no son adecuados para satisfacer las necesidades ni de la madre ni del feto, y que vale la pena la realizacion de estudios ulteriores al objeto de determinar las implicaciones clinicas.

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RESUMEN

Choline is an essential nutrient for humans and its availability during pregnancy is important for optimal fetal development. The Food and Nutrition Board of the Institute of Medicine in the United States of America has set the adequate choline intake during pregnancy at 450 mg/day. There is limited data available on normal plasma choline concentrations in pregnancy. Moreover, there are neither documented studies of choline intake among pregnant women in the Jamaican population nor of free plasma choline concentrations during pregnancy. Sixteen women presenting to the antenatal clinic of the University Hospital of the West Indies (UHWI) at 10-15 weeks of gestation were selected for this pilot study. A food frequency questionnaire was administered to estimate frequency of consumption of foods rich in choline. Fasting blood samples were collected by venepuncture and plasma assayed for choline using liquid chromatography electrospray ionization isotopic dilution mass spectrometry. Most of the women reported consumption of diets that delivered less than the recommended choline intake (mean +/- SEM, 278.5 +/- 28.9 mg). Mean plasma choline concentration was 8.4 +/- 0.4 micromol/L. This falls below the normal concentration (10 micromol/L) reported for individuals that are not pregnant and pregnant (14.5 micromol/L). The results of this study may be an indication that the choline included in the diet of pregnant women in Jamaica may not be adequate to meet both the needs of the mother and fetus and that further studies are warranted to determine clinical implications.

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OBJECTIVE: To document the prevalence of otitis media with effusion (OME) in 102 black children observed prospectively between 6 and 24 months of age. METHODS: Study children attended nine different center-based child care facilities. Middle ear status was assessed by pneumatic otoscopy and tympanometry every 2 weeks. RESULTS: All children, except one, had OME during the period of observation. The proportion of child-examinations revealing bilateral OME ranged from 76% between 6 and 12 months of age to 30% between 21 and 24 months of age. Effusions were considered purulent in only 13% of examinations revealing middle ear fluid. The mean incidence of purulent OME was 2.13 episodes per child per year. Sixty-six children had at least 4 months of continuous bilateral OME during the period of observation; 57 were followed without placement of tympanostomy tubes. Bilateral OME had resolved before the second birthday in 95% of these children, and within 3 months of achieving the 4-month criterion in 50% of subjects. CONCLUSIONS: Persistent bilateral OME occurs commonly between 6 and 18 months of age in infants who enter group child care during the first year of life. In this study, spontaneous resolution of bilateral effusion by 2 years of age was typical.

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The relation of otitis media with effusion (OME) and associated hearing loss to language and cognitive skills at 1 year of age was studied to determine whether OME-related hearing loss had a direct association with language and cognitive outcomes at 1 year of age or an indirect association with these outcomes, as mediated by the child-rearing environment. Subjects were 61 black infants attending community-based child care programs. The presence of OME was assessed biweekly from 6 to 12 months of age by otoscopy and tympanometry. Hearing was assessed with visual reinforcement audiometry when children were well and when ill with OME. Language and cognitive skills and the child-rearing environment at home and in child care were examined. The results indicated a modest correlation between hearing loss associated with OME and receptive language. However, the direct association between OME-related hearing loss and all the language and cognitive measures was negligible. Hearing loss had an indirect association with receptive and expressive language, cognitive development, and overall communication as mediated by child-rearing factors. That is, children with more frequent hearing loss tended to have less responsive mothers and home environments, and this association was linked to lower performance on the infant assessments.

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