Early high amino-acid intake is associated with hypophosphatemia in preterm infants.

OBJECTIVE: To estimate the incidence of hypophosphatemia in preterm infants according to parenteral nutrition received and to evaluate associated risk factors. DESIGN: A prospective multicenter cohort study included 111 patients ≤ 1250 g (7 NICUs of the NEOCOSUR Network). Two groups were compared according to the amino-acid supply in the first 48 h: aggressive parenteral group ≥ 3 g/kg/day and standard parenteral group: <2.9 g/kg/day. Hypophosphatemia was defined as serum phosphate < 4 mg/dl. A logistic regression analysis was performed to evaluate associated risk factors. RESULTS: Fifty-eight infants received aggressive parenteral nutrition. The incidence of hypophosphatemia was significantly higher in the aggressive parenteral group (77.5% vs 53.8%, p = 0.009). Hypophosphatemia was independently associated with aggressive parenteral nutrition (aOR 4.16 95% CI 1.54-12.24) and negatively associated with phosphorous intake (aOR 0.92 95% CI 0.87-0.97). CONCLUSION: Both high amino-acid intake and low phosphorus supply during the first days after birth were independently associated with hypophosphatemia.

COVID-19 preparedness-a survey among neonatal care providers in low- and middle-income countries.

OBJECTIVE: To evaluate COVID-19 pandemic preparedness, available resources, and guidelines for neonatal care delivery among neonatal health care providers in low- and middle-income countries (LMICs) across all continents. STUDY DESIGN: Cross-sectional, web-based survey administered between May and June, 2020. RESULTS: Of 189 invited participants in 69 LMICs, we received 145 (77%) responses from 58 (84%) countries. The pandemic provides significant challenges to neonatal care, particularly in low-income countries. Respondents noted exacerbations of preexisting shortages in staffing, equipment, and isolation capabilities. In Sub-Saharan Africa, 9/35 (26%) respondents noted increased mortality in non-COVID-19-infected infants. Clinical practices on cord clamping, isolation, and breastfeeding varied widely, often not in line with World Health Organization guidelines. Most respondents noted family access restrictions, and limited shared decision-making. CONCLUSIONS: Many LMICs face an exacerbation of preexisting resource challenges for neonatal care during the pandemic. Variable approaches to care delivery and deviations from guidelines provide opportunities for international collaborative improvement.

Cuantificación de Bisfenol-A libre en sangre de cordón umbilical humano a nivel de trazas / Quantification of free Bisphenol-A in human umbilical cord blood at trace level / Quantificação de Bisfenol-A livre em sangue de cordão umbilical humano a nível de traços

El Bisfenol-A (BPA) es ampliamente utilizado en la producción de plásticos de policarbonato, por lo que está presente en productos de uso masivo. Es un disruptor endócrino e incide en el desarrollo gonadal y del sistema nervioso central. La exposición de mujeres embarazadas al BPA es particularmente preocupante para el feto en desarrollo, debido a que atraviesa la placenta pasando a la sangre de cordón y al líquido amniótico. Esto se suma a la escasa o nula actividad enzimática fetal para biotransformarlo en BPA-glucurónido inactivo, causando posibles efectos nocivos a la descendencia a dosis muy bajas y sostenidas. Con el propósito de estudiar la exposición al BPA y sus efectos en la población de Argentina se desarrolló y validó un método analítico por cromatografía líquida acoplada a espectrometría de masa, que permite la cuantificación de trazas de BPA libre (forma estrogénica, activa) en plasma de cordón umbilical. La técnica consiste en la precipitación de proteínas de la sangre de cordón por agregado de acetonitrilo y posterior centrifugado e inyección del sobrenadante. Se utilizó una elución isocrática en la cromatografía líquida, y la espectrometría de masa se realizó empleando Electrospray negativo en modo de monitoreo de reacciones múltiples. Los valores de BPA libre cuantificados están en el rango de 1,0 a 12,1 ng/mL, límite de detección: 0,6 ng/mL.

Bisphenol-A (BPA) is widely used in the production of polycarbonate plastics and therefore, it is present in products of massive use. It is known as an endocrine disruptor and has an impact on gonadal and central nervous system development. Exposure of pregnant women to BPA is particularly worrying for the developing fetus because it crosses the placenta into the cord blood and amniotic fluid, coupled with little or no fetal enzymatic activity to biotransform it into inactive BPA-glucuronide, causing possible harmful effects to the offspring at very low and sustained doses. With the aim to study the exposure to BPA and its effects on the population of Argentina, an analytical method was developed and validated by liquid chromatography coupled to mass spectrometry, which allows the quantification of trace amounts of free BPA (estrogenic, active form) in plasma of umbilical cord. The method involves protein precipitation by the addition of acetonitrile and subsequent centrifugation and injection of supernatant. An isocratic elution was used in liquid chromatography, and mass spectrometry was performed using negative Electrospray mode in multiple reaction monitoring. Quantified free BPA values are in the range of 1.0 to 12.1 ng/mL, Detection Limit: 0,6 ng/mL.

O Bisfenol-A (BPA) é amplamente utilizado na produção de plásticos de policarbonato, portanto está presente em produtos de uso massiço. Ele é um disruptor endócrino e tem um impacto no desenvolvimento gonadal e do sistema nervoso central. A exposição de mulheres grávidas ao BPA é particularmente preocupante para o feto em desenvolvimento, visto que atravessa a placenta passando ao sangue do cordão e ao líquido amniótico Isso é adicionado à pouca ou nula atividade enzimática fetal para biotransformá-lo em BPA-glicuronídeo inativo, o que causa possíveis efeitos nocivos aos descendentes em doses muito baixas e sustentadas. Visando a estudar a exposição ao BPA e seus efeitos na população da Argentina, foi desenvolvido e validado um método analítico por cromatografia líquida acoplada à espectrometria de massa, que permitem a quantificação de vestígios de BPA livre (forma estrogênica, livre) em plasma do cordão umbilical. A técnica consiste na precipitação de proteínas do sangue de cordão por adição de acetonitrila e posterior centrifugação e injeção no sobrenadante. Na cromatografia líquida, foi utilizada uma eluição isocrática, e a espectrometria de massa foi realizada utilizando Electrospray negativo em modo de monitoramento de reações múltiplas. Os valores de BPA livre quantificados estão na faixa de 1,0 a 12,1 ng/mL, limite de detecção: 0,6 ng/mL.

Open lung strategy in a lamb model of respiratory distress syndrome.

We tested the hypothesis that an open lung strategy with recruitment maneuvers will improve oxygenation and decrease lung injury in comparison with a permissive hypercapnia strategy in preterm lambs. Preterm lambs born by operative delivery at 131 ± 1 days of gestational age (term = 150 days) were randomized to an open lung group (OLG, n = 5) or a permissive hypercapnia group (PHG, n = 4). In the OLG, ramp recruitment maneuvers were performed by increasing and then decreasing peak inspiratory pressure and positive end-expiratory pressure (adjusting for expiratory tidal volume [V(T)] 6 to 8 mL/kg). In the PHG, lambs received ventilation with V(T) of 6 to 8 mL/kg, adapting pressures and respiratory rate according to arterial blood gases results. Fraction of inspired oxygen was adjusted for oxygen saturation 88 to 93%. Lambs were ventilated for 6 hours. Lung pathology was assessed by masked examiners. There were no significant differences for arterial to alveolar oxygen tension ratio, partial pressure of arterial carbon dioxide, blood pressure, compliance, resistance, and other variables between groups. Gas leaks were noted in four of five lambs in the OLG and one of four in the PHG (relative risk 3.2; 95% confidence interval 0.5 to 18). By histological examination, lung areas were overdistended (49% in the OLG, 37% in the PHG). Open lung ventilation following ramp recruitment maneuvers did not offer advantages and might increase lung injury compared with a permissive hypercapnia strategy in preterm lambs with lung immaturity.