Plasma cytokine levels fall in preterm newborn infants on nasal CPAP with early respiratory distress

Introduction Early nCPAP seems to prevent ventilator-induced lung injury in humans, although the pathophysiological mechanisms underlying this beneficial effect have not been clarified yet. Objective To evaluate plasma levels IL-1β, IL-6, IL-8, IL-10, and TNF-α immediately before the start of nCPAP and 2 hours later in preterm infants. Methods Prospective cohort including preterm infants with 28 to 35 weeks gestational age with moderate respiratory distress requiring nCPAP. Extreme preemies, newborns with malformations, congenital infections, sepsis, surfactant treatment, and receiving ventilatory support in the delivery room were excluded. Blood samples were collected right before and 2 hours after the start of nCPAP. Results 23 preterm infants (birth weight 1851±403 grams; GA 32.3±1.7 weeks) were treated with nCPAP. IL-1β, IL-10, TNF-α levels were similar, IL-8 levels were reduced in 18/23 preterm infants and a significant decrease in IL-6 levels was observed after 2 hours of nCPAP. All newborns whosemothers received antenatal steroids had lower cytokine levels at the onset of nCPAP than those whosemothers didn’t receive it; this effect was not sustained after 2 hours of nCPAP. Conclusion Early use nCPAP is not associated with rising of plasma pro-inflammatory cytokines and it seems to be a less harmful respiratory strategy for preterm with moderate respiratory distress

Preterm neonates with respiratory distress syndrome : ventilator-induced lung injury and oxidative stress

Ventilator-induced lung injury is well recognized, and appropriate arterial saturation target is unknown, so gentle modes of ventilation and minimizing oxidative stress have been well studied. Our objective was to analyze any association between the oxygen levels at blood sampling and plasma levels of the interleukins IL-6, IL-1β, IL-10, and IL-8 and TNF-α in preterm newborns under mechanical ventilation (MV) in their first two days. Methods. Prospective cohort including neonates with severe respiratory distress. Blood samples were collected right before and 2 hours after invasive MV. For analysis purposes, newborns were separated according to oxygen requirement: low oxygen (≤30%) and high oxygen (>30%) groups. Interleukins were measured using a commercially available kit. Results. 20 neonates (gestational age 32.2 ± 3 weeks) were evaluated. Median O2 saturation levels pre-MV were not different in both oxygen groups. In the high oxygen group, IL-6, IL-8, and TNF-α plasma levels increased significantly after two hours under MV. Conclusions. Despite the small sample studied, data showed that there is a relationship between VILI, proinflammatory cytokines, and oxygen-induced lung injury, but a study considering oxidative marker measurements is needed. It seems that less oxygen may keep safer saturation targets playing a less harmful role

Newborn Screening for Congenital Infectious Diseases

To estimate the prevalence of congenital toxoplasmosis, Chagas disease, cytomegalovirus, and rubella, blood samples on dried blood spot (DBS) from neonates (day 3–20 of life) were screened for immunoglobulin (Ig) M against Toxoplasma gondii, cytomegalovirus, rubella virus, and IgG against Trypanosoma cruzi by methods used for serum and adapted for use with DBS. Positive samples were further analyzed for IgM and IgG in serum from neonates and mothers. DBS samples from 364,130 neonates were tested for Toxoplasma gondii–specific IgM, and 15,873 neonates were also tested for IgM against cytomegalovirus and rubella virus and for Trypanosoma cruzi–specific IgG. A total of 195 were diagnosed with congenital toxoplasmosis, 16 with cytomegalovirus, and 11 with congenital rubella. One newborn had a confirmed result for Chagas disease, and 21 mothers had positive serum antibodies. These results suggest that infectious diseases should be considered for future inclusion in programs for newborn screening of metabolic diseases in disease-endemic areas

Estimation of the regional distribution of congenital toxoplasmosis in Brazil from the results of neonatal screening

AIMS: To determine the prevalence of congenital toxoplasmosis in Brazil from samples of dried blood on filter paper from neonates attended by a private program of neonatal screening. METHODS: Blood samples collected from neonates by puncturing the heel and dried on filter paper, received from all Brazilian states from September 1995 to July 2009, were tested for Toxoplasma gondii-specific IgM antibodies. For each positive screening test, confirmatory tests were performed in sera of mothers and newborns, obtained by venipuncture. The infants were monitored and classified as infected according to one of the following criteria: presence of Toxoplasma gondii specific IgM and IgG in the newborn and the mother; Toxoplasma gondii-specific IgM and IgG in the newborn only; Toxoplasma gondii-specific IgM and IgG in the mother only; or increasing amount of Toxoplasma gondii-specific IgG in the infant. RESULTS: A total of 800,164 blood samples were tested. The overall prevalence of congenital toxoplasmosis was found to be 1/1,613 (6/10,000) in the country, ranging from 1/5,447 to 1/495 (2/10,000 to 20/10,000) in different states. CONCLUSIONS: Neonatal screening on a large scale is an important tool for determining the prevalence of congenital toxoplasmosis. The high prevalence of the infection in Brazil and the wide variability of its epidemiology among the states support the need to develop policies on health and education to prevent and control congenital toxoplasmosis across the country, respecting the peculiarities of each state.OBJETIVO: estimar a prevalência da toxoplasmose congênita Brasil por meio de amostras de sangue seco em papel filtro, obtidas de neonatos atendidos por um programa privado de triagem neonatal. MÉTODOS: amostras de sangue coletadas de neonatos por punção de calcâneo e absorvidas em papel filtro, recebidas de todos os estados brasileiros entre setembro de 1995 e julho de 2009, foram testadas para anticorpos IgM anti-Toxoplasma gondii. Para cada teste positivo na triagem, foram realizados exames confirmatórios em soros das mães e dos neonatos, obtidos por punção venosa periférica. Os casos foram considerados confirmados de acordo com um dos seguintes critérios: presença de IgM e IgG anti-Toxoplasma gondii no neonato e na mãe; IgM e IgG anti-Toxoplasma gondii somente no neonato; IgM e IgG anti-Toxoplasma gondii somente na mãe; ou aumento progressivo dos anticorpos IgG anti-Toxoplasma gondii no lactente. RESULTADOS: foram testadas 800.164 amostras. Observou-se uma prevalência geral de toxoplasmose congênita no país de 1/1.613, variando de 1/1.547 a 1/495 (2/10.000 to 20/10.000) em diferentes estados. CONCLUSÕES: a triagem neonatal em larga escala é uma ferramenta importante para a determinação da prevalência da toxoplasmose congênita. A alta prevalência dessa infecção no Brasil e a ampla variabilidade de sua epidemiologia entre os estados confirmam a necessidade de políticas de saúde e educação voltadas à prevenção e ao controle da toxoplasmose congênita em todo o país, respeitando as peculiaridades de cada estado

Neonatal screening for four lysosomal storage diseases with a digital microfluidics platform: initial results in Brazil

We describe the initial results of a neonatal screening program for four lysosomal storage diseases (MPS I, Pompe, Gaucher and Fabry) using the digital microfluidics methodology. The method successfully identified patients previously diagnosed with these diseases and was used to test dried blood spot samples obtained from 10,527 newborns aged 2 to 14 days. The digital microfluidic technology shows potential for a simple, rapid and high-throughput screening for these four diseases in a standard neonatal screening laboratory

Plasma cytokine levels fall in preterm newborn infants on nasal CPAP with early respiratory distress.

Early nCPAP seems to prevent ventilator-induced lung injury in humans, although the pathophysiological mechanisms underlying this beneficial effect have not been clarified yet.To evaluate plasma levels IL-1β, IL-6, IL-8, IL-10, and TNF-α immediately before the start of nCPAP and 2 hours later in preterm infants.Prospective cohort including preterm infants with 28 to 35 weeks gestational age with moderate respiratory distress requiring nCPAP. Extreme preemies, newborns with malformations, congenital infections, sepsis, surfactant treatment, and receiving ventilatory support in the delivery room were excluded. Blood samples were collected right before and 2 hours after the start of nCPAP.23 preterm infants (birth weight 1851±403 grams; GA 32.3±1.7 weeks) were treated with nCPAP. IL-1β, IL-10, TNF-α levels were similar, IL-8 levels were reduced in 18/23 preterm infants and a significant decrease in IL-6 levels was observed after 2 hours of nCPAP. All newborns whose mothers received antenatal steroids had lower cytokine levels at the onset of nCPAP than those whose mothers didn't receive it; this effect was not sustained after 2 hours of nCPAP.Early use nCPAP is not associated with rising of plasma pro-inflammatory cytokines and it seems to be a less harmful respiratory strategy for preterm with moderate respiratory distress