Antenatal exposure to magnesium sulfate and neonatal outcomes in very low birth weight infants: a multicenter study.

OBJECTIVE: To explore the association between antenatal magnesium sulfate (MgSO4), mortality and incidence of intraventricular hemorrhage (IVH) in very low birth weight (VLBW) infants. STUDY DESIGN: Retrospective, cohort study of infants <32 weeks' GA born at centers of NEOCOSUR Network between January 2015 and December 2020. Subjects were categorized as exposed vs non-exposed to antenatal MgSO4. Primary outcomes were death, incidence of severe IVH (Grade III-IV) and severe IVH/death. Secondary outcomes included relevant morbidities. RESULTS: 7418 VLBW infants were eligible. Antenatal MgSO4 was associated with a significantly decreased death rate after admission (aOR 0.67 [95% CI, 0.49-0.94]) and severe IVH/ death (aOR 0.68 [95% CI, 0.50-0.93]). No significant reduction in severe IVH was observed (aOR 1.11 [95% CI, 0.72-1.71]). No differences between groups were observed in rates of morbidities. CONCLUSION: Antenatal MgSO4 was associated with a decreased death rate after admission and in severe IVH/ death.

Survival of newborn infants with severe respiratory failure before and after establishing an extracorporeal membrane oxygenation program.

BACKGROUND: Severe hypoxic respiratory failure is a leading cause of neonatal mortality in Chile. Extracorporeal membrane oxygenation improves survival in neonates with hypoxic respiratory failure. OBJECTIVE: To determine the impact of the establishment of a Neonatal Extracorporeal Membrane Oxygenation Program on the outcome of newborns with severe hypoxic respiratory failure in a developing country. DESIGN/PATIENTS: Data of newborns (birthweight > 2,000 g and gestational age ≥ 35 wk) with hypoxic respiratory failure and oxygenation index greater than 25 were compared before and after extracorporeal membrane oxygenation was available. Extracorporeal membrane oxygenation was initiated in infants with refractory hypoxic respiratory failure who failed to respond to inhaled nitric oxide/high-frequency oscillatory ventilation. MAIN RESULTS: Data from 259 infants were analyzed; 100 born in the pre-extracorporeal membrane oxygenation period and 159 born after the extracorporeal membrane oxygenation program was established. Patients were similar in terms of risk factors for death for both periods except for a higher oxygenation index and a greater proportion of outborn infants during the extracorporeal membrane oxygenation period. Survival significantly increased from 72% before extracorporeal membrane oxygenation to 89% during the extracorporeal membrane oxygenation period (p < 0.01). During the extracorporeal membrane oxygenation period, 98 of 159 patients (62%) with hypoxic respiratory failure were rescued using inhaled nitric oxide/high-frequency oscillatory ventilation, whereas 61 (38%) did not improve; 52 of these 61 neonates were placed on extracorporeal membrane oxygenation. Extracorporeal membrane oxygenation survival rate to discharge was 85%. After adjusting for potential confounders, the severity of the pretreatment oxygenation index, a late arrival to the referral center, the presence of a pneumothorax, and the diagnosis of a diaphragmatic hernia were significantly associated with the need for extracorporeal membrane oxygenation or death. CONCLUSIONS: The establishment of an extracorporeal membrane oxygenation program was associated with a significant increase in the survival of newborns more than or equal to 35 weeks old with severe hypoxic respiratory failure.

[Pulse Oximetry Values in Preterm infants at 34-36 weeks postmenstrual age]. / Valores de Oximetría de Pulso en Prematuros a las 34-36 semanas post-concepcional.

Pulse oximetry (SpO2) is essential for guiding oxygen therapy in preterm infants. Data on SpO2 values before discharge are limited. OBJECTIVE: To establish SpO2 values in asymptomatic premature infants at 34, 35, and 36 weeks of postmenstrual age (PMA). SUBJECTS AND METHOD: Longitudinal, multicen ter study carried out from May 2018 to May 2019 in three neonatal intensive care units in Santiago, Chile (altitude 579 m) which included premature infants born ≤ 32 weeks of gestational age, healthy, with clinical stability, and without respiratory morbidity at the moment of the study or until dis charge. The following parameters were analyzed: mean accumulated SpO2 and SD, minimum SpO2 value, SpO2 time percentage < 90%, SpO2 time percentage < 80%, DI4, and DI80. Continuous over night SpO2 was obtained with Masimo Radical-7 or Rad-8 (USA), mean artifact-free-recording-time (AFRT) ≥ 6 hours. RESULTS: 101 SpO2 recordings were registered in 44, 33, and 24 studies at 34, 35, and 36 weeks of PMA, respectively, from 62 preterm infants, twenty-eight (45%) were male, median gestational age at birth 30 weeks (range 26-32), and median birth weight 1480 g (range 785-2700g). Oximetry variables were mean AFRT (± SD) 8.6 (± 1.5) hours; median mean SpO2 96.9% (range 93.3-99.3%); median minimum SpO2 74% (range 51-89%); median time of SpO2 < 90% 2% (range 0-10.6%); median time of SpO2 < 80% 0.1% (range 0-1.3%); median desaturation event ≥ 4% (DI4) within ≥ 10 seconds per hour sampled 15 (range 3.5-62.5); and median desaturation event <80% (DI80) 0.58 (range 0-10.8). We found no differences in SpO2 values between the different PMA wee ks. CONCLUSIONS: We described SpO2 values in very preterm infants, asymptomatic at 34-36 PMA weeks. These values could be used as a reference for guiding oxygen therapy.

[Current status of Therapeutic Hypothermia in Hypoxic-Ischemic Encephalopathy]. / Estado actual de la Hipotermia Terapéutica en la Encefalopatía Hipóxico-Isquémica.

Therapeutic hypothermia (TH) has been the standard treatment for neonatal Hypoxic-Ischemic En cephalopathy (HIE) for more than a decade. This therapy has been one of the best studied treatments in neonatal medicine, moving from preclinical models to patient application. Its implementation has been accompanied by the development of neuromonitoring, neonatal neurology as a specific area of expertise, and the intense search for new neuroprotective strategies. This article provides an update on the clinical scope of this therapy, with emphasis on the problems of our geographic region. In addition, some additional strategies that can improve the therapeutic efficacy of TH are reviewed, as well as controversial aspects in its application and some future perspectives in the care of neonates with HIE.

Improvement of survival in infants with congenital diaphragmatic hernia in recent years: effect of ECMO availability and associated factors.

BACKGROUND/PURPOSE: Survival of patients with congenital diaphragmatic hernia (CDH) depends both on non-modifiable congenital conditions and on modifiable pre and postnatal management. ECMO improves survival up to 80% in neonates with CDH in the best ECMO centers worldwide. The first Neonatal ECMO Program in Chile was started in our University in 2003. Our objective is to determine the impact of a Neonatal ECMO Program in a level III NICU on newborns with CDH. METHODS: Data of all newborns with CDH admitted to our NICU was separated into two groups: pre ECMO (1996-2003) and ECMO (2003-2007). Crude and adjusted odds ratios for 24 months survival were estimated by logistic regression. RESULTS: Data of 46 newborns with CDH was analysed, 20 in the pre ECMO and 26 in the ECMO period. Patient characteristics were similar in both groups; however, 24-month survival increased significantly from 25% (5/20) in the pre ECMO period to 77% (20/26) in the ECMO period (P = 0.001). Adjusted odds ratios for 24-month survival were 26.98 for OI or= 7 and 17.5 for ECMO availability. CONCLUSIONS: The establishment of an ECMO program was associated with a significant increase in long-term survival for infants with CDH.

Clinical utility of early amplitude integrated EEG in monitoring term newborns at risk of neurological injury.

OBJECTIVE: to test the clinical utility of an early amplitude-integrated electroencephalography (aEEG) to predict short-term neurological outcome in term newborns at risk of neurology injury. METHODS: this was a prospective, descriptive study. The inclusion criteria were neonatal encephalopathy, neurologic disturbances, and severe respiratory distress syndrome. Sensitivity, specificity, positive and negative predictive values, and likelihood ratio (LR) were calculated. Clinical and demographic data were analyzed. Neurological outcome was defined as the sum of clinical, electroimaging, and neuroimaging findings. RESULTS: ten of the 21 monitored infants (48%) presented altered short-term neurologic outcome. The aEEG had 90% sensitivity, 82% specificity, 82% positive predictive value, and 90% negative predictive value. The positive LR was 4.95, and the negative LR was 0.12. In three of 12 (25%) encephalopathic infants, the aEEG allowed for a better definition of the severity of their condition. Seizures were detected in eight infants (38%), all subclinical at baseline, and none had a normal aEEG background pattern. The status of three infants (43%) evolved and required two or more drugs for treatment. CONCLUSIONS: in infants with encephalopathy or other severe illness, aEEG disturbances occur frequently. aEEG provided a better classification of the severity of encephalopathy, detected early subclinical seizures, and allowed for monitoring of the response to treatment. aEEG was a useful tool at the neonatal intensive care unit for predicting poor short-term neurological outcomes for all sick newborn.

Analysis of a learning assessment system for pediatric internship based upon objective structured clinical examination, clinical practice observation and written examination.

OBJECTIVE: To describe and analyze three tools used in the assessment system applied to the pediatric internship over a 7-year period at the School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile. METHODS: Retrospective observational research design for the assessment modalities implemented in the pediatric internship from 2001 through 2007. The tools were as follows: objective structured clinical examination (OSCE), written examination and daily clinical practice observation guidelines (DCPOG). The assessment methods were applied to the sixth-year pediatric internship with a total of 697 students. Statistical analysis included a descriptive assessment, with correlation and simple linear and multiple regressions (ANOVA), Bonferroni test and Cronbach's alpha coefficient. Significance level was set at p < 0.05. RESULTS: OSCE success scores were reached in 75.7+/-8%, with a better mean among females (p < 0.001). OSCE scores improved after the third year of implementation. Cronbach's alpha coefficient was 0.11-0.78. Written examination had a mean score of 79.8+/-10% and there were no sex differences. Mean DCPOG score was 97.1+/-3% and the results were better among females (p < 0.005). Correlation between the three assessment methods showed a moderate positive relationship except in the year of 2007, where the correlation was higher (p < 0.001). CONCLUSIONS: Analysis of the learning assessment system was performed using OSCE, written examination and DCPOG, which are complementary to each other, and yielded good results.

Clinical utility of early amplitude integrated EEG in monitoring term newborns at risk of neurological injury / Utilidade clínica de um monitoramento por EEG de amplitude integrada precoce em recém-nascidos a termo com risco de lesão neurológica

OBJECTIVE: to test the clinical utility of an early amplitude-integrated electroencephalography (aEEG) to predict short-term neurological outcome in term newborns at risk of neurology injury. METHODS: this was a prospective, descriptive study. The inclusion criteria were neonatal encephalopathy, neurologic disturbances, and severe respiratory distress syndrome. Sensitivity, specificity, positive and negative predictive values, and likelihood ratio (LR) were calculated. Clinical and demographic data were analyzed. Neurological outcome was defined as the sum of clinical, electroimaging, and neuroimaging findings. RESULTS: ten of the 21 monitored infants (48%) presented altered short-term neurologic outcome. The aEEG had 90% sensitivity, 82% specificity, 82% positive predictive value, and 90% negative predictive value. The positive LR was 4.95, and the negative LR was 0.12. In three of 12 (25%) encephalopathic infants, the aEEG allowed for a better definition of the severity of their condition. Seizures were detected in eight infants (38%), all subclinical at baseline, and none had a normal aEEG background pattern. The status of three infants (43%) evolved and required two or more drugs for treatment. CONCLUSIONS: in infants with encephalopathy or other severe illness, aEEG disturbances occur frequently. aEEG provided a better classification of the severity of encephalopathy, detected early subclinical seizures, and allowed for monitoring of the response to treatment. aEEG was a useful tool at the neonatal intensive care unit for predicting poor short-term neurological outcomes for all sick newborn. .

OBJETIVO: testar a utilidade clínica do aEEG precoce em recém-nascidos a termo com risco delesão neurológica, para prever resultados neurológicos de curto prazo. MÉTODOS: estudo prospectivo e descritivo. Os critérios de inclusão foram encefalopatia neonatal, distúrbios neurológicos e bebês com SARA grave. Sensibilidade, especificidade, valor preditivo positivo e negativo e razão de verossimilhança foram calculados. Dados clínicos edemográficos foram analisados. O resultado neurológico foi definido como a soma de conclusões clínicas, de eletro e de neuroimagem. RESULTADOS: dentre os 21 neonatos monitorados, dez (48%) apresentaram resultado neurológico de curto prazo alterado. O aEEG apresentou sensibilidade de 90%, especificidade de 82%, valor preditivo positivo de 82% e valor preditivo negativo de 90%. A VR positiva foi de 4,95, e a RV negativa de 0,12. Em três dos 12 (25%) neonatos com encefalopatia foi possível definir melhora gravidade de sua condição pelo aEEG. Foram detectadas convulsões em oito neonatos (38%), todas subclínicas no início do estudo, e nenhum apresentou um padrão histórico normal no aEEG. O estado de três neonatos (43%) evoluiu e exigiu dois ou mais medicamentos para tratamento. CONCLUSÕES: em neonatos com encefalopatia ou outra doença grave, os distúrbios no aEEGocorrem com mais frequência. O aEEG forneceu uma classificação melhor da gravidade da encefalopatia, detectou convulsões subclínicas precoces e permitiu que fosse feito o monitoramento da resposta ao tratamento. O aEEG é uma ferramenta útil para prever resultados neurológicos de curto prazo em todos os bebês doentes na UTIN. .

Análise de um sistema de avaliação de aprendizagem para internato em pediatria baseado em exame clínico objetivo estruturado, observação de prática clínica e exame escrito / Analysis of a learning assessment system for pediatric internship based upon objective structured clinical examination, clinical practice observation and written examination

OBJETIVO: Descrever e analisar três ferramentas usadas no sistema de avaliação aplicado ao internato em pediatria por um período de 7 anos na Faculdade de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile. MÉTODOS: Pesquisa observacional retrospectiva projetada para as modalidades de avaliação usadas de 2001 a 2007 que foram implementadas no internato em pediatria. As ferramentas foram as seguintes: exame clínico objetivo estruturado (objective structured clinical examination, OSCE), exame escrito e diretrizes de observação de prática clínica diária (DOPCD). Os métodos de avaliação foram aplicados ao internato em pediatria do sexto ano, com um total de 697 alunos. A análise estatística incluiu uma avaliação descritiva, com correlação e regressões linear simples e múltipla (ANOVA), teste de Bonferroni e coeficiente alfa de Cronbach. O nível de significância foi de 5 por cento. RESULTADOS: Escores de sucesso com a OSCE foram atingidos em 75,7±8 por cento, com melhor média entre o sexo feminino (p < 0,001). Os escores de OSCE melhoraram após o terceiro ano de implementação. O coeficiente alfa de Cronbach foi de 0,11-0,78. O exame escrito teve escore médio de 79,8±10 por cento, e não houve diferenças quanto a gênero. O escore médio de DOPCD 97,1±3 por cento, com melhores resultados entre as mulheres (p < 0,005). A correlação entre os três métodos de avaliação mostrou uma relação positiva moderada, exceto no ano de 2007, quando a correlação foi maior (p < 0,001). CONCLUSÕES: Análise do sistema de avaliação da aprendizagem foi realizada usando OSCE, exame escrito e DOPCD, que são complementares entre si, gerando bons resultados.

OBJECTIVE: To describe and analyze three tools used in the assessment system applied to the pediatric internship over a 7-year period at the School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile. METHODS: Retrospective observational research design for the assessment modalities implemented in the pediatric internship from 2001 through 2007. The tools were as follows: objective structured clinical examination (OSCE), written examination and daily clinical practice observation guidelines (DCPOG). The assessment methods were applied to the sixth-year pediatric internship with a total of 697 students. Statistical analysis included a descriptive assessment, with correlation and simple linear and multiple regressions (ANOVA), Bonferroni test and Cronbach's alpha coefficient. Significance level was set at p < 0.05. RESULTS: OSCE success scores were reached in 75.7±8 percent, with a better mean among females (p < 0.001). OSCE scores improved after the third year of implementation. Cronbach's alpha coefficient was 0.11-0.78. Written examination had a mean score of 79.8±10 percent and there were no sex differences. Mean DCPOG score was 97.1±3 percent and the results were better among females (p < 0.005). Correlation between the three assessment methods showed a moderate positive relationship except in the year of 2007, where the correlation was higher (p < 0.001). CONCLUSIONS: Analysis of the learning assessment system was performed using OSCE, written examination and DCPOG, which are complementary to each other, and yielded good results.