Susana Rodríguez

Differential Gender Response to Respiratory Infections and to the Protective Effect of Breast Milk in Preterm Infants

OBJECTIVE. The protective role of breastfeeding against severe acute lung disease in infants is well established, but its mechanism is unclear. Most hypotheses assume that breastfeeding confers similar passive protection to every infant; however, a few observations have suggested that the benefits of breast milk against severe lung disease may differ according to gender. The objective of this study was to determine whether the effect of breastfeeding on susceptibility to severe acute lung disease among infants at high risk is different for girls and boys. METHODS. A cohort was analyzed prospectively by use of 2 different strategies: (1) predictors of first episode of rehospitalization by univariate and multivariate analyses using robust Poisson regression and (2) mean number of rehospitalizations between groups using multiple regression negative binomial models. RESULTS. A total of 119 high-risk, very low birth weight infants were enrolled. Breast milk protected girls but not boys against severe acute lung disease. The interaction between breastfeeding and gender was clinically and statistically significant, even after adjustment for variables that can affect severity of acute lung disease. Disease was most severe in formula-fed girls (versus formula-fed boys). CONCLUSIONS. Breastfeeding decreased the risk for severe acute lung disease in girls but not in boys. These findings suggest that breast milk protection is not universally conferred by passive transfer of humoral immunity (which should be gender indifferent), show that respiratory symptoms may be amenable to nonspecific modulation, and identify nonbreastfed preterm infant girls as an at-risk group for severe acute lung disease.

Intrathoracic Alimentary Tract Duplication Cysts Treated in utero by Thoracoamniotic Shunting

Alimentary tract duplication cysts are rarely diagnosed in utero. We report two fetal patients that presented with intrathoracic alimentary tract duplication cysts, mediastinal shift and hydrops. In one fetus, the cyst continued into the fetal abdomen and pelvis through a left diaphragmatic hernia. Despite successful ultrasound-guided needle aspirations in both fetuses, there was rapid reaccumulation of the fluid and recurrence of the mediastinal shift, prompting the placement of a thoracoamniotic shunt. In one fetus, there was rapid resolution of the mediastinal shift with the disappearance of the hydrops within 2 weeks. The second fetus suffered an intrauterine demise 2 days after the shunt placement. Postnatal resection in the surviving infant revealed a large cyst consistent with an intrathoracic duplication of the stomach. The autopsy of the second fetus revealed an intrathoracic duplication cyst of the stomach and proximal small intestine.

RESPIRATORY SYNCYTIAL VIRUS PROPHYLAXIS IN A HIGH-RISK POPULATION IN ARGENTINA : A COST-EFFECTIVENESS ANALYSIS

Palivizumab has proved effective in reducing hospitalization rates because of respiratory syncytial virus in vulnerable groups. In Argentina its administration is not universal because of high costs. We made a cohort study and enrolled 159 children who met the American Academy of Pediatrics recommendations but did not receive palivizumab; 26% required hospitalization for respiratory syncytial virus infection. Siblings and bronchopulmonary dysplasia were associated with higher hospitalization. For high-risk patients, one averted hospitalization was associated with costs of U.S. dollars (USD)13, 198 [number needed to treat (NNT): 4.5].

Evaluation and clinical application of changes in thyroid hormone and TSH levels in critically ill full-term newborns

Abstract Introduction: The term “euthyroid sick syndrome” (ESS) has been used to describe a pattern of thyroid hormone changes during the course of critical illness in adult patients without thyroid disease, often associated with reduced thyroid hormone secretion. Objective: To describe the thyroid hormone profile in full-term newborns critically ill compared with thyroid hormone profile of healthy infants, and determine if alterations could be related to the severity of the disease and outcome. Methods: A cross-sectional, observational, and prospective study of full-term infants admitted to the neonatal intensive care unit (NICU) of the Hospital de Pediatría J.P. Garrahan between July 2007 and April 2008. Serum T3, T4, and thyroid stimulating hormone (TSH) levels were measured at admission and severity of the disease was evaluated through SNAP, lactic acid, respiratory assistance and number of organs affected. Results: Sick newborns showed significantly lower T3 and T4 levels compared with healthy infants [T3: –0.97 μg/dL (95% CI –0.89, –1.13) and T4: –4.37 μg/dL (95% CI –2.95, –5.78)]. Only 29 out of 94 (31%) infants presented a normal profile; 37 (39%) infants showed isolated low T3 levels, 20 (21%) infants had low T3 and T4 levels and eight (9%) infants had low TSH, T3, and T4. Of this latter group, five of eight (62%) children died suggesting a significantly higher risk of death for patients with low T3 associated with low T4 and TSH [Risk ratio (RR) 10.75 95% CI 3.93, 29]. Conclusions: Full-term sick newborns frequently have lower thyroid hormone levels than healthy ones. These observed thyroid hormones changes might be related to the underlying disease and could be used as a prognostic marker of the severity and fatal outcome of the patient.

Impacto de un programa de prevención de infecciones respiratorias en lactantes prematuros de alto riesgo: estudio prospectivo y multicéntrico

UNLABELLED Respiratory tract infections (RTI), especially those caused by Respiratory Syncytial Virus (RSV), are of central concern in high-risk preterm infant care. Prevention programs including new and costly interventions should be evaluated in terms of effectiveness and impact. OBJECTIVES To evaluate feasibility and results of a National Health Ministry pilot program for severe RTI prevention in high-risk infants. METHODS Seven high-risk follow-up clinics from the public healthcare system were selected for a prospective, multicentric study. Between May and September 2007, a pilot program comprising healthcare team training, parental education, RSV passive immunoprophylaxis, RTI patient care end results evaluation was implemented. Indicators were used to evaluate feasibility; effectiveness was estimated comparing study results with two historical controls. RESULTS 183 infants were incorporated, 5 were lost and 1 died from cardiac disease. A RTI management guideline was elaborated among participating centers; parents assisted to educational workshops; palivizumab was given to participating infants up to three doses. RTI hospital admission rate for the study group was 20% (7% RSV-related), compared to 42% (26% RSV-related) and 37% (29% RSV-related) in control groups (p< 0.0001 and p= 0.02, respectively). CONCLUSIONS Program implementation was feasible and readily accepted by healthcare teams. RTI hospital admissions rates, in general and RSV-related, were significatively lower than local previous studies.

Accesibilidad a una Unidad de Cuidados Intensivos Neonatales de alta complejidad en la Argentina

INTRODUCTION In Argentina information does not exist about how many newborns (NB) who need to be hospitalized in a third level neonatal intensive care unit (NICU) actually accede, not even about the evolution of those who cannot accede. OBJECTIVE To analize the characteristics of NB that required to be hospitalized in a NICU and the evolution of those who do not accede. METHODS Longitudinal, prospective and observational study. There were included NB that required hospitalization in the NICU of the Hospital Garrahan during eleven months. Every request was registered and phone calls were made to know the evolution of rejected NB. The accessibility was analyzed by bivariated and multivariated tests. RESULTS 1197 NB were included in the study; 75% with severe clinical condition, being of higher frequency the cardiac, respiratory and surgical pathologies; 637 NB (53%) were accepted. The NB from other provinces (OR 2, IC95% 1.4-2.8), retinophaty of the premature (OR 40, IC95% 14-85) and surgical disease (OR 1.99, IC95% 1.4-2.7) were independent factors that increased the possibilities to access; it decreased during the winter (OR 0.56, IC95% 0.40-0.77); 56 NB died; 47 could not have access to a third level NICU in spite of presenting pathologies sensitive of treatment. CONCLUSION This information shows the fact that is of high importance to define regional strategies that allow the efficient administration of existing health resources and the opportune access of seriously ill NB patients to reference centers.

Internação devido a infecção pelo vírus sincicial respiratório em pacientes menores de 2 anos com doença cardíaca congênita hemodinamicamente significativa

OBJECTIVE To describe hospitalization rates, burden of disease, and associated risk factors of acute respiratory infections (ARI), particularly those caused by respiratory syncytial virus (RSV) and non-RSV-ARI, in a cohort of patients under 2 years of age with congenital heart disease (CHD). METHODS A prospective, observational cohort study was conducted with CHD patients discharged from the neonatal unit and followed up at a referral center. Demographic variables, type of CHD, and medical needs were recorded. Study primary outcome was hospitalization for ARI (overall, due to RSV, and due to other causes). Secondary outcome was burden of disease in hospitalized patients. Incidence rates of hospitalization were calculated for overall ARI and RSV-ARI. Incidence densities were additionally calculated. RESULTS Seventy-one patients with birth weight 3,043 ± 720 g (mean ± SD) were included; 74% required surgery and 8.4% died of CHD during the study. Overall, 22/71 patients were hospitalized due to ARI (31%; 95%CI 20-43), 15 of them RSV-associated (21%; 95%CI 12-32), and there were 1.35 episodes of hospitalization for ARI/1,000 days of follow-up (0.92 episodes of hospitalization for RSV-ARI/1,000 days). Forty per cent of patients with ARI due to RSV needed admission to pediatric ICU and 30% required mechanical ventilation vs. none in non-RSV-ARI. CONCLUSIONS In the studied population, ARI hospitalization was common, and RSV was its most frequent cause. Disease burden associated with RSV-ARI was considerable, although no patient died from ARI. Except younger age, no other biological or social risk factors were found associated with RSV-ARI hospitalization.

Factores asociados con la aprobación, desarrollo y publicación de proyectos de investigación en un hospital pediátrico

BACKGROUND Unpublished research is a frequent and reported problem. Objective. To analyze factors associated to approval, development and publication of research protocols submitted to Hospital Garrahan Institutional Review Board. METHOD Descriptive and observational study. The characteristics from every protocol submitted to the IRB (January/2001 to June/2006) were collected and a questionnaire was administered in order to explore the accomplishment of the study, meeting presentations, publications or mainspring for not-publication. We calculated OR and 95% CI to estimate what factors were related to the approval and the publication of the studies. RESULTS 190 research protocols were evaluated; 125 (66%) were approved; 84 protocols were carried out (44%) and 40 (21%) were published. The approval was related to basic research (OR 8,6 95%CI 2.3-29) and fellowship participation (OR 9.4 95%CI 4-21.7); although, experimental design (OR 0.76 95%CI 0.61-0.96) and financial support by pharmaceutical industry (OR 0.19 95%CI 0.06-0.60) decreased approval odds. The main cause for not publication was the lack of time for the writing of the article. We have not found factors related to the publication. CONCLUSION From the presentation of a protocol up to its approval and publication there exists barriers that decrease progressively the possibility of completing the research.

Hidrocortisona para el tratamiento de hipotensión refractaria: ensayo clínico controlado y aleatorizado

INTRODUCTION Systemic hypotension is a common sign in critically sick infants. Several studies have suggested that the use of short series of corticosteroids increases arterial blood pressure and reduces the inotropic support needs in preterm neonates with hypotension. There are a small number of reports on the use of hydrocortisone (HC) for the treatment of refractory hypotension in infants. MATERIAL AND METHODS To assess the effectiveness of hydrocortisone in the reduction of inotropic support in infants with refractory hypotension. POPULATION infants who required dopamine ≥ 14 μg/kg/min and/or epinephrine. DESIGN prospective, controlled, randomized, double blind trial with placebo. INTERVENTION HC 2.5mg/kg every 12 hours, for 48 hours intravenously (intervention group [IG]); placebo: isotonic saline 1.25 ml/kg/doses intravenously (placebo group [PG]) every 12 hours, for 48 hours. Randomization was performed in blocks with blind assignment. RESULTS A total of 50 infants with refractory systemic hypotension were prospectively recruited. Patient characteristics were similar in both groups. Requirements for inotropic support at 48 hrs were achieved in 60%, of the IG versus 24% of the PG (P=.009, RR: 2.5, 95% CI, 1.16-5.38). A significant association was observed between the administration of HC in infants treated with epinephrine and the presence of hyperglycemia (P =.008). CONCLUSION In patients with refractory hypotension hydrocortisone administration reduced the need for inotropic support. Further studies with a greater number of patients are needed to confirm the effectiveness of HC as a therapeutic tool in these infants.

Acceso de las familias a las unidades de internación de Neonatología en Iberoamérica: una realidad a mejorar

INTRODUCTION Family access to NICUs has benefits for the newborn (NB) and family, as the main way of humanised care. OBJECTIVE To determine the current state of parents and families access to NICUs in Latin America. METHODS A cross-sectional study was conducted in 15 countries using two questionnaires: 1) directed at head nurses with management and supervision activities, and 2) nurses with care tasks. The features and modes of functioning were examined; the use access guides, personal opinion on the rights to enter, risks, interference, or collaboration as regards the patient, and nursing role in decisions. Nursing leaders of each country identified contacts and obtained authorisation under the regulations of each country. The responses were analysed centrally with the participants remaining anonymous. RESULTS Out of 640 questionnaires issued, responses were received by 226 (35%). Among 52 NICU, 63% have a place for mothers to stay (only 27% overnight), and in 31 (60%) there are notices with fixed schedules for visiting the NB. Unrestricted access exists in only 19 NICU (36%), but for siblings and grandparents it is more restricted (it is not possible in 29%). Among the 174 nurses that responded, 76% feel that mothers should always have access, but these percentages decrease for fathers, siblings and grandparents. A large majority (77%) believe that nursing staff would favour access, and 35% would make it difficult. In addition, 48% believed that access interferes with nursing care. care. CONCLUSION A cultural change is needed in the NICUs in Latin America in order to respect the rights of newborns and their families during hospitalisation.