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Introduction: Rhinoviruses (RV) and enteroviruses (EV) are among the main causative etiologies of lower respiratory tract infection (LRTI) in children. The clinical spectrum of RV/EV infection is wide, which could be explained by diverse environmental, pathogen-, and host-related factors. Little is known about the nasopharyngeal microbiota as a risk factor or disease modifier for RV/EV infection in pediatric patients. This study describes distinct nasopharyngeal microbiota profiles according to RV/EV LRTI status in children. Methods: Cross-sectional case-control study, conducted at Hospital Sant de Déu (Barcelona, Spain) from 2017 to 2020. Three groups of children

Introduction: The number of patients with complex chronic conditions (CCC) has increased in the last 20 years or so. There is limited data as regards the prevalence of CCC in the paediatric population and its impact on hospital admissions. The main objectives of this study are to determine the proportion of CCC in the paediatric hospital population and compare them with other groups of patients admitted (acute and chronic). Patients and methods: A descriptive, retrospective study was carried out in a tertiary maternity-paediatric hospital (from December 2016 to November 2017). All patients admitted into the Paediatric Department were recruited with a fortnightly frequency. A series of demographic, clinical, and pregnancy data were collected. In order to identify the level of complexity of the patients, the Clinical Risk Group (CRG) was used, with 3 groups being created: acute, chronic, and CCC. Statistics analysis was performed using SPSS v24. Results: A total of 1433 patients were included. The proportion of CCC on the Paediatric Ward was 14.4%. The CCC were older patients, mainly admitted due to decompensation or progression of their underlying disease, had a longer admission time, and required support in the Paediatric Intensive Care Unit (PICU) more often than that of the other sub-groups. Just under half (44.7%) of the CCC were carriers of a technological device. Of the total of long stays (>1 month), 71.3% had CCC. Conclusions: Patients with CCC require long hospital stays, a greater need of intensive care, and use of technology. New approaches to treatment and follow-up need to be established. They should be cost-effective, and at the same time decrease the impact of the disease on the children and their family. Resumen: Introducción: En las últimas décadas se ha incrementado el número de pacientes crónicos complejos (PCC). Existen pocos datos referentes a la prevalencia de PCC en población pediátrica y su impacto en los ingresos hospitalarios. Los objetivos principales de este trabajo son determinar en nuestro medio la proporción de PCC en hospitalización pediátrica y compararlos con otros grupos de pacientes ingresados (agudos y crónicos). Pacientes y métodos: Estudio descriptivo retrospectivo realizado en un hospital materno-infantil terciario (de diciembre 2016 a noviembre 2017). Se reclutaron a todos los pacientes ingresados en el servicio de Pediatría con una periodicidad quincenal. Se recogieron una serie de variables demográficas, clínicas y de gestión. Para identificar el grado de complejidad de los pacientes se utilizó el sistema de clasificación Clinical Risk Group (CRG) y se crearon 3 grupos: agudos, crónicos y PCC. Para el análisis estadístico se usó SPSS v24. Resultados: Se incluyeron 1.433 pacientes. La proporción de PCC en planta de Pediatría fue del 14,4%. Los PCC fueron pacientes de mayor edad, ingresaron principalmente por descompensación o progresión de su enfermedad de base, estuvieron ingresados más tiempo y precisaron soporte en la Unidad de Cuidados Intensivos Pediátricos (UCIP) con mayor frecuencia que los otros subgupos. Un 44,7% de los PCC era portador de dispositivos tecnológicos. Del total de largas estancias (>1 mes), el 71,3% fue de PCC. Conclusiones: Los PCC requieren de estancias hospitalarias largas, mayor necesidad de cuidados intensivos y uso de tecnología. Es necesario plantear nuevos enfoques de tratamiento y seguimiento que sean costo-eficientes a la vez que disminuyan el impacto de la enfermedad en el niño y su familia.

Resumen: Introducción: En las últimas décadas se ha incrementado el número de pacientes crónicos complejos (PCC). Existen pocos datos referentes a la prevalencia de PCC en población pediátrica y su impacto en los ingresos hospitalarios. Los objetivos principales de este trabajo son determinar en nuestro medio la proporción de PCC en hospitalización pediátrica y compararla con la de otros grupos de pacientes ingresados (agudos y crónicos). Pacientes y métodos: Estudio descriptivo retrospectivo realizado en un hospital materno-infantil terciario (de diciembre de 2016 a noviembre de 2017). Se incluyó a todos los pacientes ingresados en el Servicio de Pediatría con una periodicidad quincenal. Se recogieron una serie de variables demográficas, clínicas y de gestión. Para identificar el grado de complejidad de los pacientes se utilizó el sistema de clasificación Clinical Risk Group (CRG) y se crearon 3 grupos: agudos, crónicos y PCC. Para el análisis estadístico se usó SPSS v24. Resultados: Se incluyó a 1.433 pacientes. La proporción de PCC en la planta de Pediatría fue del 14,4%. Los PCC tenían mayor edad, ingresaron principalmente por descompensación o progresión de su enfermedad de base, estuvieron ingresados más tiempo y precisaron soporte en la Unidad de Cuidados Intensivos Pediátricos con mayor frecuencia que los otros subgupos. Un 44,7% de los PCC era portador de dispositivos tecnológicos. Del total de largas estancias (>1 mes), el 71,3% fue de PCC. Conclusiones: Los PCC requieren de estancias hospitalarias largas, tienen mayor necesidad de cuidados intensivos y uso de tecnología. Es necesario plantear nuevos enfoques de tratamiento y seguimiento que sean costo-eficientes y que, a la vez, disminuyan el impacto de la enfermedad en el niño y su familia. Abstract: Introduction: The number of patients with complex chronic conditions (CCC) has increased in the last 20 years or so. There is limited data as regards the prevalence of CCC in the paediatric population and its impact on hospital admissions. The main objectives of this study are to determine the proportion of CCC in the paediatric hospital population and compare them with other groups of patients admitted (acute and chronic). Patients and methods: A descriptive, retrospective study was carried out in a tertiary maternity-paediatric hospital (from December 2016 to November 2017). All patients admitted into the Paediatric Department were recruited with a fortnightly frequency. A series of demographic, clinical, and pregnancy data were collected. In order to identify the level of complexity of the patients, the Clinical Risk Group (CRG) was used, with 3 groups being created: acute, chronic, and CCC. Statistics analysis was performed using SPSS v24. Results: A total of 1,433 patients were included. The proportion of CCC on the Paediatric Ward was 14.4%. The CCC were older patients, mainly admitted due to decompensation or progression of their underlying disease, had a longer admission time, and required support in the Paediatric Intensive Care Unit more often than that of the other sub-groups. Just under half (44.7%) of the CCC were carriers of a technological device. Of the total of long stays (>1 month), 71.3% had CCC. Conclusions: Patients with CCC require long hospital stays, a greater need of intensive care, and use of technology. New approaches to treatment and follow-up need to be established. They should be cost-effective, and at the same time decrease the impact of the disease on the children and their family.

Background: There is scarce information focused on the effect of weather conditions and air pollution on specific acute viral respiratory infections, such as rhinovirus (RV), with a wide clinical spectrum of severity. Objective: The aim of this study was to analyze the association between episodes of severe respiratory tract infection by RV and air pollutant concentrations (NOx and SO2 ) in the reference area of a pediatric university hospital. Methods: An analysis of temporal series of daily values of NOx and SO2 , weather variables, circulating pollen and mold spores, and daily number of admissions in the pediatric intensive care unit (PICU) with severe respiratory RV infection (RVi) in children between 6 months and 18 years was performed. Lagged variables for 0-5 days were considered. The study spanned from 2010 to 2018. Patients with comorbidities were excluded. Results: One hundred and fifty patients were admitted to the PICU. Median age was 19 months old (interquartile range [IQR]: 11-47). No relationship between RV-PICU admissions and temperature, relative humidity, cumulative rainfall, or wind speed was found. Several logistic regression models with one pollutant and two pollutants were constructed but the best model was that which included average daily NOx concentrations. Average daily NOx concentrations were related with the presence of PICU admissions 3 days later (odds ratio per IQR-unit increase: 1.64, 95% confidence interval: 1.20-2.25)). Conclusions: This study has shown a positive correlation between NOx concentrations at Lag 3 and children's PICU admissions with severe RV respiratory infection. Air pollutant data should be taken into consideration when we try to understand the severity of RVis. This project was partially supported by the Spanish National Health Institute Carlos III (Grant id. PI17/349). Desiree Henares received a grant for predoctoral training in research into Health by the Spanish National Health Institute Carlos III (project number: FI17/00248). The funders have not influenced the design or analysis, nor have they had any role inpreparing the manuscript. Sí

Infection by rhinovirus (RV) and enterovirus (EV) in children ranges from asymptomatic infection to severe lower respiratory tract infection (LRTI). This cohort study evaluates the clinical impact of RV/EV species, alone or in codetection with other viruses, in young children with severe LRTI. Seventy-one patients aged less than 5 years and admitted to the Paediatric Intensive Care Unit (PICU) of a reference children's hospital with RV or EV (RV/EV) LRTI were prospectively included from 1/2018 to 3/2020. A commercial PCR assay for multiple respiratory pathogens was performed in respiratory specimens. In 22/71, RV/EV + respiratory syncytial virus (RSV) was found, and 18/71 had RV/EV + multiple viral detections. Patients with single RV/EV detection required invasive mechanical ventilation (IMV) as frequently as those with RSV codetection, whereas none of those with multiple viral codetections required IMV. Species were determined in 60 samples, 58 being RV. No EV-A, EV-C, or EV-D68 were detected. RV-B and EV-B were only found in patients with other respiratory virus codetections. There were not any associations between RV/EV species and severity outcomes. To conclude, RV/EV detection alone was observed in young children with severe disease, while multiple viral codetections may result in reduced clinical severity. Differences in pathogenicity between RV and EV species could not be drawn. This project is supported by the Spanish National Health Institute Carlos III (Grant id. PI17/349). DH received a grant for predoctoral training in research into Health by the Spanish National Health Institute Carlos III (project number: FI17/00248). DH also received a grant from Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (SEIMC) for a research stay. The funders have not influenced the design or analysis, nor have they had any role in preparing the manuscript. Sí

The use of recruitment maneuvers (RMs) is suggested to improve severe oxygenation failure in patients with acute respiratory distress syndrome (ARDS). Lung ultrasound (LUS) is a non-invasive, safe, and easily repeatable tool. It could be used to monitor the lung recruitment process in real-time. This paper aims to evaluate bedside LUS for assessing PEEP-induced pulmonary reaeration during RMs in pediatric patients. A case of a child with severe ARDS due to Haemophilus influenzae infection is presented. Due to his poor clinical, laboratory, and radiological evolution, he was placed on venovenous extracorporeal membrane oxygenation (ECMO). Despite all measures, severe pulmonary collapse prevented proper improvement. Thus, RMs were indicated, and bedside LUS was successfully used for monitoring and assessing lung recruitment. The initial lung evaluation before the maneuver showed a tissue pattern characterized by a severe loss of lung aeration with dynamic air bronchograms and multiple coalescent B-lines. While raising a PEEP of 30 mmH2O, LUS showed the presence of A-lines, which was considered a predictor of reaeration in response to the recruitment maneuver. The LUS pattern could be used to assess modifications in the lung aeration, evaluate the effectiveness of RMs, and prevent lung overdistension.