Resumen: El Pediatric Index of Mortality 3 (PIM3) es una escala que estima el riesgo de mortalidad en niños ingresados a Unidad de Cuidado Intensivo Pediátrico (UCIP) en la primera hora del ingreso. Objetivo: validar la escala PIM3 en población pediátrica que ingresa a UCIP en alturas sobre los 2.500 metros sobre el nivel del mar (m.s.n.m.), y evaluar si el lactato y el índice Saturación de Oxígeno/Fracción inspirada de oxígeno (SpO2/FiO2) mejoran su capacidad de predicción de mortalidad. Pacientes y Método: Estudio prospectivo multicéntrico realizado en diez UCIP de Colombia entre noviembre de 2016 y junio de 2017. Se recolectaron variables para cálculo del PIM3, lactato sérico y el índice SpO2/FiO2. Se validó su capacidad de discriminación con el área bajo la curva ROC y la calibración mediante la prueba de bondad de ajuste de Hosmer Lemeshow. Resultados: Se incluyeron 2.803 registros de admisiones, con una mortalidad global de 4,8%, y razón estandarizada de mortalidad de 1,1 (IC95%; 1,00-1,3). El PIM3 mostró una baja calibración (p < 0,001) y una adecuada discriminación para la población aplicada (ROC 0,84; IC95% 0,83-0,86). La adición de lactato sérico y SpO2/ FiO2 permitieron una buena calibración (p = 0,75), y mantuvo una alta discriminación de mortalidad (ROC 0,86; IC95% 0,84-0,87). Conclusiones: El comportamiento de la escala PIM3 tiene adecuada discriminación, pero una baja calibración en niños admitidos a UCIP sobre los 2500 m.s.n.m.. Las variables lactato y SpO2/FiO2 mejoraron su habilidad predictiva.

Abstract: The Pediatric Index of Mortality 3 (PIM3) is a scale that estimates the risk of mortality in children admitted to the Pediatric Intensive Care Unit (PICU) within the first hour of admission. Objective: to validate the PIM3 scale in pediatric population admitted to PICU at altitudes over 2,500 meters above sea level (m.a.s.l.), and to evaluate whether lactate and the oxygen saturation/fraction of inspired oxygen (SpO2/FiO2) index improve its ability to predict mortality. Patients and Method: A prospective multicenter study was carried out in 10 PICUs in Colombia between November 2016 and June 2017. Variables were collected for the calculation of PIM3, serum lactate, and SpO2/FiO2 index. Their discrimination capacity was validated with the area under the ROC curve and calibration using the Hosmer Lemeshow goodness-of-fit test. Results: 2,803 admissions were included, with an overall mortality of 4.8% and a standardized mortality ratio of 1.1 (95%CI 1.00-1.3). PIM3 showed low calibration (p < 0.001) and adequate discrimination for the studied population (ROC 0.84; 95%CI 0.83-0.86). The addition of serum lactate and SpO2/FiO2 allowed a good calibration (p = 0.75) and maintained a high discrimination of mortality (ROC 0.86; 95%CI 0.84-0.87). Conclusions: The performance of the PIM3 scale has adequate discrimination, but low calibration in children admitted to PICU at above 2500 m. a. s. l. Lactate and SpO2/FiO2 variables improved its predictive ability.

Abstract: The Pediatric Index of Mortality 3 (PIM3) is a scale that estimates the risk of mortality in children admitted to the Pediatric Intensive Care Unit (PICU) within the first hour of admission. Objective: to validate the PIM3 scale in pediatric population admitted to PICU at altitudes over 2,500 meters above sea level (m.a.s.l.), and to evaluate whether lactate and the oxygen saturation/fraction of inspired oxygen (SpO2/FiO2) index improve its ability to predict mortality. Patients and Method: A prospective multicenter study was carried out in 10 PICUs in Colombia between November 2016 and June 2017. Variables were collected for the calculation of PIM3, serum lactate, and SpO2/FiO2 index. Their discrimination capacity was validated with the area under the ROC curve and calibration using the Hosmer Lemeshow goodness-of-fit test. Results: 2,803 admissions were included, with an overall mortality of 4.8% and a standardized mortality ratio of 1.1 (95%CI 1.00-1.3). PIM3 showed low calibration (p < 0.001) and adequate discrimination for the studied population (ROC 0.84; 95%CI 0.83-0.86). The addition of serum lactate and SpO2/FiO2 allowed a good calibration (p = 0.75) and maintained a high discrimination of mortality (ROC 0.86; 95%CI 0.84-0.87). Conclusions: The performance of the PIM3 scale has adequate discrimination, but low calibration in children admitted to PICU at above 2500 m. a. s. l. Lactate and SpO2/FiO2 variables improved its predictive ability.

Resumen: El Pediatric Index of Mortality 3 (PIM3) es una escala que estima el riesgo de mortalidad en niños ingresados a Unidad de Cuidado Intensivo Pediátrico (UCIP) en la primera hora del ingreso. Objetivo: validar la escala PIM3 en población pediátrica que ingresa a UCIP en alturas sobre los 2.500 metros sobre el nivel del mar (m.s.n.m.), y evaluar si el lactato y el índice Saturación de Oxígeno/Fracción inspirada de oxígeno (SpO2/FiO2) mejoran su capacidad de predicción de mortalidad. Pacientes y Método: Estudio prospectivo multicéntrico realizado en diez UCIP de Colombia entre noviembre de 2016 y junio de 2017. Se recolectaron variables para cálculo del PIM3, lactato sérico y el índice SpO2/FiO2. Se validó su capacidad de discriminación con el área bajo la curva ROC y la calibración mediante la prueba de bondad de ajuste de Hosmer Lemeshow. Resultados: Se incluyeron 2.803 registros de admisiones, con una mortalidad global de 4,8%, y razón estandarizada de mortalidad de 1,1 (IC95%; 1,00-1,3). El PIM3 mostró una baja calibración (p < 0,001) y una adecuada discriminación para la población aplicada (ROC 0,84; IC95% 0,83-0,86). La adición de lactato sérico y SpO2/ FiO2 permitieron una buena calibración (p = 0,75), y mantuvo una alta discriminación de mortalidad (ROC 0,86; IC95% 0,84-0,87). Conclusiones: El comportamiento de la escala PIM3 tiene adecuada discriminación, pero una baja calibración en niños admitidos a UCIP sobre los 2500 m.s.n.m.. Las variables lactato y SpO2/FiO2 mejoraron su habilidad predictiva.

RESUMO INTRODUÇÃO: Quase 73% da população chilena estão infectadas pelo Helicobacter pylori (H. pylori), fator predisponente ao câncer gástrico. Estudos recentes demonstraram a presença desse patógeno em leveduras, sugerindo que esse fato pode influenciar diretamente a falha de um tratamento, transmissão e reinfecção. OBJETIVO: Detectar a presença de H. pylori em leveduras orais isoladas de estudantes da Universidade de Concepción (Chile). MÉTODOS: 72 amostras, obtidas da cavidade oral utilizando cotonetes, foram incubadas em caldo YPD por 48h a 37°C e posteriormente sementes em ágar Sabouraud Dextrose mais cloranfenicol na mesma temperatura e ao mesmo tempo. Leveduras isoladas foram observadas microscopicamente (montagem úmida e corada por Gram) e identificadas utilizando técnicas microbiológicas. A detecção intracelular de H. pylori foi realizada pela amplificação do 16S rDNA por PCR. RESULTADOS: Leveduras orais foram detectadas em 24 amostras (33,3%), sendo C. albicans (79,2%), a espécie mais frequente seguida por C. dubliniensis (12,4%), C. krusei (4,2%) e C. tropicalis (4,2 %) Quando analisadas por PCR, 15 das 24 leveduras orais 62,5% foram positivas para o H. pylori 16S rDNA. Dos 15 indivíduos positivos para leveduras que abrigam H. pylori, 81% deles relataram desconforto estomacal e a presença da bactéria foi diagnosticada em algum momento em 20% deles. CONCLUSÃO: A presença intracelular do H. pylori em leveduras orais sugere uma relação endossimbiótica desses microrganismos, o que poderia favorecer a transmissão e a reinfecção do H. pylori no trato gastrointestinal.

SUMMARY INTRODUCTION: Nearly 73% of the Chilean population is infected with Helicobacter pylori (H. pylori), a factor predisposing for gastric cancer. Recent studies have demonstrated the presence of this pathogen within yeasts, suggesting that this fact can directly influence the failure of a treatment, transmission, and reinfection. AIM: To detect the presence of H. pylori inside oral yeasts isolated from students of the University of Concepción (Chile). METHODS: 72 samples, obtained from the oral cavity using cotton swabs were incubated in YPD broth for 48h at 37°C and posteriorly seeded in Sabouraud Dextrose agar plus chloramphenicol at the same temperature and for the same time. Yeasts isolated were observed microscopically (wet mounting and Gram-stained) and identified using microbiological techniques. Intracellular H. pylori detection was performed by the amplification of 16S rDNA by PCR. RESULTS: Oral yeasts were detected in 24 samples (33.3%), being C. albicans (79.2%) the most frequent species, followed by C. dubliniensis (12.4%), C. krusei (4.2%), and C. tropicalis (4.2%). When analyzed by PCR, 15 of the 24 oral yeasts 62.5 % were positive for H. pylori 16S rDNA. From the 15 individuals positive for yeast harboring H. pylori, 81% of them reported stomach discomfort, and the presence of the bacteria was diagnosed at some moment in 20% of them. CONCLUSION: The intracellular presence of the H. pylori in oral yeasts suggests an endosymbiotic relationship of these microorganisms, which could favor H. pylori transmission and reinfection in the gastrointestinal tract.