Malnutrición en una población de escolares en Santiago, República Dominicana / Malnutrition of an elementary school population in Santiago, Dominican Republic

Introducción: la malnutrición infantil representa uno de los problemas de salud pública más importantes de la República Dominicana (RD) y el mundo. A pesar de esto, actualmente, no existen estudios en la RD que describa el estado nutricional en los niños de la escuela primaria. Material y métodos: este estudio transversal describió las principales variables antropométricas en niños de 1ero a 6to de primaria en Santiago, RD, además de determinar la relación existente entre la antropometría y variables sociodemográficas. Resultados: de los 2,271 estudiantes estudiados, la media del peso fue 33,2 ± 11,4 kg, la talla fue 1,36 ± 0,13 m. La media del percentil fue 65,33 %. El 3.92 % (n=89) estuvo en bajo peso, el 17.57 % (n=399) estuvo en sobrepeso y el 22.94 % (n=521) estuvo en obesidad. Conclusión: el sobrepeso y la obesidad infantil fueron los trastornos más comunes en zonas rurales y urbanas, y tanto en centros privados como públicos

Introduction: Child malnutrition represents one of the most important public health issues in the Dominican Republic (DR) and the whole world. Despite this reality, there are currently no studies in the DR that describe the nutritional status in primary school children. Material and method: This cross-sectional study described the main anthropometric variables in children from elementary schools in Santiago, RD, in addition to determining the relationship between anthropometry status and some sociodemographic variables. Results: 2,271 participants were analyzed; the mean weight was 33.2 ± 11.4 kg, height was 1.36 ± 0.13 m. The mean percentile was 65.33%. 3.92% (n=89) were underweight, 17.57% (n=399) were overweight, and 22.94% (n=521) were obese. Conclusion: Childhood overweight and obesity was the most prevalent disorder, both in rural and urban areas, and both in private and public centers

Electronic Computer-Based Model of Combined Ventilation Using a New Medical Device

IntroductionThe increased demand for mechanical ventilation caused by the SARS-CoV-2 pandemic could generate a critical situation where patients may lose access to mechanical ventilators. Combined ventilation, in which two patients are ventilated simultaneously but independently with a single ventilator has been proposed as a life-saving bridge while waiting for new ventilators availability. New devices have emerged to facilitate this task and allow individualization of ventilatory parameters in combined ventilation. In this work we run computer-based electrical simulations of combined ventilation. We introduce an electrical model of a proposed mechanical device which is designed to individualize ventilatory parameters, and tested it under different circumstances. Materials and MethodsWith an electronic circuit simulator applet, an electrical model of combined ventilation is created using resistor-capacitor circuits. A device is added to the electrical model which is capable of individualizing the ventilatory parameters of two patients connected to the same ventilator. Through computational simulation, the model is tested in different scenarios with the aim of achieving adequate ventilation of two subjects under different circumstances: 1) two identical subjects; 2) two subjects wiIth the same size but different lung compliance; and 3) two subjects with different sizes and compliances. The goal is to achieve the established charge per unit of size on each capacitor under different levels of end-expiratory voltage (as an end-expiratory pressure analog). Data collected included capacitor charge, voltage, and charge normalized to the weight of the simulated patient. ResultsSimulations show that it is possible to provide the proper charge to each capacitor under different circumstances using an array of electrical components as equivalents to a proposed mechanical device for combined ventilation. If the pair of connected capacitors have different capacitances, adjustments must be made to the source voltage and/or the resistance of the device to provide the appropriate charge for each capacitor under initial conditions. In pressure control simulation, increasing the end-expiratory voltage on one capacitor requires increasing the source voltage and the device resistance associated with the other simulated patient. On the other hand, in the volume control simulation, it is only required to intervene in the device resistance. ConclusionsUnder simulated conditions, this electrical model allows individualization of combined mechanical ventilation.

Procederes de regresión lineal como soluciones al problema de la comparación de métodos: II Errores analíticos constantes pero diferentes / Procedures of linear regression as solutions to the problem of the methods comparison: II Constant analythical errors but differents

En este trabajo se discute el desempeño de cuatro solucionesdel problema de comparación de métodos: regresión de mínimoscuadrados ordinarios (P1), regresión de Passing-Bablok(P2), regresión de Deming con coeficiente λ estimado apartir de las varianzas intrarreplicados (P3) y regresión deDeming con coeficiente λ estimado a partir de las varianzasde las series (P4), cuando los errores analíticos correspondientespueden asumirse constantes, en el rango de concentracionesde interés, pero diferentes. El caso de los erroresanalíticos constantes e iguales se presentó en otro trabajo...(AU)