Canalización del crecimiento entre los 2 y los 5 años en niños aparentemente sanos con talla baja a los 2 años / Canalization of growth between 2 and 5 years of age in apparently healthy children with short stature at age 2 years

Introducción. El tamaño del recién nacido se asocia a condiciones intrauterinas. El potencial genético se expresa más tarde; la canalización del crecimiento se describe clásicamente hasta los 24 meses. Objetivo. Describir la canalización del crecimiento entre los 2 y los 5 años en niños aparentemente sanos con talla baja a los 2 años. Población y métodos. Estudio de cohorte retrospectiva. Se incluyeron niños seguidos en un hospital universitario de comunidad entre 2003 y 2019, con puntaje Z de talla menor a -2 DE para edad y sexo a los 2 años. Se excluyeron los nacidos prematuros, con bajo peso y con enfermedades crónicas. Se evaluó la trayectoria de crecimiento. Se definió canalización como la adquisición de talla normal para la población general. Resultados. Se incluyeron 64 niños, de los cuales 37 (58 %) presentaron canalización del crecimiento a los 5 años (20 a los 3 años, 8 a los 4 años, y 9 a los 5 años). La velocidad de crecimiento a los 3 y a los 5 años fue significativamente mayor en los que canalizaron en comparación con los que no lo hicieron; hubo una tendencia similar a los 4 años. De los 27 niños con talla baja a los 5 años, 25 tuvieron al menos un registro de velocidad de crecimiento anual menor al percentil 25. Conclusiones. La mayoría de los niños aparentemente sanos con baja talla a los 2 años alcanzan una talla normal a los 5 años. La velocidad de crecimiento anual permite detectar a los niños con riesgo de no canalizar.

Introduction. Newborn size is associated with intrauterine conditions. Genetic potential is expressed later; the canalization of growth is typically described up to 24 months of age. Objective. To describe the canalization of growth between 2 and 5 years of age in apparently healthy children with short stature at age 2 years. Population and methods. Retrospective, cohort study. Children seen at a community teaching hospital between 2003 and 2019, who had a Z-score for height below -2 SDs for age and sex at age 2 years were included. Infants born preterm, with a low birth weight, and chronic conditions were excluded. Growth patterns were assessed. Canalization was defined as reaching a normal stature for the general population. Results. Sixty-four children were included; 37 (58%) showed canalization of growth at 5 years old (20 at 3 years, 8 at 4 years, and 9 at 5 years). The growth rate at 3 and 5 years of age was significantly higher among those who showed canalization compared to those who did not; a similar trend was observed at 4 years of age. Among 27 children with short stature at 5 years of age, 25 had at least 1 annual growth velocity below the 25th centile. Conclusions. Most apparently healthy children with short stature at 2 years old reached a normal stature at 5 years old. The annual growth velocity allows to detect children at risk of not showing canalization.

Diferencias de sexo en la canalización del crecimiento y del desarrollo infantil: un ejemplo de regulación genética / Sex differences in the canalization of child growth and development: An example of genetic regulation

Ante una enfermedad o carencia nutricional, la curva de crecimiento puede desviarse del percentil que recorría, y cuando el daño es neutralizado, hay una fuerza regulatoria que tiende a restaurar su trayectoria. Este fenómeno, llamado crecimiento compensatorio o catch-up, es un ejemplo de canalización del crecimiento. Las niñas se ven favorecidas respecto de los niños porque, ante un mismo daño, su crecimiento (y también su desarrollo psicomotor) se desvía menos que el de los niños. Esta diferencia también se expresa en una mayor prevalencia masculina de retraso del desarrollo en general y de algunos trastornos del desarrollo, como trastorno del espectro autista y parálisis cerebral, entre otros. La mortalidad infantil es menor en niñas a todas las edades y la esperanza de vida es varios años mayor en mujeres en todos los países. La causa de estas diferencias a favor de las niñas tiene un fuerte componente genético y enriquece la interpretación de estudios clínicos y epidemiológico

In case of a disease or nutritional deficit, the growth curve may show deviations from the percentile it was depicting, and once damage is removed, a strong regulatory force tends to restore its path. Such phenomenon is known as catch-up growth and is an example of canalization of growth. Girls are more favored than boys because, when faced with the same damage, their growth (and also their psychomotor development) shows less deviation than that of boys. Such difference is also shown in a higher prevalence among boys of growth retardation in general and some developmental disorders, including autism spectrum disorder and cerebral palsy. Infant mortality is lower in girls at all ages and life expectancy is several years longer in women from all countries. The cause of such differences in favor of girls has a strong genetic component and is enriching for the interpretation of clinical and epidemiological studies.

La arquitectura genética como herramienta de análisis del mapa genotipo-fenotipo / Genetic architecture as an analysis tool of the genotype-phenotype map

El estudio de la relación entre el genotipo y el fenotipo es de gran importancia para las investigaciones en genética y en las ciencias de la vida en general. A diferencia de la concepción tradicional de esta relación como un conjunto invariante de parámetros, el enfoque actual utiliza la arquitectura genética, una herramienta realista y dinámica que permite elucidar el mapa genotipo-fenotipo, ahora considerado una estructura en evolución. De las complejas relaciones entre los elementos del mapa genotipo-fenotipo surgen diversas propiedades emergentes que pueden explicar distintos fenómenos evolutivos. Además, algunas de estas propiedades promueven la acumulación de variabilidad genética en poblaciones naturales, la cual constituye el sustrato de procesos evolutivos como la selección natural. La caracterización y análisis de la arquitectura genética de caracteres adaptativos constituye una herramienta eficaz para comprender los procesos genéticos subyacentes al cambio evolutivo.

Studying the relationship between genotype and phenotype is of great importance for genetics and life science studies in general. In contrast with the traditional view of this relationship as an invariant set of parameters, the current approach incorporates the concept of genetic architecture, a realistic and dynamic tool that allows to elucidate the genotype-phenotype map, which is now regarded as an evolving structure. From the complex relationships between the elements in the genotype-phenotype map several emergent properties arise that can explain different evolutionary phenomena. Moreover, some of these properties promote the accumulation of genetic variability in natural populations, which constitutes the substrate to evolutionary processes such as natural selection. The characterization and analysis of the genetic architecture of adaptive traits constitutes a powerful tool to understand the genetics underpinnings of evolution.

Relationship Between ABO Blood Type and Spontaneous Re-canalization in Patients With Acute Myocardial Infarction / 中国循环杂志

Objective: To study the relationship between ABO blood type and spontaneous re-canalization (SR) in patients with acute myocardial infarction (AMI). Methods: A total of 1209 consecutive AMI patients were enrolled. Based on TIMI grade, the patients were divided into 2 groups: Non-SR group, the patients with TIMI grade 0-1,n=442 and SR group, the patients with TIMI grade 2-3,n=767. The relationship between ABO blood type and SR was investigated. Results: Compared with Non-SR group, SR group had more patients with blood type O (32.3% vs 24.7%) and less blood type A (31.7% vs 24.9%). Meanwhile, we found that a lower cholesterol level was related to patients with O blood type and SR occurrence, bothP<0.05. Multi regression analysis indicated that with adjusted age, gender, BMI, hypertension, diabetes, smoking, LDL-C and C-reactive protein, ESR, fibrinogen, D-dimmer, endothelial cardiac function, blood type O may independently predict SR occurrence in AMI patients (OR=1.49, 95% CI 1.10-2.05), while blood type A may have disadvantage for SR (OR=0.65, 95% CI 0.48-0.80). Conclusion: ABO blood type has been related to SR in AMI patients, blood type O is in favor of SR, while blood type A has disadvantage for SR occurrence.

Evolución clínica y ultrasonográfica del síndrome postrombótico en su primer año de evolución / Clinical and ultrasonographic progression of posthrombotic syndrome in its first year

Introduccións: La insuficiencia venosa crónica es característica principal del síndrome postrombótico donde el estasis venoso es típico. Objetivos: Describir la evolución clínica y ultrasonográfica del síndrome postrombótico durante su primer año. Métodos: Estudio descriptivo prospectivo en 20 hombres (55,6 por ciento) y 16 mujeres (44,4 por ciento) con una edad promedio de 55,8 ± 14,2 años (IC95 por ciento : 41,6 ­ 70 años), ingresados en el Servicio de Flebolinfología del Instituto Nacional de Angiología y Cirugía Vascular con el diagnóstico de trombosis venosa profunda de los miembros inferiores. Las variables estudiadas fueron: tipos de síntomas clínicos, tipo de evolución ultrasonográfica por ecodoppler, estadios clínicos del síndrome postrombótico, tiempo y porcentaje de recanalización. Resultadoss: A los seis meses de evolución predominó la sintomatología severa (47,2 por ciento); en el sector fémoro­poplíteo la clasificación de buena. Al año, fue más frecuente la clasificación de moderada (52,8 por ciento) y de muy buena en el sector poplíteo; el edema pretibial fue el signo que predominó. En los sectores ocluidos fémoro-poplíteo el porcentaje de recanalización promedio aumentó al año y fue superior (p < 0,05) al obtenido a los seis meses. Se encontró asociación significativa entre el porcentaje de recanalización y el período de evolución (X2= 41,41; p= 0,0000); y entre el estadio clínico y el porcentaje de recanalización (X2= 32,95; p= 0,0000). Conclusións: durante el primer año de presentarse el síndrome postrombótico pueden ocurrir cambios clínicos y evolución favorable en la recanalización del sistema venoso profundo(AU)

Introduction: Chronic venous insufficiency is the main characteristic of the posthrombotic syndrome where the vein stasis is typical. Objective: to describe the clinical and ultrasonographic progression of the post-thrombotic syndrome in its first year. Methods: A descriptive prospective study was conducted in 20 men (55.6 percent) and 16 women (44.4 percent), with average age of 55.8 ± 14.2 years (IC95 percent : 41.6 ­ 70 years) diagnosed as deep venous thrombosis of the lower limb patients and hospitalized in the phlebolymphology service of the National Institute of Angiology and Vascular Surgery. The studied variables were types of clinical symptoms, type of ultrasonographic progression using Echodoppler device, clinical stagings of the posthrombotic syndrome, and time and percentage of re-canalization. Results: After six months of progression, severe symptoms predominated (47.2 percent); and in the femoral-popliteal area the classification was good. After a year, the moderate classification was more frequent (52.8 percent) and extremely good in the popliteal sector; the pretibial edema was the predominant sign (50 percent). In the occluded popliteal-femoral sector, the percentage of average re-canalization increased after a year, being higher (p< 0.05) than that of six months. A significant association was found between the percentage of re-channeling and the period of progression (X2= 41.41; p= 0.0000); and between the clinical staging and the percentage of re-canalization (X2= 32.95, p= 0.0000). Conclusions: During the first year of existence of the posthrombotic syndrome, clinical changes and favorable progression may occur in the re-canalization of the deep venous system(AU)

Desiccation stress induces developmental heterochrony in Drosophila melanogaster.

Stressful environments are known to perturb developmental patterns in insects. In the purview of desiccation as a stressor, relatively little is known about the developmental consequences linked with desiccation tolerance. In this study, we have particularly focused on the exploration of the temporal profile of postembryonic development in response to desiccation exposure in Drosophila melanogaster and the associated trade-offs. We document a correlation between variations in 20-hydroxyecdysone levels and the altered timing of metamorphic events during the life cycle. Following desiccation, we observed an extension in the larval longevity whereas the duration of the pupal and adult stages was significantly shortened. Alternately, feeding of 20-hydroxyecdysone apparently led to the restoration of the normal temporal pattern of development in the desiccated group. In spite of the desiccation-responsive heterochronic shifts in development, the overall lifespan post recovery remained almost unaltered among the desiccated and undesiccated groups suggesting plasticity in developmental control. This observation reminisces ‘canalization-like’ phenomenon that buffers alterations in the overall lifespan. We thus identified a desiccationresponsive period in the lifespan of D. melanogaster during which variations in ecdysone levels are capable to alter the temporal course of development.

Ontogenia y fisoonomía del paisaje epigenético:un modelo general para explicarr sistemas en desarroloo / Ontogeny and Physiognomy of the Epigenetic Landscape: A General Model to Explain Developmental Systems

El paisaje epigenético es una metáfora gráfica propuesta por Conrad H. Waddington para explicar el desarrollo de los organismos mediante la imagen de un paisaje compuesto por una superficie ondulante con cimas y valles, que representan las vías por las cuales se desplazan las células del organismo en su proceso de diferenciación. C.H. Waddington, considerado como el padre de la epigenética, es notable por sus aportes teóricos, que incluyen las nociones de asimilación genética, la canalización del desarrollo y el epigenotipo. Estas ideas surgieron a partir de estudios experimentales en biología del desarrollo, los cuales resultaron en el descubrimiento del "organizador" en embriones de aves y, posteriormente, de fenocopias inducidas por factores ambientales en Drosophila. En el presente artículo se presenta una interpretación del paisaje epigenético y conceptos relacionados, que ponen en evidencia el poder heurístico de este modelo y su importancia para la biología contemporánea. Este trabajo es un homenaje a la vida de C. H. Waddington, cuya obra continúa siendo de gran actualidad.

The epigenetic landscape is a graphic metaphor proposed by Conrad H. Waddington to explain the development of organisms and their parts. It is depicted as a wavy surface with summits and descending valleys, representing the paths followed by cells along their differentiation process, as part of organismal development. Conrad H. Waddington, regarded as the father of epigenetics, stands out for his theoretical contributions, that include the notions of genetic assimilation, canalization of development and epigenotype. These ideas were inspired by experimental works in developmental biology, that lead to the discovery of the organizer in bird embryos, as well as environmentallyinduced phenocopies in Drosophila. In the current essay, I present an interpretation of the epigenetic landscape and related concepts that highlight the heuristic power of this model and its importance for contemporary biology. This work is a tribute to the life of C. H. Waddington, whose work is still of great significance.

Efectividad del alcohol absoluto para canalizar los tumores irrresecables de esófago / Effectiveness of absolute alcohol to canalize the esophageal non-resectable tumors

INTRODUCCIÓN. En más del 75 por ciento de los pacientes con cáncer de esófago, los procedimientos que se realizan son paliativos y existe un dilema ético sobre la forma de solucionar el problema fundamental: la alimentación. El objetivo de esta investigación fue señalar la importancia de las infiltraciones con alcohol absoluto para lograr la implantación de prótesis esofágicas artesanales por el método de tracción. MÉTODOS. Se realizó un estudio prospectivo y lineal con pacientes con cáncer de esófago irresecable, ingresados entre 1995 y 2009. Fueron evaluados 112 pacientes, de los cuales 65 fueron tratados con métodos paliativos. Se colocaron 55 prótesis esofágicas y en 10 de estos casos fue necesario canalizar previamente el tumor con infiltraciones de alcohol absoluto. RESULTADOS. Se consiguió pasar la sonda nasogástrica en el 90 por ciento de los pacientes que necesitaron infiltraciones de alcohol absoluto. Fueron necesarias entre 1 y 2 sesiones, pero uno de los pacientes necesitó 3 sesiones de infiltración. No hubo complicaciones. CONCLUSIONES. La combinación de alcohol absoluto y prótesis permite eliminar la disfagia en el cáncer avanzado de esófago y cardias. Cuando existe estenosis total, el alcohol absoluto es un método adecuado para canalizar la estenosis tumoral de esófago antes de colocar la prótesis. En la mayoría de los casos son suficientes 1 o 2 sesiones de infiltración(AU)

INTRODUCTION. In more than 75 percent of patients presenting with esophageal cancer the procedures performed are of type palliative and there is a ethical dilemma on the way to solve the major problem: the feeding. The objective of present paper was to emphasize the significance of infiltrations with absolute alcohol to achieve the implantation of handmade esophageal prostheses using the traction method. METHODS. A linear and prospective study was performed in patients presenting with non-resectable esophageal cancer admitted between 1995 and 2009. A total of 112 patients were assessed with 65 of them treated using palliative methods. Fifty five esophageal prostheses were placed and in 10 of these cases it was necessary to tunnelled previously the tumor with absolute alcohol infiltrations. RESULTS.The nasogastric tube was passed in the 90 percent of patients needing infiltrations of absolute alcohol. One or two sessions were necessary but one of them need three sessions of infiltrations without complications. CONCLUSIONS.The combination of absolute alcohol and prosthesis allows to eliminate the dysphagia in cases of advanced cancer and cardias. When there is a total stenosis, the absolute alcohol is a appropriate method to canalize the esophageal tumoral stenosis before to place the prosthesis. In most of cases are enough 1 or 2 sessions of infiltrations(AU)

Analysis of the factors affecting successful reopening of occluded subclavian artery / 介入放射学杂志

Objective To evaluate the factors which might affect the successful reopening of occluded subclavian artery. Methods During the period of Jan. 1998-March 2007, endovascular stent placement was performed in 20 patients with occluded subclavian artery, including 12 males and 8 females, aged 17-74 years (mean 53 years). The procedures were carried out by using super-slippery guide wire via anterograde or bilateral access. Results Successful reopening of occluded subclavian artery was obtained in 14 cases and the treatment ended in failure in 6 cases. In 14 patients with successful results, the mean length of diseased artery was 3.00 cm and the mean course of disease was 9.83 months, which were 2.13 cm and 27.6 months respectively in 6 cases of failure. The successful reopening rate was 80% in arthrosclerosis cases, while it was 50% in aorto-arteritis obliterans. The successful reopening rate was 100% in those cases whose occluded artery showing a sharp stump, while the successful reopening rate was 33% in those cases whose occluded artery showing a round stump, with a statistically significant difference between the two (P< 0.05). The successful rate in cases performed via anterograde access was 65%, and it was only 43% in cases performed via bilateral access. Conclusion The etiology, the duration of disease and the shape of stump bear a close relationship to the successful reopening rate, while no obvious correlation exists between the length of diseased artery and the reopening rate. Higher reopening rate can be achieved when the procedure is performed via anterograde access.

Comprehensive rehabilitation of closed injury of brain / 中国组织工程研究

Objective To observe the effect of physical factors and promotion canalization on closed injury of brain.Method 68 cases of closed injury of brain were given the comprehensive rehabilitation therapy with many physical factors and promoting canalization technique.Result The patients' consciousnesses were significantly improved after treatment.The motorial function of hemiplegic limbs was distinctly improved(P< 0.05).The balance functions were distinctly improved(P< 0.001).The activities of daily living abilities were significantly improved(P< 0.05).Conclusion The physical factors and promoting canalization treatment on the closed injury of brain are functionally effective.