Resumen El presente estudio tuvo como objetivo conocer la estructura factorial de la escala de mantenimiento en las relaciones de pareja en hombres y mujeres. Participaron de manera voluntaria y confidencial 731 personas (49.8% hombres y 50.2% mujeres). Se elaboró una escala con 178 reactivos, para evaluar el mantenimiento de las relaciones de pareja con base en un estudio exploratorio, con un formato de respuesta tipo Likert de 5 puntos. Esta consta de cuatro subescalas: Significado (46 reactivos y 6 factores), Motivos (30 reactivos y cuatro factores), Estrategias (46 reactivos y 6 factores) y Consecuencias (56 reactivos y 4 factores). Para cada subescala se obtuvo el análisis psicométrico. Los resultados indican una escala valida y confiable en sus cuatro subescalas, a través de análisis factoriales exploratorios y análisis de consistencia interna. Los hallazgos permiten contar con un instrumento robusto que permite evaluar en sus diferentes subescalas las áreas que componen el mantenimiento en la pareja, esto con la finalidad de realizar evaluaciones en las relaciones diádicas que fomenten parejas saludables, así como intervenciones, basadas en esta primera aproximación.

Abstract The purpose of this research was to obtain the factor structure of the Couple Relationship Maintenance Scale using a Mexican sample of men and women. A total of 731 voluntary people (49.8% men, 50.2% women) were part of this study and agreed to do so confidentially. Based on results from an exploratory study, the scale was initially developed considering 178 items in order to assess maintenance of couple relationships with a 5-point Likert response style. The scale was divided into four subscales: Meaning (46 items, 6 factors), Motives (30 items, 4 factors), Strategies (46 items, 6 factors), and Consequences (56 items, 4 factors). Each subscale required its own psychometric analysis. Exploratory factor analysis and internal consistency analysis show a valid and reliable scale in all four subscales. These findings allow for a robust scale that allows the evaluation of maintenance throughout several of its components. The development of instruments like the one presented becomes fundamental in the evaluation of dyadic relationships that in turn develop healthy couple relationships, as well as evidence-based interventions.

This article details the experimental and numerical results on the energy absorption performance of square tubular profile with circular discontinuities drilled at lengthwise in the structure. A straight profile pattern was utilized to compare the absorption of energy between the ones with discontinuities under quasi-static loads. The collapse mode and energy absorption conditions were modified by circular holes. The holes were drilled symmetrically in two walls and located in three different positions along of profile length. The results showed a better performance on energy absorption for the circular discontinuities located in middle height. With respect to a profile without holes, a maximum increase of 7% in energy absorption capacity was obtained experimentally. Also, the numerical simulation confirmed that the implementation of circular discontinuities can reduce the peak load (Pmax) by 10%. A present analysis has been conducted to compare numerical results obtained by means of the finite element method with the experimental data captured by using the testing machine. Finally the discrete model of the tube with and without geometrical discontinuities presents very good agreements with the experimental results.

La interpretación inicial del proceso de coagulación mencionaba la presencia de 2 vías: la extrínseca, formada por el factor tisular (FT) y el factor VII, y la intrínseca, en la que participan los factores XII, XI, IX, VIII y V. Hoy en día este concepto ha cambiado y se acepta de forma categórica que el evento iniciador principal de la coagulación sanguínea es la exposición del FT. En este artículo revisamos los nuevos conceptos de la cascada de coagulación con los hallazgos de la tromboelastografía y los diferentes mecanismos que precipitan la coagulopatía asociada al trauma. Para tal fin se realizó una búsqueda sistemática en las principales bases de datos, como Medline, Embase y Lilacs, en el periodo comprendido entre 2000 y 2011. Se encontraron 114 artículos, de los cuales se tomaron 50 para realizar la revisión. Como hallazgo relevante se encontró que la tromboelastografía permite detectar con precisión el defecto subyacente en la cascada de coagulación, y de esta manera se ha convertido en una herramienta útil e indispensable para guiar el manejo de la coagulopatía asociada al trauma.

Initial interpretation of the process of coagulation refers to two pathways: (1) the extrinsic pathway, consisting of tissue factor (TF) and factor VII, and (2) the intrinsic pathway, in which factors XII, XI, IX, VIII and V are involved. Currently, this concept has changed and it is accepted that the main initiating event in blood coagulation is TF exposure. In this article, we review the new concepts of the coagulation cascade based on thromboelastography findings and the different mechanisms involved in trauma-associated coagulopathy. For this purpose, a systematic research was carried out using the main databases, including Medline, Embase and Lilacs between 2000 and 2011. One hundred and fourteen articles were found, and 50 were selected for the review. A relevant finding was that thromboelastography allows a precise detection of the underlying flaw in the coagulation cascade. Therefore, this procedure has become an essential tool and a guide for the management of trauma-associated coagulopathy.