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La hemorragia es un trastorno caracterizado por la extravasación de sangre del lecho vascular y no siempre se produce por la misma causa, localización o intensidad. Las hemorragias obstétricas incluyen las hemorragias anteparto y posparto y son una causa importante de morbimortalidad neonatal y materna. Como parte de los esfuerzos realizados en la materia, es importante llevar a cabo estudios constantes que permitan mantener conocimientos actualizados según las características propias de cada población, por tal motivo se justifica y expone la investigación cualitativa de tipo bibliográfica. Como criterio de selección se utiliza el análisis y síntesis de la información recolectada mostrando en la investigación la información actualizada y pertinente que responde a los objetivos planteados. Durante las primeras 20 semanas de embarazo, las mujeres experimentan sangrado vaginal. La cantidad de sangrado puede variar desde unos pocos puntos esporádicos hasta una gran cantidad de sangre. Las hemorragias postparto son mas frecuentes que las anteriores a él. El derramamiento de grandes cantidades de sangre siempre es motivo de preocupación que puede resultar en aborto espontáneo o pueden surgir problemas más adelante en el embarazo En cualquiera de los casos es importante que los médicos pregunten sobre los síntomas y la historia clínica.

Leer y escribir son herramientas de trabajo de los profesionales en las comunidades letradas en las que vivimos. Este estudio evalúa el nivel de comprensión lectora (CL) que tienen estudiantes de educación superior próximos a egresar. La muestra fue conformada por alumnos de varias universidades públicas del estado de Sonora en México. Se diseñó un instrumento ex profeso para verificar si existen diferencias según el campo disciplinar o área de conocimiento a la que pertenecen. En el análisis se utilizaron los programas SPSS y Nvivo. Los hallazgos ponen de manifiesto la necesidad de potenciar aún más la comprensión lectora y se destaca como influencia significativa el área de conocimiento, donde los estudiantes de Ciencias de la Salud muestran mejores niveles de CL en relación a los jóvenes de otras áreas estudiadas. Se observa la importancia que tiene para ello el conocimiento del lenguaje en las prácticas de lectura.

Este estudio, de tipo descriptivo transversal, presenta un análisis estadístico comparativo que se realizó con estudiantes de último año del área administrativa en tres universidades mexicanas. El objetivo de la investigación fue comprobar las competencias profesionales que desarrolló el estudiantado según perfil de egreso y modalidad aplicada (presencial, mixta o virtual), para diferenciar las competencias que fortalecen su perfil de egreso y cuáles deben ser potenciadas. El instrumento empleado para examinar las competencias se estructuró tomando en consideración preguntas que reproducen el proceso de toma de decisiones y el contexto que tienen que enfrentar los administradores. Los resultados evidencian, independientemente de la modalidad educativa, niveles de apreciación cercanos al avanzado en competencias básicas, transversales y específicas. Resaltaron indicadores favorables en el trabajo en equipo y la necesidad de potenciar la competencia de elaboración de proyectos. Se advierten diferencias significativas en estudiantes de la modalidad virtual con respecto a otras modalidades.

Resumen: El objetivo de esta investigación es detectar requerimientos de formación para prácticas de navegación segura en Internet de profesores universitarios. Se aporta una visión sobre patrones de comportamiento, capacitación y nivel de competencia enfocados en el uso crítico y seguro del Internet. La investigación es exploratoria y utiliza un instrumento basado en el marco digital DigComp. La muestra está compuesta por 338 docentes de 39 universidades de nueve países hispanos. Se realizó un análisis estadístico descriptivo e inferencial. Los resultados revelan que las universidades están capacitando a los profesores en competencias digitales, pero con escasa formación en seguridad. Hay una tendencia en los profesores a involucrarse en experiencias con consecuencias negativas, pero existen mejoras significativas del nivel de competencia y hábitos seguros en función de la capacitación. Se concluye que hay evidencia de la necesidad de una formación que refuerce el uso responsable de las tecnologías impidiendo riesgos y peligros.

This study examines how advertising material and brands related to organizational communication are perceived by people with Asperger syndrome, a form of autism. The main objective of the study was to understand whether the perception of advertising differs between individuals with AS and a neurotypical population. Neuromarketing techniques were used to examine two key variables, attention and emotion, which were also measured by physiological and biometric variables. The results were compared with those of a control group from a neurotypical population; i.e., participants who had not been diagnosed with any type of developmental disorder. Commercial advertisements were the preferred material used in this research although social-themed advertisements were also included, some produced by commercial companies and others by institutional advertisers (NGOs and foundations). Qualitative techniques were also used to explain the observed phenomena. Data revealed significant differences between the two groups in their perception of advertising and organizational communication with respect to attention and emotion variables.

Título, resumen y palabras clave también en inglés Resumen basado en el de la publicación Se analiza si el cine resulta un recurso adecuado en niños para estimular el pensamiento divergente al contemplar imágenes que potencian la imaginación y la capacidad inventiva. Para ello se evaluó un programa experimental que gira en torno al visionado de cortometrajes con dibujos animados (factoría Pixar: https://www.pixar.com/short-fi lms#short-fi lms-launch) que sirven de introducción a contenidos de actividades sobre educación emocional, con énfasis en favorecer los procesos creativos en el niño. Se realizó con 63 niños, de entre 6 y 8 años, de 1º de Primaria de tres colegios públicos pertenecientes a la provincia de Alicante, bajo el paradigma cuantitativo y cualitativo, mediante un diseño experimental de comparación de grupos de la variable creatividad, antes y después de la implementación del programa de alfabetización mediática. Se utilizó el Test de Pensamiento Creativo de Torrance (TTCT) para medir la creatividad gráfica de los niños por medio de actividades que exploran las cuatro características básicas del pensamiento creativo: fluidez, originalidad, elaboración y flexibilidad. Los resultados mostraron cambios favorables en la función creativa de los niños de grupos experimentales y no en el grupo de control tras la implementación del programa. No se apreciaron diferencias significativas por razón de género. Se evidencia la utilidad del cine como una herramienta didáctica a incorporar en las aulas de forma permanente y no como una actividad puntual y excepcional. ESP

Statins, which reduce LDL-cholesterol by inhibition of 3-hydroxy-3-methylglutaryl–coenzyme A reductase, are among the most widely prescribed drugs. Skeletal myopathy is a known statin-induced adverse effect associated with mitochondrial changes. We hypothesized that similar effects would occur in cardiac myocytes in a lipophilicity-dependent manner between 2 common statins: atorvastatin (lipophilic) and pravastatin (hydrophilic). Neonatal cardiac ventricular myocytes were treated with atorvastatin and pravastatin for 48 h. Both statins induced endoplasmic reticular (ER) stress, but only atorvastatin inhibited ERK1/2(T202/Y204), Akt(Ser473), and mammalian target of rapamycin signaling; reduced protein abundance of caveolin-1, dystrophin, epidermal growth factor receptor, and insulin receptor-β; decreased Ras homolog gene family member A activation; and induced apoptosis. In cardiomyocyte-equivalent HL-1 cells, atorvastatin, but not pravastatin, reduced mitochondrial oxygen consumption. When male mice underwent atorvastatin and pravastatin administration per os for up to 7 mo, only long-term atorvastatin, but not pravastatin, induced elevated serum creatine kinase; swollen, misaligned, size-variable, and disconnected cardiac mitochondria; alteration of ER structure; repression of mitochondria- and endoplasmic reticulum–related genes; and a 21% increase in mortality in cardiac-specific vinculin-knockout mice during the first 2 months of administration. To our knowledge, we are the first to demonstrate in vivo that long-term atorvastatin administration alters cardiac ultrastructure, a finding with important clinical implications.—Godoy, J. C., Niesman, I. R., Busija, A. R., Kassan, A., Schilling, J. M., Schwarz, A., Alvarez, E. A., Dalton, N. D., Drummond, J. C., Roth, D. M., Kararigas, G., Patel, H. H., Zemljic-Harpf, A. E. Atorvastatin, but not pravastatin, inhibits cardiac Akt/mTOR signaling and disturbs mitochondrial ultrastructure in cardiac myocytes.

The small size of the mouse heart frequently imparts technical challenges when applying conventional in vivo imaging methods for assessing heart function. Here, we describe the use of high-frequency ultrasound imaging in conjunction with a size-tuned blood pool contrast agent for quantitatively assessing myocardial perfusion in living mice. A perflurocarbon microbubble formulation exhibiting a narrow size distribution was developed, and echogenicity was assessed at 18 MHz in vitro. Adult mice were subjected to permanent ligation of the left anterior descending artery. Ultrasound imaging was performed on day 7, and a cohort of intact mice was used as a control. Parasternal long-axis cine clips were acquired at 18 MHz before and after contrast administration. Reduced ejection fraction and increased end-systolic volume were observed in infarcted compared with control mice. In control animals, washin of the contrast agent was visible in all myocardial segments. Reduced contrast enhancement was observed in apical-posterolateral regions of all infarcted mice. A novel method for reslicing of the imaging data through the time domain provided a two-dimensional presentation of regional contrast agent washin, enabling convenient identification of locations exhibiting altered perfusion. Myocardial segments exhibiting diminished contractility were observed to have correspondingly low relative myocardial perfusion. The contrast agent formulation and methods demonstrated here provide the basis for simplifying routine in vivo estimation of infarct size in mice and may be particularly useful in longitudinal evaluation of revascularization interventions and assessment of peri-infarct ischemia. NEW & NOTEWORTHY Murine myocardial contrast echocardiography frequently suffers from poor sensitivity to contrast. Here, we formulated a novel size-tuned microbubble contrast agent and validated it for use with ultra-high-frequency ultrasound. A novel data method for evaluating myocardial perfusion based on reslicing the imaging data through the time domain is presented.

La inclusión de las tecnologías de información y comunicación (TIC) al entorno de la vida académica, tanto de manera formal como informal, ha modificado las prácticas de enseñanza – aprendizaje y, de manera importante, las formas de leer. La presente investigación tiene como objetivo indagar en los habitus y representaciones sociales de estudiantes universitarios respecto a la lectura, incluyendo un énfasis en la lectura en medios digitales, siendo esta una tendencia que impacta cada vez con mayor fuerza en el ámbito educativo y en las prácticas socioculturales de los universitarios. La metodología utilizada para recopilar y analizar datos fue el estudio de caso de estudiantes de dos unidades académicas de la Universidad Estatal de Sonora (UES). Como referentes teóricos se utilizaron algunos conceptos de las teorías de Pierre Bourdieu y Serge Moscovici. Los resultados demostraron que los estudiantes leen más de lo que sus profesores y ellos mismos opinan. Además, que gran parte de lo que de manera cotidiana leen, lo hacen a través de medios electrónicos y se concluye que al igual que en los medios impresos, se requiere estudiar estas formas de leer. Así como del apoyo de los docentes de las diferentes disciplinas para fortalecer las nuevas competencias lectoras de los estudiantes.

Objective of the study was t o identify the antibiotics most frequently used for treatment of nosocomial pneumonia in the DIF Pediatric Hospital of Hidalgo and evaluate the rationality of their prescription by determining the intrinsic value of each antibiotic . This was a descriptive, cross - sectional, indication - prescription study that included patients hospitalized with nosocomial pneumonia from January to December 2014 . Data were obtained using the electronic medical record program Histoclin® and were analyzed with SPSS v18 . Seventy - s ix patients stratified by age group were studied with infants predominating in 47 . 4 % of cases . The most frequently used antibiotics were beta - lactams 98 . 7 % , glycopeptides 71 % , aminoglycosides 35 . 5 % , imidazole derivatives 32 . 9 % and lincosamides 22 . 4 %. Antibiotic treatment interruption at 48 - 72 hours was 12 % ( meropenem, cefepime and vancomycin ). Intrinsic value according to blood cultures was correct in 100 % of cases . Total consumption of antibiotics expressed as DDD / 100 bed - days was for imipenem 9 . 23 DD D / 100 bed - days, amphotericin B 9 DDD / 100 bed - days, cefepime 8 . 27 DDD / 100 bed - days, and vancomycin 8 . 11 DDD / 100 bed - days . Total consumption of antibiotics during this period was 2,740,019 . 85 mg with a total investment of $2,724, 224 . 30 pesos . The intrinsic value of the evaluated drugs was correct . We recommend a standardized antibiotic administration guideline that favors their rational use .

Los abejorros (Bombus spp) son los más importantes polinizadores en cultivos de invernadero. Su producción comercial ofrece a los productores grandes ventajas económicas y agrícolas. Sin embargo, pueden ser afectados por microorganismos, por lo que un entorno inocuo es indispensable. El polen es el principal alimento para su producción y puede ser una fuente importante de bacterias, virus, protozoarios, hongos y levaduras, que afectan su calidad y transmiten enfermedades a estos insectos. Diversos métodos físicos y químicos se han probado para inactivarlos, pero no han sido efectivos y han afectado su calidad nutricional. El uso de radiación gamma es una alternativa eficiente para inactivar los microorganismos presentes en el alimento. El presente trabajo consistió en determinar el efecto de la radiación gamma sobre microorganismos de importancia sanitaria presentes en alimento (polen procesado) destinado para la crianza masiva del abejorro Bombus impatiens. Se probaron dosis de 2, 5, 7 y 9 kGys de radiación y se determinó el contenido de bacterias mesófilas aerobias (BMA), bacterias mesófilas esporuladas (BME), organismos coliformes totales (OCT), hongos, levaduras y la presencia de Paenibacillus larvae en alimento proveniente de tres fuentes de origen: Holanda, México y Chile. Se realizó la identificación por métodos moleculares de bacterias con mayor resistencia a la radiación gamma probada. El contenido microbiano fue mayor de 2 log ufc/g en todos grupos microbianos analizados, siendo las BMA las más abundantes (promedio de 4.7 log ufc/g) y el menor contenido fue para los coliformes totales (promedio de 2.6 log ufc/g). Los hongos y los coliformes no fueron detectados en muestras irradiadas a partir de 5 kGy, mientras que las levaduras y las BMA a partir de 7 kGy (

Reading contributes to meaningful and active learning, therefore it is essential support the reading development of students in order to possess the habilities and the motivation of this practice as a means of: inquire, learn, analyze and posit new knowledge. The following research aims to ascertain the contributing of the subject “Fomento a la Lectura”. The analysis launches from the theoretical principles of Pierre Bourdieu, lev Vygotsky and David Ausubel. A quiz was applied to the students and teachers were interviewed. The research insures that the curriculum planning should begin from the collaborative and academic work for students’ reading development. RESUMEN Leer contribuye al aprendizaje activo y significativo, por ello es fundamental apoyar la formacion lectora de estudiantes para que posean las habilidades y la motivacion de apreciar esta practica como medio para: informarse, aprender, analizar, evaluar y proponer conocimiento nuevo. La investigacion tiene como objetivo indagar si la asignatura “Fomento a la Lectura” fortalece a la formacion integral. Se parte de los principios teoricos de Pierre Bourdieu, Lev Vygotsky y David Ausubel. Y se aplico una encuesta a estudiantes y entrevistas a profesores. La investigacion afirma que la planeacion curricular debe partir del trabajo academico-colaborativo para una formacion como lectores. Contacto principal: amavizcasofia@yahoo.com.mx

The continuing evolution of information and communication technologies (ICT) and their incorporation in various social areas has triggered a series of consequences, they have fundamentally changed the way we live, learn and work. However, regular use of technologies in various areas of life is ensuring that productive use of ICT is reached so that it achieves its greatest potential in the process of teaching and learning. Digital gaps currently exist in higher education institutions, marked by the way they are implemented and used a number of structural elements and patterns of social behavior that there are conceived. In this particular research is shown how informal practices are institutionalized in organizations such as the case of universities and come to have greater influence in the behave of the main actors of the learning process, directly impacting the quality and access to higher education. A hypothesis that is verified by quantitative and qualitative methods arises. The reflections contribute to the debate on digital divide in higher education. RESUMEN La evolucion continua de las tecnologias de informacion y comunicacion (TIC) y su incorporacion en los diver-sos ambitos sociales ha desencadenado una serie de consecuencias, han cambiado fundamentalmente la forma en que vivi-mos, aprendemos y trabajamos. No obstante, el uso habitual de las tecnologias en diversos ambitos de la vida no esta garan-tizando que se alcance un uso productivo de las TIC para que se logre su mayor potencial dentro del proceso de ensenanza y aprendizaje. Actualmente existen brechas digitales en las instituciones de educacion superior, marcadas por la forma en que se implementan y usan una serie de elementos estructurales y por patrones de comportamiento social que ahi se conciben. En esta investigacion en particular se muestra como se institucionalizan practicas informales establecidas en organizaciones como el caso de las universidades y llegan a tener mayor influencia en la forma de conducirse en los actores principales del proceso formativo, impactando directamente en la calidad y el acceso a la ensenanza de los estudiantes. Se plantea una hipotesis que se comprueba mediante metodos cuantitativos y cualitativos. Las reflexiones contribuyen al debate sobre brecha digital en la educacion superior. Contacto principal: ericka.alvarez@ues.mx

The adoption of the IP protocol for serving diverse applications arises the need for mechanisms to prevent network congestion in scenarios with different traffic types (responsive and unresponsive) sharing limited network resources. To deal with this issue, a number of algorithms for active queue management (AQM) have been proposed. However, most of them do not observe the traffic type and usually disregard this knowledge. In this way, the provided service could not comply with the distinctive requirements of the different type of traffic, such as VoIP services, which demand bounded packet latency and loss rate. This paper proposes a new approach to be applied for preventing network congestion in AQM routers. Our scheme includes a procedure for selecting the packet to be dropped that improves the fairness among different classes of flows. We evaluate the use of this approach on distinct AQM schemes in scenarios with different degrees of UDP and TCP traffic mix. Objective and subjective performance measurements are reported. The experimental evaluation indicates that our approach improves the fairness among different traffic classes without using any packet scheduler. In fact, it also improves the VoIP traffic performance in terms of packet dropping probability, MOS (Mean Opinion Score) and intelligibility. We also show that our approach has no negative impact on the packet delay. Moreover, it is not achieved at the expense of TCP responsive traffic.

MLP (muscle LIM protein)-deficient mice count among the first mouse models for dilated cardiomyopathy (DCM), yet the exact role of MLP in cardiac signalling processes is still enigmatic. Elevated PKCα signalling activity is known to be an important contributor to heart failure. Here we show that MLP directly inhibits the activity of PKCα. In end-stage DCM, PKCα is concentrated at the intercalated disc of cardiomyocytes, where it is sequestered by the adaptor protein CARP in a multiprotein complex together with PLCβ1. In mice deficient for both MLP and CARP the chronic PKCα signalling chain at the intercalated disc is broken and they remain healthy. Our results suggest that the main role of MLP in heart lies in the direct inhibition of PKCα and that chronic uninhibited PKCα activity at the intercalated disc in the absence of functional MLP leads to heart failure., Altered function of the muscle LIM protein (MLP) causes dilated cardiomyopathy in mice and humans. Lange et al. explain the molecular role of MLP in the heart by showing that it affects the signalling complex at the intercalated discs of failing hearts that consists of PKCα, PLCβ1 and CARP by inhibiting PKCα auto-phosphorylation and function.

Statins are among the most prescribed drugs worldwide. By inhibiting mevalonate synthesis statins inhibit protein prenylation and thereby may reduce RhoA kinase activity. Cardiac overexpression of ...

Statins reduce low-density lipoprotein cholesterol (LDL-C) and decrease cardiovascular events. Although statins are generally well tolerated, the FDA warns that statins may induce skeletal muscle side effects, cognitive changes and increased fasting glucose levels. Skeletal muscle biopsies from patients with statin myopathy have revealed defects in mitochondrial ultrastructure. Impaired mitochondrial function has been postulated as a key cause of statin-induced myopathy and hepatotoxicity. Long-term statin effects on cardiac muscle are currently unknown. Wild type mice received atorvastatin, pravastatin or vehicle daily for seven months by oral gavage. Atorvastatin and pravastatin reduced LDL-C compared to vehicle. Echocardiography at two-week intervals showed no differences in %FS, %EF, circumferential fiber shortening and ventricular wall thicknesses between atorvastatin, pravastatin and vehicle treated mice. After seven months of atorvastatin, pravastatin or vehicle administration cardiac muscles (n=21-29) were analyzed, and only atorvastatin treated hearts revealed: A) swollen and misaligned mitochondria and accumulation of protein aggregates by transmission electron microscopy (n=4, each), and B) repression of mitochondrial and endoplasmatic reticulum related genes by genome-wide expression profiling. In cultured ventricular myocytes, atorvastatin, but not pravastatin; 1) down-regulated survival pathways via inhibition of ERK1/2T202/Y204, AktSer473 and mTOR signaling (p70 S6 kinaseThy421/Ser4240 and S6 RPSER 235/236), 2) reduced protein expression of caveolin-1, dystrophin, epithermal growth factor receptor and insulin receptor β, 3) decreased RhoA activation, and 4) induced apoptosis. LDL-C reduction by atorvastatin, but not pravastatin, was associated with a repression of mitochondrial and endoplasmic reticulum related genes, an accumulation of protein aggregates, and swollen mitochondria. This is the first report demonstrating that long-term atorvastatin treatment causes adverse effects on cardiac muscle with preserved cardiac function. Whether these changes predispose atorvastatin treated hearts to contractile dysfunction after hemodynamic stress needs further investigation.

Introduction: Statins are widely used to lower low-density lipoprotein cholesterol (LDL-C) for prevention of cardiovascular disease. The FDA warns that statins may induce skeletal muscle side effects. Skeletal muscle biopsies from patients with statin myopathy showed defects in mitochondrial ultrastructure. Impaired mitochondrial function was postulated as a key cause of statin-induced myopathy. Long-term statin effects on cardiac muscle are currently unclear. Methods and Results: Neonatal cardiac myocytes were treated with either atorvastatin (lipophilic) or pravastatin (hydrophilic) for up to 48 hours (both at 1-10 μM). Atorvastatin, but not pravastatin, inhibited RhoA activation, reduced mTOR/AKT signaling, and induced apoptosis. Further, atorvastatin treatment reduced protein expression of caveolin, dystrophin and epidermal growth factor receptor in cardiac myocytes. Both statins induced ER stress responses, but only atorvastatin increased CHOP initiated apoptotic cell death. Assessment of mitochondri...

De cara al S.XXI, es necesario innovar dentro de las aulas con recursos utilizados por los nativos digitales. La innovación debe presentarse como elemento motivador, por lo que implementarla es un gran reto. Las redes sociales han permitido que estudiantes y docentes interactúen de una manera más natural al usar lenguajes que utilizan para actividades fuera del aula. En esta Investigación se pretende conocer si la estrategia de implementación de Facebook en las clases, es aceptada por los estudiantes como una herramienta más para el proceso de enseñanza-aprendizaje en el ámbito universitario. Today, it is necessary to innovate in the classroom with resources used by digital natives. This innovation must be present as a motivator in classrooms; therefore, to implement it is currently a challenge. The social networks have allowed to the teachers interact with students in a more natural way, using the same language that they use for their activities outside the classroom. In this research, we expect to know if students accept the strategy of Facebook implementation in the classroom, as a tool for teaching-learning process in the university.

Patients with obstructive sleep apnea, who experience episodic hypoxia and hypercapnia during sleep, often demonstrate increased inflammation, oxidative stress, and dyslipidemia. We hypothesized that sleep apnea patients would be predisposed to the development of atherosclerosis. To dissect the mechanisms involved, we developed an animal model in mice whereby we expose mice to intermittent hypoxia/hypercapnia (IHH) in normobaric environments. Two- to three-month-old low-density lipoprotein receptor deficient ( Ldlr−/−) mice were fed a high-fat diet for 8 or 16 wk while being exposed to IHH for either 10 h/day or 24 h/day. Plasma lipid levels, pulmonary artery and aortic atherosclerotic lesions, and cardiac function were then assayed. Surprisingly, atherosclerosis in the aorta of IHH mice was similar compared with controls. However, in IHH mice, atherosclerosis was markedly increased in the trunk and proximal branches of the pulmonary artery of exposed mice; even though plasma cholesterol and triglycerides were lower than in controls. Hemodynamic analysis revealed that right ventricular maximum pressure and isovolumic relaxation constant were significantly increased in IHH exposed mice and left ventricular % fractional shortening was reduced. In conclusion, 1) Intermittent hypoxia/hypercapnia remarkably accelerated atherosclerotic lesions in the pulmonary artery of Ldlr−/− mice and 2) increased lesion formation in the pulmonary artery was associated with right and left ventricular dysfunction. These findings raise the possibility that patients with obstructive sleep apnea may be susceptible to atherosclerotic disease in the pulmonary vasculature, an observation that has not been previously recognized.

To deal with congestion control in internet protocol (IP) networks, different active queue management schemes have been successfully proposed. However, many of these schemes do not take into consideration the particular Voice over Internet Protocol (VoIP) requirements, thereby potentially penalizing this traffic. In this paper, we propose and evaluate a dropping packet selection algorithm for queue management schemes. This algorithm, called Drop-SwD , protects VoIP traffic without affecting other User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) traffic. Additionally, to preserve the quality of the VoIP service, the proposed algorithm selects the lowest quality packets (with less impact on the subjective quality) to be dropped. The application of the algorithm in different active queue management schemes is evaluated using objective and subjective quality metrics and intelligibility metrics as well. As a result, we show that Drop-SwD improves the final quality of the voice packets’ flow, without degrading the performance of other traffic class, with respect to the packet dropping schemes of reference.