Frecuencia y características de uso de Internet por adolescentes espanoles: Un estudio transversal / Frequency and characteristics of Internet use by Spanish teenagers: A cross-sectional study

Introducción: Internet ha transformado la comunicación entre las personas en el mundo actual, especialmente en el caso de los más jóvenes. El objetivo de este estudio es determinar la frecuencia de uso de Internet por adolescentes, así como las aplicaciones utilizadas. Población y métodos: Se trata de un estudio transversal. En noviembre de 2013, los estudiantes de la escuela secundaria obligatoria de dos institutos de Albacete fueron invitados a responder un cuestionario autoadministrable, con preguntas de respuesta abierta y cerrada. Contestaron en las aulas, "on line" o con "lápiz y papel". Las respuestas fueron introducidas en una base de datos informatizada, con el programa SPSS 17.0. El análisis estadístico ha incluido comparación de proporciones (chi cuadrado) y de medias/medianas (t de Student/pruebas no paramétricas). Resultados: Participaron 967 estudiantes, con media de edad de 13,8 años (rango: 11-20); 53,5% de mujeres. La mayoría (70,9%) vivían en la ciudad. La clase social era mayoritariamente media (51,3%) y alta (34,8%). La mayoría se conectaba a Internet a diario (73,4%); solo 0,9% decía no conectarse nunca. Las aplicaciones más utilizadas eran WhatsApp (77,1%), redes sociales (70,1%) y relacionadas con música (66,6%). Se ha encontrado una mayor frecuencia de utilización por las mujeres de redes sociales (p= 0,004), WhatsApp (p <0,0001), Instagram (p <0,0001) y escuchar música (p= 0,004). Los varones navegaban más (p <0,0001), utilizaban Skype (p= 0,001), jugaban (p <0,0001) y veían películas o series (p= 0,035). Conclusiones: Internet ocupa una gran parte del tiempo de los adolescentes, especialmente como medio de comunicación, y WhatsApp y las redes sociales son las aplicaciones que utilizan con más frecuencia.

Introduction. Internet has completely changed communication among people in today's world, especially among young users. The objective of this study is to establish the frequency of Internet use by teenagers, and most used apps. Population and methods. This was a crosssectional study. In November 2013, students attending two mandatory secondary schools in Albacete were invited to complete a self-administered questionnaire with close-ended and open questions. Questionnaires were completed in the classroom, either "online" or "with pen and paper". Answers were entered in a computer database using the SPSS 17.0 software. Statistical analysis included a comparison of proportions (χ2 test) and mean/median values (Student's t test/non-parametric tests). Results. Nine hundred and sixty-seven students participated; their mean age was 13.8 years old (range: 11-20); 53.5% were girls. Most students (70.9%) lived in the city. Most belonged to a middle (51.3%) and high (34.8%) socioeconomic status. Also most students went online on a daily basis (73.4%); only 0.9% indicated that they never did. The most frequently used apps included WhatsApp (77.1%), social networks (70.1%) and music apps (66.6%). Among girls, the most common Internet use was social networks (p= 0.004), WhatsApp (p < 0.0001), Instagram (p < 0.0001) and listening to music (p= 0.004). Boys most commonly used the Internet to browse the web (p < 0.0001), Skype (p=0.001), play (p < 0.0001) andwatchmovies or TV shows (p= 0.035). Conclusions. Internet takes up a large part of the time in adolescents' lives, especially as a means of communications, being WhatsApp and social networks the most commonly used apps.

Predicting mortality in hospitalized patients with 2009 H1N1 influenza pneumonia.

BACKGROUND: Community-acquired pneumonia (CAP) severity scores can identify patients at low risk for mortality who may be suitable for ambulatory care. Here, we follow the clinical course of hospitalized patients with CAP due to 2009 H1N1 influenza. OBJECTIVE: To evaluate the role of CAP severity scores as predictors of mortality. METHODS: This was a secondary data analysis of patients hospitalized with CAP due to 2009 H1N1 influenza confirmed by reverse transcriptase polymerase chain reaction enrolled in the CAPO (Community-Acquired Pneumonia Organization) international cohort study. CAP severity scores PSI (Pneumonia Severity Index), CURB-65 (confusion, urea, respiratory rate, blood pressure, age ≥ 65 years) and CRB-65 (confusion, respiratory rate, blood pressure, age ≥ 65 years) were calculated. Actual and predicted mortality rates were compared. A total of 37 predictor variables were evaluated to define those associated with mortality. RESULTS: Data from 250 patients with CAP due to 2009 H1N1 influenza were analyzed. Patients with low predicted mortality rates (0-1.5%) had actual mortality rates ranging from 2.6% to 17.5%. Obesity and wheezing were the only novel variables associated with mortality. CONCLUSIONS: The decision to hospitalize a patient with CAP due to 2009 H1N1 influenza should not be based on current CAP severity scores, as they underestimate mortality rates in a significant number of patients. Patients with obesity or wheezing should be considered at an increased risk for mortality.

Sustained firing of alpha and gamma hind limb motoneurons induced by stimulation of the pudendal nerve.

Axons from receptors in the cat vaginal wall run in the sensory pudendal nerve (SPN), and brief (<10 s) vaginal probing (VP) in the decerebrate cat produces a long-lasting (>1 min) contraction of the triceps surae (TS) muscles. The aim of the present project was to find out whether brief SPN stimulation also produces sustained TS response and, eventually, to study the mechanisms involved in it. Decerebrate female cats were used. In some cats, TS electromyography (EMG) and tension response were recorded; stimulation of left SPN with single or repetitive trains of shocks produced a bilateral TS response that outlasted the stimulus >1 min as VP did. In paralyzed cats (pancuronium; Panc), intracellular recordings were made from hind limb motoneurons (MNs). SPN stimulation produced a depolarization 1 min) electroneurographic (ENG) postdischarge in a small filament of the medial gastrocnemius (MG) nerve; the MG EMG postdischarge was also recorded. Large spikes (LS) and small spikes (SS) were distinguished in the ENG. During the postdischarge, LS frequency and the integrated EMG activity correlated well (r > 0.9); no correlation was found between SS and EMG. After Panc injection, LS postdischarge was absent but the SS postdischarge remained. LS followed by EMG potential were also evoked by brief TS stretch (reflex LS); single shocks to SPN only elicited SS that were not followed by EMG potential. It is concluded that alpha axons and gamma axons produced LS and SS, respectively, and that SPN activates gamma axons. It is proposed that, in the nonparalyzed cats, the stimulation of SPN with trains of shocks might cause an increase in the afferent inflow from muscle spindles to alpha MNs through the sustained firing of gamma MNs. The increased excitatory inflow would depolarize alpha MNs and allow bistable MN firing; Panc would decrease this inflow by blocking transmission to the spindle fibers.