Frecuencia y tipología del segundo conducto mesiovestibular en primeros molares superiores / Frequency and typology of the second mesiobuccal canal in maxillary first molars

Objetivos: Evaluar mediante microscopia quirúrgica la presencia del segundo conducto mesiovestibular (MV2) en el piso de la cámara pulpar de los primeros molares superiores, determinar su abordabilidad, establecer el calibre de lima que llegó al tercio apical y tipificar radiovisiográficamente su morfología se-gún la clasificación de Weine. Materiales y métodos: Se utilizaron 48 primeros molares superiores huma-nos extraídos. Sé tomaron radiovisografías preope-ratorias (Carestream 5200) en sentido orto radial y mesio-distal. Se realizó apertura y se localizó entra-da del MV2 con microscopio quirúrgico (Newton MEC XXI, Argentina) a 16 x. Se cateterizó MV1 y MV2 con limas tipo K #10 y #15 (Dentsply Maillefer). Se cortó raíz distovestibular para mejorar visualización ra-diovisográfica. Se tomó conductometria en sentido mesio-distal para establecer la tipología. Se compa-raron frecuencias y porcentajes mediante test de Chi-cuadrado con corrección de Yates, prueba exac-ta de Fisher y test z para diferencia de proporcio-nes. Se calcularon intervalos de confianza 95% para porcentajes mediante método score de Wilson. Re-sultados: El 54% (26 casos) presentó MV2. De los 26 MV2, el 77% (20 casos) fueron abordables, porcen-taje significativamente mayor al 23% no abordable (z=3,62; P<0,05). Al hacer cateterismo, hubo asocia-ción significativa entre tipo de conducto (MV1 y MV2) y calibre de lima que llegó al tercio apical (Chi-cua-drado=29,12; gl=1; P<0,05). La tipología I (58%) fue significativamente mayor que las tipologías II (21%) y III (21%) (P<0,05 para ambas comparaciones). Con-clusión: El alto porcentaje de piezas que presentó MV2 evidencia la importancia clínica de detectarlo y tratarlo correctamente. Dado el alto porcentaje de piezas donde fue abordable, se concluye que el clíni-co debe tener conocimiento, destreza y la tecnología necesaria para poder abordarlo. Si bien la tipología I (58%) fue la más encontrada, cuando el MV2 termina en foramen independiente (tipo III), su omisión puede conducir al fracaso del tratamiento (AU))

Objectives: To evaluate by surgical microscopy the presence of second mesiobuccal canal (MB2) in the pulp chamber floor of the maxillary first molars, determine its approachability, establish the caliber of the file that reached the apical third, and radiographically typify its morphology according to Weine ́s classification. Materials and methods: 48 extracted human maxillary first molars were used. Preoperative radiovisographies (Carestream 5200) were taken in ortho-radial and mesio-distal direction. Coronal access was made and the entrance of MB2 was located with a surgical microscope (Newton MEC XXI, Argentina) at 16x. MB1 and MB2 were catheterized with K files #10 and #15 (Dentsply Maillefer). Distobuccal root was cut to improve radiovisographic visualization. Conductometry was taken in mesio-distal direction to establish the typology. Frequencies and percentages were compared using Chi-square test with Yates correction, Fisher's exact test and z test for difference in proportions. 95% confidence intervals were calculated for percentages using Wilson score method. Results: 54% (26 cases) presented MB2. Of the 26 MB2, 77% (20 cases) were approachable, a significantly higher percentage than those not approachable (z=3.62; P<0.05). When performing catheterization, there was a significant association between type of canal (MB1 and MB2) and file caliber that reached the apical third (Chi-square=29.12; df=1; P<0.05). Typology I (58%) was significantly higher than typologies II (21%) and III (21%) (P<0.05 for both comparisons). Conclusion: The high percentage of specimens that showed MB2 evidence the clinical importance of detecting and treating it correctly. Given the percentage of pieces where it was approachable (77%), it is concluded that the clinician must have the knowledge, skill and necessary technology to be able to approach it. Although typology I (58%) was the most found, when MB2 ends an independent foramen (type III), its omission can lead to treatment failure (AU)

La rehabilitación cognitiva para pacientes con esquizofrenia de larga data: un desafío para los equipos de salud / The cognitive rehabilitation of patients with long-standing schizophrenia: a challenge for health teams

Introduction: The differences in the scores observed in the attention, memory and executive functions regarding the use of a cognitive rehabilitation program in patients with long-standing schizophrenia are analysed. Method: The participants were selected through a nonprobability sampling with a purposive sample ofcritical cases (n = 31). It is a causal research, which considers a quasi-experimental design of two groups (experimental and control) with pre and postintervention measures. To measure the variables, the TMTA & B, WAIS, ROCF and the Stroop P & C tests were administered. Results: The intervention had a clinically significant impact on the domains of visual spatial attention and the executive function (speed of verbal information processing), given by the differences caused by the post-intervention means. There were only statistically significant differences of means in the post-test scores for the Rey-Osterrieth complex figure test, in the Memory-Time variable, whose treatment has a low impact and false negative rates higher than initially expected. At the same time, regarding the variability of the scores, there were not statistically significant differences for any of the variables analysed. Conclusions: Training the identification of symbols, using memories of details of projected images and simple words association, in a group-competition context with playful elements, have a clinically relevant impact on the rehabilitation of the visual spatial attention and the speed of verbal information processing of patients with long-standing schizophrenia. The statistically significant differences of means require to be considered with care.

Introducción: Se analizan las diferencias en las puntuaciones observadas en atención, memoria y función ejecutiva en función de un programa de rehabilitación cognitiva en pacientes con esquizofrenia de larga data. Método: Los participantes fueron seleccionados mediante un muestreo noprobabilístico con una muestra intencional de casos críticos (n = 31). Investigación explicativa, con diseño cuasi experimental de dos grupos (experimental y control) y medidas pre y post intervención. Para medir las variables se administraron los test TMT A y B, WAIS, F.C. de Rey, STROOP P y C. Resultados: La intervención tuvo un impacto clínicamente significativo en el Dominio de la Atención focalizada visual y en el Dominio Ejecutivo (velocidad de procesamiento de información verbal) dado por las diferencias de medias post intervención. Sólo existieron diferencias de medias estadísticamente significativas en los puntajes post test para la Figura Compleja de Rey en la variable Memoria-Tiempo, cuyo tratamiento tiene un impacto bajo y tasas de falsos negativos superiores a las esperadas. A su vez, respecto a la variabilidad de las puntuaciones, no se observaron diferencias estadísticamente significativas para ninguna de las variables analizadas. Conclusiones: Entrenar identificando símbolos, recuerdos de detalles de imágenes proyectadas, asociación de palabras simples, en contextos de competición entre grupo con elementos lúdicos, tiene un impacto clínicamente relevante en la rehabilitación de la atención focalizada visual y en la velocidad de procesamiento de información verbal en sujetos con esquizofrenia de larga data. Las diferencias de medias estadísticamente significativas detectadas requerirían ser consideradas con precaución.

Detección de bocavirus humano en la población infantil de Tucumán y Santa Fe, Argentina / Detection of human bocavirus in children from Tucuman and Santa Fe, Argentina

Background: A large proportion of acute respiratory tract infections (ARTI) remain without etiologic diagnosis, reason why new pathogens are investigated continuously. Human bocavirus (HBoV) was discovered in 2005, as a new member of Parvoviridae family and proposed to cause ARTI. Aim: To know the prevalence of HBoV among pediatric populations hospitalized for ARTI in two provinces of Argentina: Santa Fe and Tucuman; and to describe epidemiological and clinical aspects associated to its detection. Materials and Methods: We studied nasopharyn-geal aspirates of patients younger than 5 years old that were hospitalized during 2013 due ARTI. HBoV DNA was assayed using PCR described by Allander et al. Traditional virnses were studied by immunofluorescence. Personal, clinical and epidemiological data were collected in a standardized form. Results: The HBoV was detected in 7% of the samples and was prevalent in spring and summer and in children younger of 2 years old. Other respiratory viruses were detected in 22% of HBoV positive samples. Discussion: We detected HBoV in these two provinces of Argentina. Further studies should be performed to determine if it’s a recent infection or prolonged viral shedding.

Introducción: Un alto porcentaje de las infecciones respiratorias agudas (IRA) permanece sin diagnostico etiológico, por lo cual se investigan nuevos patógenos continuamente. Bocavirus humano (HBoV) fue descubierto en 2005, como un nuevo miembro de la familia Parvoviridae y propuesto como causante de IRA. Objetivos: Investigar la prevalencia de HBoV en niños bajo 5 años de edad, hospitalizados por IRA en dos provincias de Argentina: Santa Fe y Tucumán y describir aspectos epidemiológicos y clínicos asociados a su detección. Materiales y Métodos: Se estudiaron retrospectivamente los aspirados nasofaríngeos (ANF) de pacientes bajo 5 años de edad, con diagnóstico de IRA, hospitalizados durante el año 2013. La presencia de HBoV se detectó mediante la RPC de punto final descripta por Allander y cols. Los virus tradicionales se estudiaron mediante inmunofluorescencia. Datos personales, clínicos y epidemiológicos se recolectaron en una planilla estandarizada. Resultados: HBoV fue detectado en 7% de las muestras con prevalencia en primavera y verano; y principalmente en pacientes bajo 2 años de edad. Se registró co-detecciones en 22% de los casos. Discusión: Hemos detectado HBoV en estas dos provincias de Argentina; estudios posteriores deberán efectuarse para determinar si se trata de una infección reciente o una excreción prolongada del virus.

Investigaciones en rehabilitación cognitiva para pacientes con esquizofrenia (2004-2013): una revisión temática en beneficio de propuestas para etapas iniciales del trastorno / Research in cognitive rehabilitation of patients with schizophrenia (2004-2013): A thematic review aimed at proposals for early stages of the disorder

A thematic review of research in cognitive reabilitation of patients with schizophrenia is presented with the purpose of systematizing a contribution to the generation of intervention proposals for early stages of the disorder. Sudies are reviewed between 2004-2013 based on the "PubMed.gov" and "Scielo.org" search engines. Forty-two papers were found and 19 were selected, applying as inclusion criteria research with control groups that show positive results in the rehabilitation of attention, memory, and executive function. Furthermore, the aim is to get to know the cognitive rehabilitation program on which that research is based in order to appreciate its approach and its emphases. The results show a corpus of interventions which, in spite of their diversity, have a significant impact on the patients' cognitive and psychosocial functioning. The main predictors of good results are low age, low degree of cognitive deterioration, and low use of antipsychotic medication at the time of intervention. Improvement of executive functioning appears to be the best predictor of the patients' functionality in everyday activities. An impact is also seen of cognitive improvement on relevant clinical indicators: functioning in everyday activities, social adjustment, and clinical indices associated with a decrease of the observed symptoms. It is concluded that these results, together with research in which it is estimated that the alteration of the course of the schizophrenia requires early and multimodal work, imply the need to generate therapeutic proposals from the first episodes where the cognitive rehabilitation of the patient cannot be absent.

The cellular mechanisms of body iron homeostasis

Cells tightly regulate iron levels through the activity of iron regulatory proteins (IRPs) that bind to RNA motifs called iron responsive elements (IREs). When cells become iron-depleted, IRPs bind to IREs present in the mRNAs of ferritin and the transferrin receptor, resulting in diminished translation of the ferritin mRNA and increased translation of the transferrin receptor mRNA. Similarly, body iron homeostasis is maintained through the control of intestinal iron absorption. Intestinal epithelia cells sense body iron through the basolateral endocytosis of plasma transferrin. Transferrin endocytosis results in enterocytes whose iron content will depend on the iron saturation of plasma transferrin. Cell iron levels, in turn, inversely correlate with intestinal iron absorption. In this study, we examined the relationship between the regulation of intestinal iron absorption and the regulation of intracellular iron levels by Caco-2 cells. We asserted that IRP activity closely correlates with apical iron uptake and transepithelial iron transport. Moreover, overexpression of IRE resulted in a very low labile or reactive iron pool and increased apical to basolateral iron flux. These results show that iron absorption is primarily regulated by the size of the labile iron pool, which in turn is regulated by the IRE/IRP system.