Neuropatía laríngea y movimiento paradojal de cuerdas vocales en la edad pediátrica: reporte de un caso / Laryngeal neuropathy and paradoxical vocal fold motion in the pediatric age: case report

Resumen La neuropatía laríngea es una condición de hipersensibilidad, hiperreactividad e hiper-función laríngea secundaria a un desequilibrio entre las aferencias y eferencias laríngeas. La respuesta individual y exagerada frente a diversos gatillantes específicos puede generar síntomas como tos crónica, parestesia laríngea, carraspera, disfonía, estridor, sensación de globus faríngeo, movimiento paradojal de las cuerdas vocales (también conocido como disfunción cordal) y/o laringoespasmo. Existe abundante literatura sobre neuropatía laríngea en adultos, sin embargo, en niños es limitada. El objetivo de este artículo es dar a conocer un caso de neuropatía laríngea en la edad pediátrica y la importancia de su consideración en el enfrentamiento de estos pacientes. Se presenta caso clínico de un paciente de 13 años, con antecedente de cirugía cardiaca reciente, evoluciona con disfonía severa evidenciándose aparente inmovilidad cordal bilateral con resultados discordantes entre nasofibrolaringoscopía y electromiografía laríngea. Posteriormente presenta mejorías en su voz, sin embargo, se agregan otros síntomas laringológicos como carraspera, globus faríngeo y estridor no explicados por causas anatómicas. Se expone la evaluación y abordaje otorrinolaringológico-fonoaudiológico para el caso. Se concluye que el diagnóstico de neuropatía laríngea requiere un alto índice de sospecha clínica ante signos laringológicos sugerentes, debiendo descartarse causas orgánicas y estructurales. El abordaje otorrinolaringológico-fonoaudiológico constituye el pilar terapéutico asociado al uso de neuromoduladores en casos seleccionados.

Abstract Laryngeal neuropathy is a condition of hypersensitivity, hyperresponsiveness and laryngeal hyperfunction secondary to an imbalance between laryngeal afferent and efferent information. The individual and exaggerated response to diverse specific triggers can lead to symptoms such as chronic cough, laryngeal paresthesia, throat clearing, dysphonia, stridor, globus pharyngeus, vocal cord dysfunction, and/or laryngospasm. There is plentiful literature on laryngeal neuropathy in adults, however, in children, it is limited. Here, we present a case report of laryngeal neuropathy in the pediatric age and discuss the importance of its consideration in the approach of these patients. A case of a 13-year-old patient, recently intervened with cardiac surgery that evolves with severe dysphonia is presented. Nasofibrolaryngoscopy shows apparent bilateral vocal fold immobility with discordant results in laryngeal electromyography. Later, his voice improves but other laryngological symptoms appeared, such as throat clearing, globus pharyngeus and stridor, not explained by anatomical causes. The otolaryngological-speech therapy evaluation and approach for the case is exposed. We conclude that for the diagnosis of laryngeal neuropathy, a high index of clinical suspicion is required in the presence of suggestive laryngological symptoms, and organic and structural causes must be previously ruled out. The otorhinolaryngological-logopedic approach constitutes the mainstay of treatment associated with the use of neuromodulators in selected cases.

Análisis descriptivo del índice de discapacidad vocal pediátrico en niños con patología vocal benigna / Descriptive analysis of the pediatric voice handicap index in children with benign vocal fold pathology

Resumen Introducción: La disfonía infantil puede afectar negativamente la autoestima del niño y su calidad de vida relacionada con la voz. Objetivo: Describir los resultados del cuestionario Pediatric Voice Handicap Index (pVHI) en niños con patología vocal benigna. Material y Método: Se diseñó un estudio descriptivo en pacientes con patología vocal benigna entre 3 y 15 años en la Unidad de Voz del Hospital de Niños Dr. Luis Calvo Mackenna entre octubre de 2016 y febrero de 2020. La evaluación se realizó mediante un examen laringoscópico y el cuestionario pVHI para evaluar el impacto en la calidad de vida. Resultados: Se incluyeron 49 pacientes, 35 varones (71,4%) y 14 mujeres (28,6%). La edad media fue de 9,27 años. En el examen laringoscópico, el hallazgo más frecuente fueron los nódulos vocales. La puntuación media total en el pVHI fue de 38,77: 11,67 en la subescala o categoría funcional, 18,59 en la física y 8,42 en la emocional. En la evaluación de pVHI por género no existieron diferencias significativas. Conclusión: La patología vocal benigna en la edad pediátrica ocasiona un impacto negativo en la calidad de vida relacionada con la voz. El cuestionario pVHI es un valioso instrumento para evaluar dicha repercusión.

Abstract Introduction: Childhood dysphonia can negatively affect a child's self-esteem and voice-related quality of life. Aim: To describe the results of the Pediatric Voice Handicap Index (pVHI) questionnaire in children with benign vocal fold pathology. Material and Method: A descriptive study was designed in patients with benign vocal fold pathology between 3 and 15 years of age in the Voice Unit of the Dr. Luis Calvo Mackenna Children's Hospital between October 2016 and February 2020. The evaluation was carried out through a laryngoscopic examination and pVHI questionnaire to assess the impact on quality of life. Results: Forty-nine patients were included, 35 boys (71.4%) and 14 girls (28.6%). The mean age was 9.27 years. On laryngoscopic examination, the most frequent finding was vocal fold nodules. The total mean score on the pVHI was 38.77: 11.67 on the functional subscale, 18.59 on the physical subscale, and 8.42 on the emotional subscale. In the evaluation of pVHI by gender, no significant differences were found. Conclusion: Benign vocal fold pathology in pediatric age causes a negative impact on voice-related quality of life. The pVHI questionnaire is a valuable instrument to assess this repercussion.

Adaptación cultural y validación del índice de discapacidad vocal pediátrico al español chileno

Resumen Introducción: La prevalencia de patología vocal en niños fluctúa entre el 6% y el 23%. El cuestionario Pediatric Voice Handicap Index (pVHI) se ha transformado en el instrumento más utilizado a nivel internacional para determinar el impacto de la disfonía en la calidad de vida de los niños. Objetivo: Realizar la traducción, adaptación cultural y validación del Pediatric Voice Handicap Index al español chileno. Material y Método: Estudio transversal que incluyó a 151 niños y niñas entre 3 y 15 años. Se siguieron los 5 pasos recomendados por Beaton. La versión original del pVHI en inglés fue traducida al español por dos traductoras. Posteriormente, la versión traducida y unificada fue revisada por una lingüista chilena quien realizó la adaptación cultural al idioma español chileno. El cuestionario se aplicó a dos grupos de estudio, un grupo de niños con disfonía (n = 51) y un grupo control de niños sin alteraciones de la voz (n = 100) para obtener la versión final. Resultados: Se encontraron diferencias significativas entre el grupo de niños con disfonía y el grupo control en la puntuación global del pVHI y las diferentes subescalas (p < 0,001). Se encontró una consistencia interna óptima con un excelente alfa de Cronbach (α = 0,93), con una alta fiabilidad test-retest (puntuación de correlación de Pearson = 0,95). Conclusión: La versión chilena del cuestionario pVHI presenta un alto grado de validez y confiabilidad. Recomendamos su uso e implementación como protocolo estándar en la evaluación y seguimiento de la voz pediátrica.

Abstract Introduction: The prevalence of vocal pathology in children fluctuates between 6% and 23%. The pediatric voice handicap index (pVHI) questionnaire has become the most widely used instrument to determine the impact of dysphonia on the quality of life of children. Aim: Perform the translation, cultural adaptation, and validation of the pediatric voice handicap index into Chilean Spanish. Material and Method: Cross-sectional study that included 151 boys and girls between 3 and 15 years old. The 5 steps recommended by Beaton were followed. The original version of the pVHI in English was translated into Spanish by two translators. Subsequently, the translated and unified version was reviewed by a Chilean linguist who made the cultural adaptation to the Chilean Spanish language. The questionnaire was applied to two study groups, a group of children with dysphonia (n = 51) and a control group of children without voice disorders (n = 100) to obtain the final version. Results: Significant differences were found between the group of children with dysphonia and the control group in the global pVHI score and the different subscales (p < 0.001). Optimal internal consistency was found with excellent Cronbach's alpha (α = 0.93), with high test-retest reliability (Pearson's correlation score = 0.95). Conclusion: The Chilean version of the pVHI questionnaire presents a high degree of validity and reliability. We recommend its use and implementation as a standard protocol in the evaluation and monitoring of pediatric voice.

Caracterización de los pacientes con disfonía evaluados en la unidad de voz pediátrica del Hospital Dr. Luis Calvo Mackenna / Characterization of patients with dysphonia evaluated in the pediatric voice unit of the Dr. Luis Calvo Mackenna Hospital

RESUMEN Introducción: La importancia del diagnóstico y manejo adecuado de los trastornos vocales en pacientes pediátricos, radica en que un mismo síntoma como la disfonía, puede tener etiologías de significación variable. Objetivo: Conocer la epidemiología y características de los pacientes pediátricos con disfonía crónica derivados a la Unidad de Voz del Hospital Dr. Luis Calvo Mackenna, y con ello generar un protocolo de diagnóstico y manejo coordinado entre fonoaudiólogos y otorrinolaringólogos. Material y método: Estudio prospectivo descriptivo con revisión de fichas clínicas y protocolos operatorios de pacientes que se controlan en la Unidad de Voz del Hospital Dr. Luis Calvo Mackenna. Resultados: En la unidad de voz hay en seguimiento 22 niños con una edad promedio de 10 años. Las lesiones diagnosticadas con mayor frecuencia mediante videonasolaringoscopía fueron los nódulos vocales (n =10) y el aumento de volumen asimétrico a nivel cordal (n =8). Se pudo realizar telelaringoscopía con videoestroboscopía en el 81,8% de los pacientes. Del total de pacientes en control, 10 requirieron laringoscopía directa. Conclusión: La disfonía en el niño suele ser un síntoma subestimado y, por ende, no tratado. Consideramos que una unidad de voz infantil debe preocuparse de evaluar sus pacientes con tecnología acorde a su edad y de realizar un seguimiento adecuado de los tratamientos.

ABSTRACT Introduction: Adequate diagnosis and proper management of voice disorders in pediatric patients lies in that the symptom dysphonia, can have etiologies of variable significance. Aim: To evaluate the epidemiology and characteristics of pediatric patients with chronic dysphonia that are referred to the voice unit of Dr. Luis Calvo Mackenna Hospital, and thereby generate a diagnostic protocol and coordinated management strategy between speech pathologist and otolaryngologist. Material and method: Prospective descriptive study with review of clinical files and operative protocols of patients followed-up at the voice unit of the Dr. Luis Calvo Mackenna Hospital. Results: In the voice unit, there are 22 children being followed up. The most frequently diagnosed lesions with videonasolaryngoscopy were vocal nodules (n=10) and asymmetric volume on the vocal cord (n=8). We performed telelaryngoscopy with videostroboscopy in 81.8% of patients. Of all the patients, 10 required direct laryngoscopy. Conclusions: Dysphonia in children is usually an underestimated symptom and, therefore, not treated. We believe that a children's voice unit should evaluate their patients with the appropriate technology according to the patients age, and to carry out an adequate follow-up of the treatments administered.

The Role of Adsorbed and Subsurface Carbon Species for the Selective Alkyne Hydrogenation Over a Pd-Black Catalyst: An Operando Study of Bulk and Surface.

The selective hydrogenation of propyne over a Pd-black model catalyst was investigated under operando conditions at 1 bar making use of advanced X-ray diffraction (bulk sensitive) and photo-electron spectroscopy (surface sensitive) techniques. It was found that the population of subsurface species controls the selective catalytic semi-hydrogenation of propyne to propylene due to the formation of surface and near-surface PdCx that inhibits the participation of more reactive bulk hydrogen in the hydrogenation reaction. However, increasing the partial pressure of hydrogen reduces the population of PdCx with the concomitant formation of a ß-PdHx phase up to the surface, which is accompanied by a lattice expansion, allowing the participation of more active bulk hydrogen which is responsible for the unselective total alkyne hydrogenation. Therefore, controlling the surface and subsurface catalyst chemistry is crucial to control the selective alkyne semi-hydrogenation.

Probing Electron Spin Resonance in Monolayer Graphene.

The precise value of the g factor in graphene is of fundamental interest for all spin-related properties and their application. We investigate monolayer graphene on a Si/SiO_{2} substrate by resistively detected electron spin resonance. Surprisingly, the magnetic moment and corresponding g factor of 1.952±0.002 is insensitive to charge carrier type, concentration, and mobility.

Diabetes-accelerated experimental osteoarthritis is prevented by autophagy activation.

OBJECTIVE: Type 2 Diabetes (T2D) is a risk factor for osteoarthritis (OA). Autophagy, an essential homeostasis mechanism in articular cartilage, is defective in T2D and OA. However, how T2D may influence OA progression is still unknown. We aimed to determine how diabetes affects cartilage integrity and whether pharmacological activation of autophagy has efficacy in diabetic mice (db/db mice) with OA. DESIGN: Experimental OA was performed in the right knee of 9 weeks-old C57Bl/6J male mice (Lean group, N = 8) and of 9 weeks-old B6.BKS (D)-Leprdb male mice (db/db group, N = 16) by transection of medial meniscotibial and medial collateral ligaments. Left knee was employed as control knee. Rapamycin (2 mg/kg weight/day) or Vehicle (dimethyl sulfoxide) were administered intraperitoneally three times a week for 10 weeks. Histopathology of articular cartilage and synovium was evaluated by using semiquantitative scoring and synovitis grading systems, respectively. Immunohistochemistry was employed to evaluate the effect of diabetes and Rapamycin on cartilage integrity and OA biomarkers. RESULTS: Cartilage damage was increased in db/db mice compared to Lean mice after experimental OA, while no differences are observed in the control knee. Cartilage damage and synovium inflammation were reduced by Rapamycin treatment of OA-db/db mice. This protection was accompanied with a decrease in MMP-13 expression and decreased interleukin 12 (IL-12) levels. Furthermore, autophagy was increased and cartilage cellularity was maintained, suggesting that mammalian target of rapamycin (mTOR) targeting prevents joint physical harm. CONCLUSION: Our findings indicate that diabetic mice exhibit increased joint damage after experimental OA, and that autophagy activation might be an effective therapy for diabetes-accelerated OA.

Atmospheric pressure X-ray photoelectron spectroscopy apparatus: Bridging the pressure gap.

One of the main goals in catalysis is the characterization of solid/gas interfaces in a reaction environment. The electronic structure and chemical composition of surfaces become heavily influenced by the surrounding environment. However, the lack of surface sensitive techniques that are able to monitor these modifications under high pressure conditions hinders the understanding of such processes. This limitation is known throughout the community as the "pressure gap." We have developed a novel experimental setup that provides chemical information on a molecular level under atmospheric pressure and in presence of reactive gases and at elevated temperatures. This approach is based on separating the vacuum environment from the high-pressure environment by a silicon nitride grid-that contains an array of micrometer-sized holes-coated with a bilayer of graphene. Using this configuration, we have investigated the local electronic structure of catalysts by means of photoelectron spectroscopy and in presence of gases at 1 atm. The reaction products were monitored online by mass spectrometry and gas chromatography. The successful operation of this setup was demonstrated with three different examples: the oxidation/reduction reaction of iridium (noble metal) and copper (transition metal) nanoparticles and with the hydrogenation of propyne on Pd black catalyst (powder).

Ecografía cutánea y rellenos dermatológicos / Cutaneous ultrasound and dermal fillers

En la consulta diaria, cada vez es más frecuente la demanda de los pacientes para la realización de rellenos o implantes dermatológicos, en relación con la corrección de arrugas superficiales o pliegues cutáneos marcados por el envejecimiento o bien para aumentar volúmenes en determinadas áreas (pómulos, labios, etc.). En muchas ocasiones somos nosotros, los dermatólogos, los primeros profesionales en realizar estos tratamientos, pero en otras los pacientes ya han sido tratados previamente, y son muchos los que ignoran el tipo de material que se les ha implantado o incluso niegan haber sido tratados con anterioridad, cuando en la exploración clínica se percibe lo contrario. Es en estas ocasiones cuando el desarrollo de la ecografía cutánea ha resultado ser una herramienta eficaz y fiable para poder realizar un diagnóstico en tiempo real sobre el tipo de relleno implantado, su localización y el estudio de posibles complicaciones que pudieran presentarse

Requests for fillers or dermatological implants have dramatically increased in dermatology consultations in the last few years, either for the correction of superficial age-related wrinkles and cutaneous creases or to increase the volume of specific areas (cheeks, lips...). Dermatologists are often the first professionals to provide these treatments. Nevertheless, in other situations, the patients have already been treated, and many of them do not know the type of material that has been implanted or may even deny previous treatment, even when evident on clinical examination. In these occasions, cutaneous ultrasound is an effective and reliable tool for the real-time diagnosis of the kind of implant that has been used, its location, and the study of its possible complications

[Cutaneous ultrasound and dermal fillers]. / Ecografía cutánea y rellenos dermatológicos.

Requests for fillers or dermatological implants have dramatically increased in dermatology consultations in the last few years, either for the correction of superficial age-related wrinkles and cutaneous creases or to increase the volume of specific areas (cheeks, lips...). Dermatologists are often the first professionals to provide these treatments. Nevertheless, in other situations, the patients have already been treated, and many of them do not know the type of material that has been implanted or may even deny previous treatment, even when evident on clinical examination. In these occasions, cutaneous ultrasound is an effective and reliable tool for the real-time diagnosis of the kind of implant that has been used, its location, and the study of its possible complications.

Regeneración ósea por medio de células madre en combinación con beta-fosfato tricálcico / Bone regeneration using stem cells in combination with beta-tricalcium phosphate carrier

Objetivo: Estudiar si las células madre adultas mesenquimales en combinación con beta-fosfato tricálcico contribuyen significativamente a la regeneración en una lesión ósea traumatizada. Material y método: Se utilizó un modelo de defecto traumático en el fémur de ratas Wistar (n=39). Fueron diseñados dos grupos: el grupo 1 (control), con nueve ratas a las que se les realizó un defecto óseo vacío; y el grupo 2 (experimental), con tres subgrupos de 10 ratas cada uno, a las que se les administró beta-fosfato tricálcico (β-TCP) y β-TCP en combinación con células madre mesenquimales (MSC). Se valoraron resultados a las tres, seis y nueve semanas de evolución, respectivamente. Resultados: Se observó el 65% de las fracturas en los fémures derechos de las ratas, que en grupo experimental corresponde a la zona donde se implanta el carrie en combinación con las MSC, aunque sólo el 35% de éstas coinciden exactamente con esta zona. No existen diferencias de comportamiento biológico significativas, aunque se demuestra actividad osteogénica. Conclusión: El uso de β-TCP en combinación con células estromales mesenquimales no genera resultados significativos en la regeneración ósea. Todavía es necesario potenciar la investigación en fase experimental (AU)

Objective: To study whether adult mesenchymal stem cells in combination with a carrier of beta-tricalcium phosphate contributes significantly in regenerating bone injury in traumatized. Material and method: A traumatic defect model on the femur was used in Wistar rats (n=38). Two groups were designed: the group 1 (control) with 9 rats to which they there was realized a bone defect empty fault, and the group 2 (experimental), with three subgroups (2a, 2b, 2c) of 10 rat each, which were administered the carrier beta-tricalcium phosphate (β-TCP), and β-TCP in combination with mesenchymal stem cells (MSC). Results were valued to 3, 6 and 9 weeks of evolution, respectively. Results: There were 65% of the fractures in the right femur of rats in the experimental group that corresponds to the area where the carrier is implanted in combination with the MSC, but only 35% of these coincide exactly with this area. No significant differences in biological behavior, although it shows osteogenic activity. Conclusion: The use of β-TCP carrier in combination with mesenchymal stromal cells does not produce significant results in bone regeneration. There is a need for further research in experimental phase (AU)

Controlling graphene plasmons with resonant metal antennas and spatial conductivity patterns.

Graphene plasmons promise unique possibilities for controlling light in nanoscale devices and for merging optics with electronics. We developed a versatile platform technology based on resonant optical antennas and conductivity patterns for launching and control of propagating graphene plasmons, an essential step for the development of graphene plasmonic circuits. We launched and focused infrared graphene plasmons with geometrically tailored antennas and observed how they refracted when passing through a two-dimensional conductivity pattern, here a prism-shaped bilayer. To that end, we directly mapped the graphene plasmon wavefronts by means of an imaging method that will be useful in testing future design concepts for nanoscale graphene plasmonic circuits and devices.

Supraglotoplastía asistida con microdebridador en pacientes con síndrome de Pierre Robin y laringomalacia severa / Assisted endoscopic microdebrider supraglottoplasty in patients with Pierre Robin syndrome and severe laryngomalacia

Se presenta el caso de una paciente recién nacida de término portadora de un síndrome de Pierre Robin asociada a laringomalacia severa que requirió resolución quirúrgica para estabilización de su vía aérea superior Se presenta la experiencia clínica en el uso de microdebridador para realización de supraglotoplastía como una novedosa alternativa en el tratamiento quirúrgico de este tipo de pacientes y se realiza revisión de la literatura respecto de esta técnica.

Pierre Robin syndrome is a triad formed by micrognathia, and cleft palate glossoptosis. His association with laryngomalacia is not set however determining the coexistence of these two diseases and their severity is of utmost importance as they condition the prognosis of a patient with Pierre Robin syndrome. Currently one of the surgical techniques used in patients with severe laryngomalacia, is assisted endoscopic microdebrider supraglottoplasty. In the ENT unit of the Hospital Luis Calvo Mackenna, this procedure is being implemented in order to give our patients a safe and effective treatment option for their pathology.

Tumores malignos de boca / Oral malignant tumors

Se revisan las principales neoplasias malignas de la cavidad oral con descripción de las características clínicas, diagnósticos diferenciales y tratamiento. Más del 90% de las neoplasias de la cavidad oral son carcinomas de células escamosas; están conformados por células escamosas planas que forman normalmente el revestimiento de la cavidad oral. Se denomina “carcinoma in situ” (forma temprana) cuando las células tumorales se encuentran dentro de la capa de revestimiento: el epitelio. El “carcinoma invasivo” implica una diseminación de dichas células hacia capas mas profundas de la boca. El carcinoma verrucoso es un tipo de carcinoma de células escamosas que puede representar hasta el 5% de los tumores de la cavidad oral. Es un cáncer de bajo grado que raramente metastatiza; pero puede extenderse hacia los tejidos circundantes. Es necesaria una extirpación con amplio margen de seguridad. Los carcinomas también pueden desarrollarse en las glándulas salivales menores que se encuentran en la mucosa de revestimiento. Existen varios tipos que incluyen el carcinoma adenoide quístico, carcinoma mucoepidermoide y el adenocarcinoma polimorfo de bajo grado. La lengua y la base de la misma contienen un sistema inmunológico que puede ser asiento de malignidad. Otros tumores menos frecuentes se describirán en esta presentación. El tratamiento y el pronóstico difieren según el tumor de origen (AU)

Its review the malign neoplasies principles in the oral cavity and it’s describe the clinics characteristics, the differential diagnosis and the treatment. More than 90% of cancers of the oral cavity are squamous cell carcinomas. Squamous cells are flat, scale-like cells that normally form the lining of the oral cavity. The earliest form of squamous cell cancer is called carcinoma in situ, meaning that the cancer cells are present only in the lining layer of cells called the epithelium. Invasive squamous cell cancer means that the cancer cells have spread beyond this layer into deeper layers of the oral cavity. Verrucous carcinoma is a type of squamous cell carcinoma that makes up less than 5% of all oral cavity tumors. It is a low-grade cancer that rarely metastasizes but can deeply spread into surrounding tissue. Therefore, surgical removal of the tumor with a wide margin of surrounding tissue is advised. Minor salivary gland cancers can develop in the glands that are found through out the mucosal lining. There are several types of minor salivary gland cancers including adenoid cystic carcinoma, mucoepidermoid carcinoma and polymorphous low-grade adenocarcinoma. The tonsils and base of tongue contain immune system (lymphoid) tissue that can develop into a cancer. There are other tumors that will be described in this article. The treatment and outlook for cure (prognosis) are different from different tumors (AU)

Gene expression profiles in a porcine model of infarction: differential expression after intracoronary injection of heterologous bone marrow mesenchymal cells.

Myocardial infarction is one of the main causes of mortality in developed countries. Injection of bone marrow mesenchymal stem cells (BMMSC) with the ability to regenerate lost cardiomyocytes is a promising therapy for heart failure. To evaluate this strategy, an in vivo porcine model of infarction was used. Gene expression profiles of 3 groups of pigs (n = 5 each) were analyzed and compared by real-time reverse transcription-polymerase chain reaction (RT-PCR). One of the groups underwent anterior descending coronary occlusion followed by BMMSC injection; a placebo group was injected with culture medium without cells after infarction; and a third group was formed by healthy pigs. Four weeks later, cells or medium was administered by intracoronary injection and, a month later, animals were sacrificed and samples collected. Genes related to cardiomyogenesis (Mef2C, Gata4, Nkx2.5), mobilization and homing of resident or circulating stem cells (Sdf1, Cxcr4, c-Kit), contractibility (Serca2a), and fibrosis (CollA1) were analyzed. Gene expression profiles changed in various heart areas in the 3 groups. Expression of genes related to cardiomyogenesis decreased in infarcted zones compared with homologous regions of healthy hearts. Sdf1 expression increased in the apex of infarcted hearts. Serca2a expression was reduced in the ventricles and atria of infarcted hearts. Also, increases in Cxcr4 and CollA1 expression were observed in infarcted hearts of cell-treated pigs compared with the placebo group. In conclusion, infarction induced changes in genes involved in various biological processes. Intracoronary injection of heterologous BMMSC resulted in localized changes in the expression of Cxcr4 and Col1A1.

Comparison of gene expression profiles in a porcine infarct model after intracoronary, transthoracic, or transendocardiac injection of heterologous bone marrow mesenchymal cells.

An in vivo porcine model of myocardial infarction was developed with the aim of comparing the effectiveness for cardiac repair of intracoronary, transthoracic, or transendocardial delivery strategies for bone marrow mesenchymal stem cells (BMMSC) using an analysis of expression levels of transcripts related to various cellular processes at 8 heart regions using quantitative reverse transcriptase polymerase chain reaction. We observed significant rises in cardiomyogenic markers Mef2C, Gata4 and Nkx2.5, and contractibility marker Serca2A at infarcted regions for cell-treated pigs. We also observed differences in Sdf1 expression related to the organ stress response between delivery strategies. Unexpectedly, increased expression of Col1A1 was detected in 2 cell-treated groups at various heart regions. Our results suggest improvements in both contractility and cardiomyogenic capability of damaged tissue after BMMSC injection, but also warned us about the relevance of the chosen delivery strategy and potential undesired effects like increasing fibrosis after treatment.

[Renal xenotransplant. Acute vascular rejection]. / Xenotrasplante renal. El rechazo vascular agudo.

INTRODUCTION AND OBJECTIVES: Organ transplant is nowadays a usual and succesful practice, although with limited application due to the lack of organs. Yearly thousands of patients get access to the waiting list and finally will death while they are waiting for an organ. In the U.S.A., 2005 waiting list for kidneys, heart, liver lung and pancreas was around 94.419. Number of transplants performed was 27.966 and died patients while waiting for an organ, 41.392 (1). Pig xenotransplant is one of the possibilities to ameliorate the lack of organs for transplant. Arrangement of pigs with different genetic modifications generated great expectatives on the use of these organs in clinics. Although preclinical experimental studies with kidneys reached prolonged survivals, these are really insufficient to go on with the clinical appliance. Hyperacute rejection produces destruction of the organ immediately. This problem could be pharmacologically precluded in xeno-transplant. However, acute rejection or vascular rejection usually produces the lost of the implant. New inmunosuppresive schedules delay significantly rejection, but not definitively. Xenotransplant as a therapeutic option introduces important scientific problems, as well as ethical and social. This paper reports a summary of our experience in renal xenotransplant and the management of acute rejection. MATERIAL AND METHODS: Twenty xenotransplants from transgenic pig (hDAF) as donor to babuine as receptor. Average weight of the animals ranged 11.4-75 kgrs and babuines 10-26 kg. Xenograft average weight ranged 39-160 grs. Implant was performed to aorta and cava. Four inmunosupressive schedules were used. RESULTS: Average survival was 7-9 days. Final Histological findings are described. Changes observed were secondary to acute tubular necrosis mixed with changes due to acute rejection. Three grafts were lost due to technical major problems. CONCLUSIONS: Although we have observed some promising results, xenotransplant is a very difficult problem to solve in the long-term. A lot of research is still needed-.

[Has the treatment of COPD changed in Spain? Results of a community multicenter study (VICE)]. / Ha cambiado el manejo de la EPOC en España? Resultados de un estudio multicéntrico comunitario (VICE).

INTRODUCTION: Many Clinical Practical Guides (CPG) that have specifically focused on the diagnosis and treatment of chronic obstructive pulmonary disease (COPD) have been elaborated over the last 5 years. However, their grade of application and effectiveness have not been verified. METHOD: In order to evaluate if the diagnosis and treatment of COPD have been modified in our setting since their publication, a comparative analysis was proposed between the results of the IDENTEPOC study (n = 898) conducted in the year 2000 and the VICE study (n = 10,782), whose data were collected in 2005. RESULTS: In the year 2000, 38.6% of the patients in primary health care were initially diagnosed of COPD using clinical and/or radiological criteria, with no functional confirmation versus 10.2% in the pneumology setting (p < 0.001). In 2005, 31% of the subjects had been diagnosed of COPD using spirometry in primary health care and 14% in pneumology did not show an obstructive pattern. In 2005, only 4.1% of the patients were receiving specific treatment for their smoking habit and the establishment of rehabilitation programs was not very relevant. No large differences in drug treatments were observed between both studies. The main difference in 2005 was a wide use of tiotropium and of combinations of beta2 agonists with inhaled corticosteroids. Although a mild escalation of treatment based on seriousness is observed in both series, the prescription guidelines do not adjust to the criteria established by the regulations. CONCLUSIONS: The results of this analysis indicate that although the CPGs may be useful tools to improve the clinical management of COPD, the absence of relevant qualitative changes in the management of COPD after their publication suggests that their impact in the clinical practice is currently irrelevant.