Evolución de la producción científica generada sobre la dehiscencia del canal semicircular posterior / Evolution of the scientific production generated on posterior semicircular canal dehiscence

Introducción: La dehiscencia del canal semicircular posterior es una vestibulopatía rara, de baja prevalencia y cuya sintomatología se explica por el fenómeno de la tercera ventana. No fue hasta 2003 cuando Krombach describe los primeros casos. Objetivo: Evaluar mediante análisis bibliométrico y temático la producción científica sobre trabajos de dehiscencia del canal semicircular posterior (DCSP) y su incidencia a nivel de la comunidad científica mediante una revisión bibliográfica. Método: Se realiza búsqueda, revisión, selección y estudio a partir de ítems relacionados con DCSP indexados en la base de datos Pubmed, Web of Science, Alcorze y Scopus, desde el año 2003 hasta 2019, seleccionando 90 artículos. Resultados: Los 90 artículos han sido publicados en un total de 48 revistas, siendo 52% originales, 38% casos clínicos, 9% revisiones y 1% conferencias. La temática predominante fue la clínica (32%) y la etiología (27%). Los artículos estaban escritos en ocho idiomas diferentes, predominando el inglés (85%), y siendo Estados Unidos el país con más publicaciones (42%). Los índices de actividad institucional y autoría son bajos. La calidad de las revistas es alta, ya que el 70% de las publicaciones se encontraban en los cuartiles Q1-Q2. El área principal es Otorrinolaringología, con 66 trabajos, seguida por Radiología con 14. El número de descargas fue 6958, con una media de 77,31 por artículo, y las citaciones fueron 1193, equivalente a una media de 13,25. Conclusión: Los datos bibliométricos revelan cómo los trabajos sobre dehiscencia del canal semicircular posterior representan una pequeña producción científica, el tema está en fase de crecimiento sostenido, los índices de autoría, institucionalidad y colaboración son bajos y las publicaciones se concentran en pocas revistas, con una orientación claramente anglófona, pero de alta calidad e importante visualización. (AU)

Introduction: The dehiscence of the posterior semicircular canal is a rare vestibulopathy, of low prevalence and whose symptomatology is explained by the phenomenon of the third window. It was not until 2003 that Krombach described the first cases. Objective: Evaluate the scientific production about the dehiscence of the posterior semicircular canal (DCSP) by a bibliometric and thematic analysis and observes its incidence at the scientific community level. Method: A search with subsequent review, selection and study was carried out using items related to DCSP indexed in the Pubmed, Web of Science, Alcorze and Scopus databases, from 2003 to 2019, selecting a total of 90 articles. Results: The 90 articles have been published in a total of 48 magazines. 52% were originals, 38% clinical cases, 9% reviews and 1% conferences. Clinical (32%) and etiology (27%) were the main themes. The articles were written in eight different languages, predominantly English (85%), and the United States has been the country with the highest number of publications (42%). Institutional activity and authorship rates are low. The quality of the journals is high: 70% of the publications were in the Q1-Q2 quartiles. The main area corresponds to otorhinolaryngology, with a total of 66 works, followed by radiology (14). The total number of downloads was 6958, with an average of 77.31 per article and the total citations were 1193, 13.25 per article. Conclusions: The bibliometric results reveal how the works on dehiscence of the posterior semicircular canal present a small scientific production, the subject is in a phase of sustained growth, the authorship, institutional and collaboration index are low, the publications are concentrated in a few journals of high quality and important visualization, with a clearly anglophone orientation. (AU)

End-To-End Procedure For IORT in Brain Metastases and Film Dosimetry.

Purpose: The study is intended to perform an end-to-end test of the entire intraoperative process using cadaver heads. A simulation of tumor removal was performed, followed by irradiation of the bed and measurement of absorbed doses with radiochromic films. Materials and Methods: Low-energy X-ray intraoperative radiotherapy (IORT) was used for irradiation. A computed tomography study was performed at each site and the absorbed doses calculated by the treatment planning system, as well as absorbed doses with radiochromic films, were studied. Results: The absorbed doses in the organs at risk (OAR) were evaluated in each case, obtaining maximum doses within the tolerance limits. The absorbed doses in the target were verified and the deviations were <1%. Conclusions: These tests demonstrated that this comprehensive procedure is a reproducible quality assurance tool which allows continuous assessment of the dosimetric and geometric accuracy of clinical brain IORT treatments. Furthermore, the absorbed doses measured in both target and OAR are optimal for these treatments.

An innovative quick solidifying technique for the forensic investigation of brain circulation using addition silicones.

Post-mortem study of the brain is extremely relevant to medico-legal autopsies. However, it can be difficult to handle due to its fragility. This article presents a study on the development of an arterial solidifying technique that can be applied to analyze arterial circulation, consequently easing the handling and later diagnosis of diseases in this anatomical site. Vinylpolysiloxane silicone is introduced into the internal carotid arteries until it completely fills the arterial tree, creating a detailed model of the arterial's internal anatomy. This technique is fast, easy to apply and requires no previous tissue fixation. In addition, it allows for further toxicological and pathological tests. In conclusion, this technique represents a simple, sensitive and efficient method to employ in conventional autopsies, which can help in the diagnosis of death.

Are congenital malformations more frequent in fetuses with intrahepatic persistent right umbilical vein? A comparative study.

OBJECTIVE: Persistent right umbilical vein (PRUV) is a vascular anomaly where the right umbilical vein remains as the only conduit that returns oxygenated blood to the fetus. It has classically been described as associated with numerous defects. We distinguish the intrahepatic variant (better prognosis) and the extrahepatic variant (associated with worse prognosis). The objective of this study was to compare rates of congenital malformations in fetuses with intrahepatic PRUV (I-PRUV) versus singleton pregnancies without risk factors. MATERIALS AND METHODS: A multicenter, crossover design, comparative study was performed between 2003 and 2013 on fetuses diagnosed with I-PRUV (n=56), and singleton pregnancies without congenital malformation risk factors (n=4050). RESULTS: Fifty-six cases of I-PRUV were diagnosed (incidence 1:770). A statistically significant association between I-PRUV and the presence of congenital malformations (odds ratio 4.321; 95% confidence interval 2.15-8.69) was found. This positive association was only observed with genitourinary malformations (odds ratio 3.038; 95% confidence interval 1.08-8.56). CONCLUSION: Our rate of malformations associated with I-PRUV (17.9%) is similar to previously published rates. I-PRUV has shown a significant increase in the rate of associated malformations, although this association has only been found to be statistically significant in the genitourinary system. Noteworthy is the fact that this comparative study has not pointed to a significant increase in the congenital heart malformation rate. Diagnosis of isolated I-PRUV does not carry a worse prognosis.

[Ontogenic development of the incudostapedial joint]. / Desarrollo ontogénico de la articulación incudoestapedial.

OBJECTIVE: To study the development of the incudostapedial joint in human embryos and foetuses. MATERIAL AND METHOD: 46 temporal bones with specimens between 9 mm and newborns were studied. The preparations were sliced serially and dyed using the Martins trichrome technique. RESULTS: The incudostapedial joint takes on the characteristics of a spheroidal joint at 16 weeks of development. The cartilage covering the articular surfaces is formed by different strata that develop in succession: the superficial stratum at 19 weeks, the transitional between 20 and 23 weeks, and the radial from 24 weeks on. The subchondral bone develops after 29 weeks by the mechanisms of apposition and extension of the periosteal and endosteal bones, but it is not until week 34 that it completely covers the articular surfaces, following constitution of the bone fascicles transmitting the lines of force. The articular capsule is formed from the inter-zone, the surface zone develops the capsular ligament, and the internal surface develops the synovial membrane. CONCLUSIONS: At the time of birth, the incudostapedial joint is completely developed.

Desarrollo ontogénico de la articulación incudoestapedial / Ontogenic development of the incudostapedial joint

Objetivo: Estudiar el desarrollo de la articulación incudoestapedial en embriones y fetos humanos. Material y método: Se han estudiado 46 huesos temporale scon ejemplares comprendidos entre 9 mm y recién nacidos. Las preparaciones estaban cortadas en serie y teñidas con la técnica de tricrómico de Martins. Resultados: La articulación incudoestapedial adquiere las características de una articulación sinovial de tipo enartrosisa las 16 semanas de desarrollo. El cartílago que recubre las superficies articulares está formado por diferentes estratos que se desarrollan sucesivamente: el superficial, a las 19 semanas; el de transición, entre las 20 y las 23 semanas, y el radial, a partir de las 24 semanas. El hueso subcondral se desarrolla a partir de las 29 semanas por los mecanismos de aposición y extensión del periostal y el endostal, pero no es hasta la semana 34 cuando recubre por completo las superficies articulares, constituidos los fascículos óseos por los que se transmitirán las líneas de fuerza. La cápsula articularse forma a partir de la interzona, la zona superficial desarrolla el ligamento capsular y la interna, la sinovial. Conclusiones: En el momento del nacimiento la articulación incudoestapedial está completamente desarrollada (AU)

Objective: To study the development of the incudostapedial joint in human embryos and foetuses. Material and method: 46 temporal bones with specimens between 9 mm and new-borns were studied. The preparations were sliced serially and dyed using the Martins trichrome technique. Results: The incudostapedial joint takes on the characteristics of a spheroidal joint at 16 weeks of development. The cartilage covering the articular surfaces is formed by different strata that develop in succession: the superficial stratum at 19 weeks, the transitional between 20 and 23 weeks, and the radial from 24 weeks on. The subchondral bone develops after 29 weeks by the mechanisms of apposition and extension of the periosteal and endosteal bones, but it is not until week 34 that it completely covers the articular surfaces, following constitution of the bone fascicles transmitting the lines of force. The articular capsule is formed from the inter-zone, the surface zone develops the capsular ligament, and the internal surface develops the synovial membrane. Conclusions: At the time of birth, the incudostapedial joint is completely developed (AU)

[Connections between bone marrow and mesenchyme of the middle ear]. / Conexiones entre la médula ósea de los osículos y el mesénquima del oído medio.

OBJECTIVE: To investigate the presence of connections between the bone marrow of the ossicles and the mesenchyme that fills the future tympanic cavity. MATERIAL AND METHODS: Ninety temporal bones from embryos and foetuses were examined, selecting 15 aged between 20th to 30th weeks of development, to show connections between ossicle marrow and mesenchyme. RESULTS: The connections are transitory and appear in the malleus and the incus between 20th to 24th weeks of development, while in the stapes appear later, being between 24th to 28th weeks. CONCLUSIONS: These connections may have an important role in the phagocytosis of the mesenchymal remains and join in the detritus elimination mechanisms produced during the regression.

Conexiones entre la médula ósea de los osículos y el mesénquima del oído medio / Connections between bone marrow and mesenchyme of the middle ear

Objetivo: Determinar si existen conexiones entre la médula ósea de los osículos timpánicos y el mesénquima que rellena la futura cavidad timpánica. Material y métodos: Se han examinado 90 huesos temporales pertenecientes a embriones y fetos, y se han seleccionado 15 de edades comprendidas entre las semanas 20 y 30 del desarrollo al presentar conexiones entre médula del osículo y el mesénquima. Resultados: Las conexiones son de tipo transitorio y aparecen en el martillo y el yunque entre las semanas 20 y 24 de desarrollo, mientras que en el estribo se manifiestan posteriormente, entre las semanas 24 y 28. Conclusiones: Estas conexiones pueden tener un papel importante en la fagocitosis de los restos mesenquimales y sumarse a los mecanismos de eliminación de los detritus producidos durante la regresión

Objective: To investigate the presence of connections between the bone marrow of the ossicles and the mesenchyme that fills the future tympanic cavity. Material and methods: Ninety temporal bones from embryos and foetuses were examined, selecting 15 aged between 20th to 30th weeks of development, to show connections between ossicle marrow and mesenchyme. Results: The connections are transitory and appear in the malleus and the incus between 20th to 24th weeks of development, while in the stapes appear later, being between 24th to 28th weeks. Conclusions: These connections may have an important role in the phagocytosis of the mesenchymal remains and join in the detritus elimination mechanisms produced during the regression