RESUMEN

Tungsten carbide-based composites are, in many cases, the materials of choice in applications requiring high wear resistance. In the present research work, the mechanical characterization of the WC-Co and WC-AISI 304 composites was carried out, with evaluation of the hardness and fracture toughness and tribological characterization of the composites that included the study of friction and wear rate coefficient through unlubricated sliding tests according to the Pin-on-Disc test method. It was possible to correlate the effect of the different binding phases on the mechanical and tribological properties of WC-based composites, and it can be concluded that the system composed by the tribological pair WC-AISI304/100Cr6 was the one that showed the lowest coefficient of friction while the tribological pair WC-Co/Al2O3 was the one that showed the lowest wear rate coefficient.

RESUMEN

Introduction: Cochlear damage is frequent in long-term aminoglycosides therapy or chemotherapeutic treatments with platinum-based agents. Despite its prevalence, it is currently underestimated and underdiagnosed. A monitoring protocol is vital to the early detection of cochleotoxicity and its implementation is widely encouraged in every hospital unit. Our aim was to elaborate a cochleotoxicity monitoring protocol for patients treated with platinum compounds or aminoglycosides antibiotics. Methods: PubMed® database was searched using terms relevant to drug cochleotoxicity in order to identify the most adequate protocol. Several articles and guidelines influenced our decision. Results: There is no consensus on a universal monitoring protocol. Its formulation and application rely heavily on available resources and personnel. High-frequency audiometry and otoacoustic emissions play an important role on early detection of cochleotoxicity caused by aminoglycoside antibiotics and platinum compounds. Conclusion: A cochleotoxicity monitoring protocol consisting on an initial evaluation, treatment follow-up and post-treatment evaluation is proposed (AU)

Introducción: El daño coclear es frecuente en la terapia de aminoglucósidos a largo plazo, o en tratamientos quimioterapéuticos con agentes a base de platino. A pesar de su prevalencia, actualmente está subestimado y subdiagnosticado. Un protocolo de monitorización es vital para la detección temprana de la ototoxicidad, por lo que se incita a su implementación en todas las unidades hospitalarias. Nuestro objetivo fue elaborar un protocolo de monitorización de la cocleototoxicidad para pacientes tratados con compuestos de platino o antibióticos aminoglucósidos. Métodos: Se realizaron búsquedas en la base de datos PubMed® utilizando términos relevantes para la cocleototoxicidad de los fármacos con el fin de identificar el protocolo más adecuado. Varios artículos y directrices influyeron en nuestra decisión. Resultados: No hay consenso sobre un protocolo de monitoreo universal. Su formulación y aplicación dependen en gran medida de los recursos y el personal disponibles. La audiometría de alta frecuencia y las emisiones otoacústicas desempeñan un papel importante en la detección temprana de la cocleototoxicidad causada por los antibióticos aminoglucósidos y los compuestos de platino. Conclusión: Se propone un protocolo de monitorización de la cocleototoxicidad, consistente en una evaluación inicial, seguimiento del tratamiento y evaluación postratamiento (AU)

Asunto(s)

RESUMEN

INTRODUCTION: Cochlear damage is frequent in long-term aminoglycosides therapy or chemotherapeutic treatments with platinum-based agents. Despite its prevalence, it is currently underestimated and underdiagnosed. A monitoring protocol is vital to the early detection of cochleotoxicity and its implementation is widely encouraged in every hospital unit. Our aim was to elaborate a cochleotoxicity monitoring protocol for patients treated with platinum compounds or aminoglycosides antibiotics. METHODS: PubMed® database was searched using terms relevant to drug cochleotoxicity in order to identify the most adequate protocol. Several articles and guidelines influenced our decision. RESULTS: There is no consensus on a universal monitoring protocol. Its formulation and application rely heavily on available resources and personnel. High-frequency audiometry and otoacoustic emissions play an important role on early detection of cochleotoxicity caused by aminoglycoside antibiotics and platinum compounds. CONCLUSION: A cochleotoxicity monitoring protocol consisting on an initial evaluation, treatment follow-up and post-treatment evaluation is proposed.

Asunto(s)

RESUMEN

Faz uma abordagem a respeito do pequeno número de pesquisas clínicas voltadas para a doença de Chagas que evidencia: é a enfermidade mais negligenciada. Há somente 10 ensaios clínicos em andamento no mundo, cinco no Brasil, um na Argentina, um na Colômbia e quatro nos Estados Unidos, ainda que a enfermidade afete 12 milhões de pessoas na América Latina, 4 milhões apenas no Brasil. Os dados foram apresentados pela diretoria do Instituto Oswaldo Cruz, Tânia Araújo-Jorge, na abertura do Simpósio Internacional Comemorativo do Centenário da Doença de Chagas, promovido pela Fiocruz entre 8 e 10 de julho. [AU]

Asunto(s)