RESUMO
Cardiac myxoma is a relatively rare tumour, usually solitary, that occurs primarily in the left atrium of adults, but comprises only 30% of cardiac tumours in children. We recently treated a 12-year-old girl with multiple recurrent myxomas in three cardiac chambers(following surgical resection 3 years earlier). Genomic analysis showed the PKAR1A mutation typical for Carney complex.
Assuntos
Complexo de Carney , Neoplasias Cardíacas , Mixoma , Adulto , Feminino , Criança , Humanos , Complexo de Carney/diagnóstico , Complexo de Carney/genética , Complexo de Carney/patologia , Neoplasias Cardíacas/diagnóstico por imagem , Neoplasias Cardíacas/cirurgia , Mixoma/diagnóstico , Mixoma/genética , Mixoma/cirurgia , Átrios do Coração/cirurgiaRESUMO
The interplay between a prosthetic and tissue represents an important factor for the fixation of orthopedic implants. Laser texturing tests and electropolishing were performed on two materials used in the fabrication of medical devices, i.e., CoCr and Ti6Al4V-ELI alloys. The material surface was textured with a diode-pumped solid state (DPSS) laser and its effect on the surface quality and material modification, under different combinations of laser power and marking speed, were investigated. Our results indicate that an increment of energy per unit length causes an incremental trend in surface roughness parameters. Additionally, phase transformation on the surface of both alloys was achieved. Chemical analysis by energy dispersive X-ray spectrometer (EDX) shows the formation of (Co(Cr,Mo)) phase and the M23C6 precipitate on the CoCr surface; while quantitative analysis of the X-ray diffractometer (XRD) results demonstrates the oxidation of the Ti alloy with the formation of Ti2O and Ti6O from the reduction of the α-Ti phase. The behaviors were both related with an increase of the energy per unit length. Control of the final surface roughness was achieved by an electropolishing post-treatment, minimizing the as-treated values. After polishing, a reduction of surface roughness parameters was obtained in a range between 3% and 44%, while no changes in chemical composition or present phases were observed.
RESUMO
Para contribuir al entendimiento de los mecanismos que acompañan las alteraciones masticatorias en pacientes con daño en el sistema nervioso central, se estudiaron en reflejo inhibitorio masetérico (RIM) y aspectos clínicos estomatológicos en 32 pacientes con diferentes tipos de parálisis cerebral (PC) en un rango de edad de 15 a 30 años. Se utilizó un modelo de regresión logística, la morfología refleja la distinción entre el tipo espástico y atetósico con una clasificación errónea de 31.35 por ciento (X2 =6.771, p=0.2382), con el conjunto de características cefalométricas, de la oclusión dental y de la articulación temporomandibular la distinción fue del 12.50 por ciento, (X2 =22.708, p=0.0453). A través del calculo de regresiones lineales, las condiciones estomatológicas y la edad explicaron las áreas inhibitorias faltantes (derecha e izquierda) y la razón de áreas (potenciación/inhibición) derecha con significancia estadística (p<0.05). Las variables clínicas con mayor poder de explicación respecto de los cambios reflejos fueron los contactos dentarios posteriores y anteriores (p<0.05). Se concluyó que los cambios en el tipo de PC no explican, por si mismos, los cambios del RIM y que estos últimos están asociados fundamentalmente con la disponibilidad de contactos dentarios. Se propone el registro del RIM con golpe al mentón para identificar la rapidez de la evolución de las secuelas masticatorias en pacientes con PC
Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto , Oclusão Dentária , Mastigação/fisiologia , Músculo Masseter/fisiopatologia , Paralisia Cerebral/fisiopatologia , Sistema Nervoso Central/patologia , Cefalometria , Inibição Neural/fisiologiaRESUMO
The ichthyoplanktonic community of Tamiahua Lagoon, Veracruz, Mexico, was studied throughout an annual cycle. Major concentrations of larvae occurred in the central portion of the lagoon, occasionally along the channels, but never at the inlets. The cycle of larva abundance was correlated with cycles of salinity and temperature. In spite of the greater number of species then, the spring and summer periods had low species diversity and evenness, due to the marked domination by larvae of Anchoa mitchilli. The number of larval fish species and individuals entering the lagoon from the adjacent offshore waters was minimal. The greatest portion of species diversity is generated within the lagoon itself. The community structure identified corresponds to the physically controlled type, as indicated by the poor diversity values obtained.