Biocerâmica de fosfato de cálcio nanoestruturada micro-macroporosa em grânulos de absorção rápida no preenchimento de defeito crítico em rádio de coelhos (Oryctolagus cuniculus) / Bioceramics of calcium phosphate nano-structured micro-macro porous granules rapidly absorbed in filling critical radial defect in rabbits (Oryctolagus cuniculus)

O objetivo do presente trabalho foi avaliar, por radiografia, histologia e densitometria óssea, o efeito da HA/ßTCP em grânulos de absorção rápida em defeito ósseo crítico em rádio de coelhos. Foram utilizados 35 coelhos machos, da raça Nova Zelândia, e realizou-se um defeito crítico nos rádios direito e esquerdo. Os animais foram distribuídos em GI, enxerto autólogo e GII, HA/ßTCP em grânulos de absorção rápida. Avaliações radiográficas foram feitas antes da cirurgia, após, aos oito, 15, 30, 45 e 60 dias e avaliações histológicas e de densitometria. Verificou-se diferença significativa ao se comparar a densidade mineral óssea obtida ao longo do tempo de estudo. Observou-se formação de rede vascular entre os poros da biocerâmica desde o primeiro tempo de avaliação, (oito dias). Foram observados tecido ósseo primário e trabéculas em tecido ósseo preexistente a partir de 30 dias da implantação. Aos 60 dias, constatou-se presença de matriz óssea em segmentos ósseos preexistentes, caracterizando a formação óssea centrípeta. A biocerâmica HA/ßTCP nanoestruturada micro-macroporosa em grânulos de absorção rápida não causa alterações microscópicas indicativas de rejeição, permite a invasão e a multiplicação celular, bem como propicia a regeneração óssea, constituindo um implante apropriado para preenchimento de falhas ósseas críticas.(AU)

The objective of this study was to evaluate the effect of HA/ ßTCP on rapid absorption granules in rabbit radiography, histology, and bone densitometry. Thirty - five male rabbits of the New Zealand breed were used and a critical defect was performed on the right and left radios. The animals were distributed in GI, autologous graft and GII HA / ßTCP in rapidly absorbed granules. Radiographic, histological, and densitometry evaluations were performed before surgery, then after eight, 15, 30, 45 and 60 days. A significant difference was found when comparing the bone mineral density obtained over the study time. Formation of vascular network between the bioceramic pores was observed by the first evaluation time, (eight days). Primary bone tissue and trabeculae were observed from preexisting bone tissue after 30 days of implantation. At 60 days, the presence of bone matrix was observed from the preexisting bone segments, characterizing the centripetal bone formation. The micro-macroporous nanocomposite HA / ßTCP of rapidly absorbing granules do not cause microscopic changes indicative of rejection, allows invasion, cell multiplication, and promotes bone regeneration, constituting an appropriate implant for filling of critical bone failures.(AU)

Avaliação histológica e por microscopia eletrônica de varredura da biocerâmica de fosfato de cálcio nano-estruturada micromacro porosa em grânulos em defeito crítico de rádio de coelhos / Histological and nano-structured calcium phosphate bioceramic micro-macro porous granules in critical defect rabbits radius scanning electron microscopy evaluation

Objetivou-se avaliar, histologicamente e por microscopia eletrônica de varredura (MEV), a evolução de defeitos críticos experimentais em rádio de coelhos preenchidos ou não com biocerâmica fosfocálcica nanoestruturada micromacro porosa em grânulos. Utilizaram-se 70 coelhos, Nova Zelândia, adultos jovens, machos, e realizou-se um defeito crítico nos rádios. Os membros constituíram os grupos: GI, biocerâmica lenta, GII, biocerâmica moderada e GIII, controle negativo. Após cada período experimental, os animais foram sacrificados, e os rádios coletados. As avaliações histológicas foram realizadas aos oito, 15, 30, 45, 60, 90 e 120 dias, e as análises de MEV aos 60, 90 e 120 dias. Histologicamente, observou-se processo de reparação óssea mais adiantado nos grupos GI e GII comparando-se ao GIII. Na MEV, constatou-se maior proporção de osso maduro e presença de ósteons secundários nos GI e GII, sendo mais evidente no GII, confirmando os achados histológicos. As cerâmicas promoveram preenchimento completo do defeito, enquanto no grupo controle houve preenchimento no centro do defeito, permanecendo espaços vazios nas laterais. Conclui-se que o emprego das biocerâmicas de absorção lenta e moderada favorece a regeneração óssea completa em defeitos críticos sendo indicadas como substituto ósseo. A maturação óssea ocorre mais precocemente quando se emprega a cerâmica de absorção moderada.(AU)

The objective was to evaluate, through histologic exam and by scanning electron microscopy (SEM), the evolution of experimental critical defects in radio or not filled with nano-structured calcium phosphate micro-macro porous bioceramic granules rabbits. We used 70 rabbits, New Zealand, young adults, males, there was a critical defect in radio. The members were the groups: GI, slow bioceramic, GII, GIII and bioceramic moderate, negative control. After each experimental period, the animals were sacrificed and the radios harvested. Histological evaluations were performed at eight, 15, 30, 45, 60, 90 and 120 days and SEM analyzes at 60, 90 and 120 days. Histologically there was bone healing process earlier in GI and GII compared to GIII. In SEM we observed a higher proportion of mature bone and presence of secondary osteons in GI and GII, being more evident in the GII, confirming the histological findings. Ceramic promoted complete filling of the defect, while the control group was filling in the center of the defect, with empty spaces remaining on the sides. In conclusion, the use of bioceramics, slow and moderate absorption favor complete bone regeneration in critical defects being indicated as a bone substitute. The maturation occurs earlier when employing the ceramic moderate absorption.(AU)

Impact of marked weight loss induced by bariatric surgery on bone mineral density and remodeling

Data about the impact of bariatric surgery (BS) and subsequent weight loss on bone are limited. The objective of the present study was to determine bone mineral density (BMD), bone remodeling metabolites and hormones that influence bone trophism in premenopausal women submitted to BS 9.8 months, on average, before the study (OGg, N = 16). The data were compared to those obtained for women of normal weight (CG, N = 11) and for obese women (OG, N = 12). Eight patients in each group were monitored for one year, with the determination of BMD, of serum calcium, phosphorus, magnesium, parathyroid hormone, 25-hydroxyvitamin D, insulin-like growth factor-I (IGF-I) and osteocalcin, and of urinary calcium and deoxypyridinoline. The biochemical determinations were repeated every three months in the longitudinal study and BMD was measured at the end of the study. Parathyroid hormone levels were similar in the three groups. IGF-I levels (CG = 332 ± 62 vs OG = 230 ± 37 vs OGg = 128 ± 19 ng/mL) were significantly lower in the operated patients compared to the non-operated obese women. Only OGg patients presented a significant fall in BMD of 6.2 percent at L1-L4, of 10.2 percent in the femoral neck, and of 5.1 percent in the forearm. These results suggest that the weight loss induced by BS is associated with a significant loss of bone mass even at sites that are not influenced by weight overload, with hormonal factors such as IGF-I being associated with this process.

Health in early adulthood: the contribution of the 1978/79 Ribeirão Preto birth cohort

The increase in non-communicable chronic diseases of adults is due to demographic changes and changes in the risk factors related to physical activity, smoking habits and nutrition. We describe the methodology for the evaluation of persons at 23/25 years of age of a cohort of individuals born in Ribeirão Preto in 1978/79. We present their socioeconomic characteristics and the profile of some risk factors for chronic diseases. A total of 2063 participants were evaluated by means of blood collection, standardized questionnaires, anthropometric and blood pressure measurements, and methacholine bronchoprovocation tests. The sexes were compared by the chi-square test, with alpha = 0.05. Obesity was similar among men and women (12.8 and 11.1 percent); overweight was almost double in men (30.3 vs 17.7 percent). Weight deficit was higher among women than among men (8.6 and 2.6 percent). Women were more sedentary and consumed less alcohol and tobacco. Dietary fat consumption was similar between sexes, with 63 percent consuming large amounts (30 to 39.9 g/day). Metabolic syndrome was twice more frequent among men than women (10.7 vs 4.8 percent), hypertension was six times more frequent (40.9 vs 6.4 percent); altered triglyceride (16.1 vs 9.8 percent) and LDL proportions (5.4 vs 2.7 percent) were also higher in men, while women had a higher percentage of low HDL (44.7 vs 39.5 percent). Asthma and bronchial hyper-responsiveness were 1.7 and 1.5 times more frequent, respectively, among women. The high prevalence of some risk factors for chronic diseases among young adults supports the need for investments in their prevention.

Visceral leishmaniasis in Teresina, state of Piauí, Brazil: preliminary observations on the detection and transmissibility of canine and sandfly infections

A Leishmania donovani-complex specific DNA probe was usedto confirm the widespread dissemination of amastigotes in apparently normal skinof dogs with canine visceral leishmaniasis. When Lutzomyia longipalpis were fed on abnormal skin of five naturally infected dogs 57 of 163 (35 per cent) fliesbecame infected: four of 65 flies (6 per cent) became infected when fed on apparently normal skin. The bite of a single sandfly that had fed seven days previouslyon a naturally infected dog transmitted the infection to a young dog from a non-endemic area. Within 22 days a lesion had developed at the site of the infectivebite (inner ear): 98 days after infection organisms had not disseminated throughout the skin, bone marrow, spleen or liver and the animal was still serologically negative by indirect immunofluorescence and dot-enzyme-linked immunosorbent assay. When fed Lu. longipalpis were captured from a kennel with a sick dog known to be infected, 33 out of 49 (67 per cent) of flies contained promastigotes. In contrast only two infections were detected among more than 200 sandflies captured in houses. These observations confirm the ease of transmissibility of L.chagasi from dog to sandfly to dog in Teresina. It is likely that canine VL is the major source of human VL by the transmission route dog-sandfly-human. the Lmet2 DNA probe was a useful epidemiological tool for detecting L. chagasi in sandflies

Efecto del carcinogeno dimetilnitrosamina sobre el rinon del vison / Efect of carcinogen dimethylnitrasamine on the kidney of mink

Visones de un criadero que recibian alimentos, sobre la base de restos de pescado, evidenciaron un significativo aumento en su mortalidad, presencia de canceres hepaticos y alteraciones renales revelables histologicamente. Esos efectos fueron atribuibles a presencia, en el alimento, de dimetilnitrosamina (NDMA), en concentraciones 1,8 ug/g. En este trabajo se estudia en detalle el efecto de la NDMA sobre el rinon del vison. Visones que fueron tratados ip con NDMA(7 mg/kg en sol. fis.), mostraron dano evidenciable ultraestructuralmente en la corteza renal. El dano fue mayor en los tubulos proximales, que en los distales, pero era de naturaleza similar. Las celulas epiteliales tubulares de los animales intoxicados mostraron: a)Condensacion de la cromatina nuclear y dilatacion de la membrana perinuclear. b)Marcada hinchazon mitocondrial y ruptura de sus crestas con perdida de contenida de la matriz mitocondrial. c)Despegue de ribosomas y dilatacion del reticulo endoplasmico. d)Aumento del numero y tamano de las vacuolas autofagicas. e)Aparicion de gotas lipidicas en el citiplasma. En contraste con lo previamente establecido, para el caso de cancer hepatico del vison, el mecanismo del dano renal por NDMA no se pudo correlacionar directamente con la union de metabolitos reactivos de esta a proteinas o acidos nucleicos o la biotransformacion microsomal o mitocondrial de la NDMA o formaldehido. No obstante, el rinon biotransforma la NDMA a CO2, pero lo hace 3-4 veces menos intensamente que el rinon de rata. Los resultados sugeririan la presencia, en el caso del dano renal por NDMA, de mecanismos distintos de accion, a los habitualmente aceptados como responsables del dano hepatico o el renal en otras especies. Alternativamente, el dano renal puede deberse a dano hepatico concomitante

Pasaje del antichagásico Benznidazol vía leche materna a ratas lactantes: efectos sobre el metabolismo de xenobióticos / Passage of Benznidazol antichagasics ingestion maternal milk to neonatal rats: effects on xenobiotic metabolism

El antichagásico Benznidazol presenta efectos tóxicos indeseables en su empleo clínico. Esta droga es capaz de pasar al lactante vía leche materna modificando su capacidad metabolizante de xenobióticos. En ratas lactantes cuyas madres fueron tratadas previamente con la droga el tiempo de sueño producido por pentobarbital fue modificado, así como también la actividad de la aminopirina demetilasa, que fue significativamente menor que en ratas lactantes control.

Distribución del benznidazol administrado oralmente en los diferentes tejidos de ratas macho / Concentration of oral administered benznidazol in the different tissues of male rats

Una hora después de administrar oralmente [14C]-Benznidazol (Bz) a ratas macho de la cepa Sprague-Dawley, se observa concentraciones máximas de la droga en los diferentes tejidos. A partir de este período y hasta las 24 horas hay una disminución progresiva en la concentración de Bz en los órganos observados con excepción del intestino grueso. El hígado, el estómago y el riñón presentan las concentraciones más altas de Bz 1 hora después de su administración y el tejido adiposo la más baja. Todos los demás órganos tienen concentraciones similares a las observadas en sangre

Manifestacoes endocrinologicas secundarias ao granuloma eosinofilo. / Endocrinological manifestations secondary to eosinophilic granuloma

Relata-se o caso de uma paciente portadora de granuloma eosinofilo multifocal, cujo acometimento hipotalamico levou ao desenvolvimento de diabete insipido e de um quadro complexo de endocrinopatias expresso por amenorreia, hiperprolactinemia,obesidade, bem como resposta deficiente do hormonio de crescimento a estimulacao e hiperinsulinemia, alteracoes estas extremamente incomuns nesta doenca

Caracteristicas clinicas e laboratoriais das doencas da tiroide. / Clinical and laboratorial characteristics of thyroid diseases

Os autores analisam prospectivamente caracteristicas clinicas e laboratoriais dos diferentes tipos de doencas da tiroide, observadas em 256 pacientes atendidos no Servico de Endocrinologia do Hospital de Clinicas de Porto Alegre, no periodo compreendido entre fevereiro de 1978 a marco de 1979. Constatam que as doencas de tiroide mais frequentemente encontradas foram o bocio atoxico e o hipertiroidismo, os quais ocorreram respectivamente em 50 e 26% dos pacientes. Com base nos resultados, afirmam que os bocios nodulares constituiram a causa mais frequente de hipertiroidismo, e que o carcinoma folicular foi a neoplasia mais prevalente, ressaltando que estes achados tem sido descritos em pacientes provenientes de areas deficientes de iodo. Sugerem que, em nosso meio, a deficiencia do iodo, alem de ter um papel preponderante na genese das doencas de tiroide, modifica significativamente as formas de apresentacao de algumas delas, em especial do hipertiroidismo e do carcinoma. Enfatizam, finalmente, a necessidade da realizacao de estudos futuros, de carater epidemiologico e mais abrangentes, atraves dos quais seja possivel determinar objetivamente o grau de deficiencia de iodo, a prevalencia de bocios e os diferentes tipos de doencas da tiroide, peculiares as diversas regioes do Estado do Rio Grande do Sul

Cirurgia de tiroide: o autotransplante de paratireoide para evitar o hipoparatireoidismo. / Thyroid surgery: the autotransplantation of parathyroid for the prevention of hypoparathyroidism

E feita da literatura sobre o autotransplante de paratiroide e os autores sugerem a utilizacao deste procedimento para evitar o hipoparatireoidismo pos-tireoidectomias totais

Esfinteroplastia del Oddi.Experiencia del Hospital General GMN y revision bibliografica. / Oddi's sphincteroplasty. Experience of the Hospital General CMN and bibliographic review

Se revisa la experiencia del Servicio de Cirugia del Hospital General del Centro Medico Nacional de el Instituto Mexicano del Seguro Social, en relacion con la indicacion, aplicacion y resultados obtenidos con la esfinteroplastia del Oddi, en el lapso de 1975 a 1979. Se completa esta revision con la experiencia de otros autores. Se efectua un analisis comparativo y se proponen conclusiones