Influência da pós-carga sobre a taxa de variação da tensão desenvolvida (dT/dt). Estudo em músculo cardíaco isolado.

PURPOSE: To evaluate the effects of afterload on peak rate of tension rise (dT/dt) in the isolated muscle. METHODS: Left ventricular papillary muscles from Wistar rats were studied in isometric and isotonic afterloaded contractions. Muscles were analised in Krebs-Henseleit solution with calcium concentration of 2.52mM at 28 degrees C. The resting muscle length (preload) was maintained constant. The peak isometric developed tension (DT) and dT/dt were measured during increases of afterload (25, 50, 75 and 100% from DT). RESULTS: A rise in afterload corresponding to 50, 75 and 100% of DT, did not cause an increase in dT/dt values (p > 0.05). The dT/dt value decreased (p < 0.05) when afterload was changed from 75% to 25% of DT. CONCLUSION: The data suggest that an increase in the afterload from 50% of the DT did not promote changes in the dT/dt.

Efeito do Nível de Energia da Dieta e da Exposição Prévia ao Calor sobre a Respiração Mitocondrial do Músculo Cardíaco de Frangos de Corte

This work was conducted aiming to evaluate the effect of dietary energy level and the previous heat exposure on the respiratory activity of the mitochondria from the cardiac muscle of broiler chickens. It was used broiler chickens (Hubbard) from both sexes and fed with diet containing 2900 kcal ME/kg or 3200 kcal ME/kg. The birds were heat stressed (35°C/4h) in the 1 st, 21 st and 42 nd days of age. The respiratory activity of mitochondria from cardiac muscle was evaluated in a Gilson oxygraph, model 5/6, by using alpha-ceto-glutaric as substrate and the ADP (adenosine-di-phosphate) to stimulate the respiratory activity. There was not effect of dietary energy level and previous heat exposure on the respiratory activity of the mitochondria from cardiac muscle. However, the females presented higher respiratory activity than males. By reason of the low oxidative capability of the heart muscle fiber of the male broiler chickens, these could be more sensitive to cardiac disease than females.

Mensuração do tamanho cardíaco em radiografias de gatos com hipertireoidismo experimental

Feline hyperthyroidism (thyrotoxicosis) is now recognised as the most common endocrine disease of the domestic cat. Feline hyperthyroidism cause multisystemic disorder associated with incresead circulating concentrations of the thyroid hormones, tri-iodothyronine (T3) and thyroxine (T4). Cardiovascular abnormalities in cats with spontaneous hyperthyroid have been described. Objective to determine heart size of progressing experimental thyrotoxicosis of 19 cats, using a vertebral scale system (VHS). The lateral, dorsoventral e ventrodorsal radiographs thoracic were measured using a vertebral scale system. Lateral radiographs thoracic to efficient develop that DV and VD. The VHS method is easy to use, allows objective assesment of heart size in cats hyperthyroid, and may be helpful to identify cardiomegaly and heart size progressing.

Estímulo de la demanda, las inversiones y la aceleración del ritmo de crecimiento

Documento en inglés (88754) y también en: Gurrieri, Adolfo, comp.: La obra de Prebisch en la CEPAL. México, DF, Fondo de Cultura Económica, 1982, Tomo I, p. 394-423, Lecturas, No 46, (11934), ingresados en Biblioteca

Hemangiossarcoma cardíaco em cão: Relato de caso

Cardiac tumors are relatively rare in dogs, being hemangiosarcoma (HAS) the most common neoplasia. It consists in a primary, endothelial-originated neoplasia, which frequently compromises the right atrium. The pericardial effusion, frequently identified in dogs with heart HSA is responsible for the clinical signs, such as lethargy, exercise intolerance, dyspnea, and syncope. The diagnosis is difficult and suggested mainly by the clinic, hematologic, radiographic and echocardiographic findings, and was confirmed by histopathological examination. The present study aimed to report the presence of a heart HSA in a seven year old, spayed dog presented with signs of a congestive heart failure, due to the presence of a pericardial effusion secondary to tumor, and also lung, liver and spleen metastases. Despite this uncommon association a cardiac tumor should be suspected when signs of a heart failure, with rapid decline in the clinical status abruptly occurs.

A chuva no Distrito Federal: o regime e as excepcionalidades do ritmo

Pós-graduação em Geografia - IGCE

Influência do treinamento aeróbio periodizado em natação com ratos induzidos à obesidade exógena: estudo histomorfométrico do tecido cardíaco

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Papel das vias angiotensinérgicas no ventrículo cardíaco esquerdo de ratos submetidos à restrição proteica ou desnutrição gestacional

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência da inibição da NADPH oxidase sobre o redemodelamento cardíaco de ratos com diabetes mellitus

Pós-graduação em Fisiopatologia em Clínica Médica - FMB

Avaliação da função cardíaca em cães com anemia normovolência aguda experimental

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A influência do ritmo climático na morbidade respiratória em ambientes urbanos

Pós-graduação em Geografia - FCT

Avaliação de distribuição de doxorrubicina incorporada em microemulsão lipídica em tecido tumoral e cardíaco em Camundongos

Pós-graduação em Ciências Farmacêuticas - FCFAR

Estudo do ritmo do português brasileiro a partir da análise de processos fonológicos lexicais e pós-lexicais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Uma revisão da poesia de Péricles Eugênio da Silva Ramos: o ritmo como fator construtivo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo analítico do ritmo de piscar espôntaneo em cães adultos

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)