Ventilation Perfusion Ratio
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Estudo dos efeitos da posição prona na distribuição regional da aeração e da perfusão pulmonar através da tomografia de impedância elétrica e da tomografia computadorizada multislice / Effects of prone position on regional distribution of lung aeration and perfusion. Analysis by electrical impedance tomography and computer tomography
Introdução: A utilização da posição prona melhora significativamente a oxigenação de pacientes com síndrome do desconforto respiratório agudo (SDRA). Estudos prévios sugerem que o recrutamento das regiões pulmonares colapsadas e pobremente aeradas é um dos possíveis mecanismos responsáveis pela melhora da oxigenação, no entanto, os mesmos ai
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/11/2011
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2. O desafio de diagnosticar tromboembolia pulmonar aguda em pacientes com doenças pulmonar obstrutiva crônica / The challenge of diagnosing acute pulmonary thromboembolism in patients with chronic obstructive pulmonary disease
Tromboembolia pulmonar aguda e exacerbação aguda de doença pulmonar obstrutiva crônica são doenças comuns. A doença pulmonar obstrutiva crônica é um fator clínico de risco para tromboembolia pulmonar aguda. As apresentações clínicas da tromboembolia pulmonar aguda e da exacerbação aguda da doença pulmonar obstrutiva crônica freqüentemente m
Publicado em: 2010
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3. Assessment of regional ventilatory dynamics in lung transplantation, using electrical impedance tomography / Análise regional da dinâmica ventilatória em transplante pulmonar com tomografia de impedância elétrica
INTRODUÇÃO: A monitorização da ventilação em transplante pulmonar depende de medidas estáticas e globais a partir de testes de função pulmonar e tomografia computadorizada, o que não é suficiente para detectar alterações regionais no parênquima pulmonar, que podem ser relevantes na avaliação de diferentes causas de comprometimento funcional.
Publicado em: 2010
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4. Mechanisms underlying gas exchange alterations in an experimental model of pulmonary embolism
The aim of the present study was to determine the ventilation/perfusion ratio that contributes to hypoxemia in pulmonary embolism by analyzing blood gases and volumetric capnography in a model of experimental acute pulmonary embolism. Pulmonary embolization with autologous blood clots was induced in seven pigs weighing 24.00 ± 0.6 kg, anesthetized and mecha
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-09
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5. Mecanismos que interferem no intercambio gasoso no tromboembolismo pulmonar experimental / Mechanisms underlying gas exchange alterations in an experimental model of pulmonary embolism
The literature broadly approaches the mechanisms responsible for the genesis of the hypoxemia in pulmonary embolism (PE). The aim of this study is to analyze the ventilation/perfusion ratio, which contributed to the hypoxemia in PE by analyzing blood gases and volumetric capnography in a model of experimental acute PE. Pulmonary embolization with autologous
Publicado em: 2006
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6. Síndrome hepatopulmonar: sobrevida e morbidade precoce e sobrevida a longo prazo após o transplante de fígado
Hepatopulmonary syndrome (HPS) is a clinical triad characterized by the presence of intrapulmonary vascular dilation (IPVD) and arterial hypoxemia with hepatic disease. Liver transplantation constitutes the only cure for HPS; possibly providing a complete reversal of the symptoms. However, an association between HPS and adverse results has been reported with
Publicado em: 2006
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7. Inert gas analysis of ventilation-perfusion matching during hemodialysis.
The mechanism of hypoxemia during hemodialysis was investigated by the multiple inert gas elimination technique in anesthetized, paralyzed, mechanically ventilated dogs. Profound leukopenia occurred in the first hour of a 2-h hemodialysis with a cuprophan membrane and dialysate that contained acetate. Arterial partial pressure of O2 and CO2 and oxygen consum
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8. Static and dynamic lung volumes and ventilation-perfusion abnormality in adult asthma
Dynamic lung volumes (forced vital capacity, forced expiratory volume in 0·5 second and in 1·0 second), static lung volumes (total lung capacity, functional residual capacity, residual volume), and ventilation-perfusion relationships (alveolar-arterial oxygen tension difference, alveolar dead space ventilation to tidal volume ratio, arterial oxygen and car
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9. Simple Method for Determination of Perfusion and Ventilation-Perfusion Ratio of the Underventilated Elements (the Slow Compartment) of the Lung*
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10. Regional structure-function correlations in chronic obstructive lung disease measured with positron emission tomography.
BACKGROUND: Positron emission tomography, performed with isotopes of very short half life, can be used to relate local lung tissue density to local ventilation and to the ventilation:perfusion ratio. This method has been used in 10 patients with severe chronic airflow obstruction and differing values for carbon monoxide transfer factor (TLCO) and transfer co
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11. Effects of posture on the distribution of pulmonary ventilation and perfusion in children and adults.
In the adult the distributions of ventilation and of perfusion show the same directional dependence on gravity. In children, however, the distribution of ventilation in response to gravity is the reverse of that seen in adults. The aim of the current study was to determine whether perfusion showed the same reversal in children or followed the adult pattern.
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12. Abnormal distribution of pulmonary blood flow in aortic valve disease: Relation between pulmonary function and chest radiograph
Wasted ventilatory volume (VD) and its ratio to tidal volume (VD/VT) were measured at rest and during exertion in 17 patients with aortic valve disease. We considered VD/VT to indicate abnormal ventilation: perfusion relations if it did not decrease on exertion, or if the exercising value was greater than 40 per cent. Plain chest radiographs were independent