Augmentation of Peripheral Chemosensitivity during Hypermetabolism (Paperback)

Idioma: inglés

Editorial: Dissertation.com, Florida, 2006

1581123272 / 9781581123272

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Paperback. The carotid body initiates reflexes aimed principally at the homeostatic maintenance of blood gas tensions. This thesis tested the hypothesis that the carotid body is also a physiological glucosensor, with a role in mediating exercise hyperpnoea. In anaesthetised rats, insulin-induced hypoglycaemia (from ca. 6.5 to 2.8 mmol L-1) caused an ca. two-fold increase of oxygen consumption that was associated with a significant, carotid body-dependent increase in ventilation (from ca. 420 to 640 ml min-1 kg-1) without change in blood gas tensions. This hypoglycaemic hyperpnoea was associated with hypokalaemia and no alterations of ventilation or metabolism were observed in euglycaemic, control studies, thus excluding any role for [K]] or insulin. During hypermetabolism, a proportional augmentation of peripheral CO2 gain, measured from the phrenic electroneurogram during artificial ventilation, was shown to maintain the arterial blood gas status. In vitro, measurements of single-fibre chemoafferent discharge showed that low [glucose], over a physiological range and during normoxia, increased neither the carotid baseline discharge nor the CO2 sensitivity. Taken together, these results demonstrate that the carotid body is not a physiological sensor of glucose but augmentation of the carotid body chemosensitivity via an undetermined yet, hypermetabolism-related factor(s) is most likely to be involved in exercise hyperpnoea. The carotid body initiates reflexes aimed principally at the homeostatic maintenance of blood gas tensions. This thesis tested the hypothesis that the carotid body is also a physiological glucosensor, with a role in mediating exercise hyperpnoea. In anaesthetised rats, insulin-induced hypoglycaemia (from ca. 6.5 to 2.8 mmol L-1) caused an ca. two-fold increase of oxygen consumption that was associated with a significant, carotid body-dependent increase in ventilation (from ca. 420 to 640 ml min-1 kg-1) without change in blood gas tensions. This hypoglycaemic hyperpnoea was associated with hypokalaemia and no alterations of ventilation or metabolism were observed in euglycaemic, control studies, thus excluding any role for [K+] or insulin. During hypermetabolism, a proportional augmentation of peripheral CO2 gain, measured from the phrenic electroneurogram during artificial ventilation, was shown to maintain the arterial blood gas status. In vitro, measurements of single-fibre chemoafferent discharge showed that low [glucose], over a physiological range and during normoxia, increased neither the carotid baseline discharge nor the CO2 sensitivity. Taken together, these results demonstrate that the carotid body is not a physiological sensor of glucose but augmentation of the carotid body chemosensitivity via an undetermined yet, hypermetabolism-related factor(s) is most likely to be involved in exercise hyperpnoea. Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…

N° de ref. del artículo 9781581123272

Título
Augmentation of Peripheral Chemosensitivity during Hypermetabolism (Paperback)
Autor
Ismaeel M. Bin-Jaliah
Editorial
Dissertation.com, Florida
Año de publicación
2006
Estado
new
Encuadernación
Paperback
Idioma
inglés
ISBN 10
1581123272
ISBN 13
9781581123272

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ArtículoDe 25 a 45 días hábilesDe 8 a 14 días hábiles
Primer artículoEUR 33,16EUR 39,44
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