Excreção renal de fósforo em cães nefropatas sob estimulação dopaminérgica
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Data
2010-06-01
Autores
Brum, Alexandre Martini de [UNESP]
Carvalho, Marileda Bonafim [UNESP]
Título da Revista
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Título de Volume
Editor
Universidade Federal de Santa Maria (UFSM)
Resumo
A dopamina possui um amplo espectro de ação no sistema urinário. Aumento da taxa de filtração glomerular, do fluxo sanguíneo renal e da excreção fracionada de sódio e fósforo é um efeito renal esperado em indivíduos normais. Este estudo foi realizado com o propósito de testar a hipótese de que a dopamina é capaz de aumentar a excreção fracionada de fósforo em cães nefropatas. Cinco cães sadios e quatro cães nefropatas, com doença predominantemente túbulo-intersticial, foram submetidos à infusão de solução controle (NaCl 0,9%) e solução de dopamina em duas taxas de infusão diferentes (1µg kg-1 min-1 e 3µg kg-1 min-1), sendo realizadas avaliações antes, durante e 30 minutos após a infusão. Os cães sadios apresentaram aumento significativo (P≤0,05) na excreção fracionada e excreção renal de fósforo durante a infusão de 3µg kg-1 min-1, porém a concentração sérica permaneceu sem alterações durante o tratamento. Já os cães nefropatas apresentaram aumento significativo (P≤0,05) na excreção fracionada e excreção renal de fósforo, tanto na dose de 1µg kg-1 min-1, como na de 3µg kg-1 min-1. Além disso, após a infusão de 1µg kg-1min-1, a concentração sérica de fósforo apresentou redução significativa. Os resultados são indicativos de que a dopamina nas doses de 1µg kg-1 min-1 e 3µg kg-1 min-1 podem ser incluídas na terapia de cães nefropatas para melhorar a homeostase de fosfato.
The dopamine has a wide spectrum of action on the urinary system. Increases in glomerular filtration rate, renal blood flow, sodium and phosphate fractioned excretion are renal effects expected in healthy people. Thus, this study was conducted in order to test the hypothesis that the dopamine is efficient to increase the fractioned excretion of phosphorus in nephropathic dogs. Five healthy dogs and four dogs nephropathic, predominantly with tubule-interstitial illness were submitted to a solution control infusion (NaCl 0.9%) and to a dopamine solution in two different rates of infusion (1µg kg-1min-1 and 3µg kg-1min-1) and were assessed before, during, and 30 minutes after the infusion. The healthy dogs presented a significant increase (P≤0.05) in the fractioned excretion and renal excretion of phosphate during the infusion of 3µg kg-1min-1, however, the seric concentration remained without alterations during the treatment. The nephropathic dogs presented a significant increase (P≤0,05) in the fractioned excretion and renal excretion of phosphate, in the 1µg kg-1 min-1, and in the 3µg kg-1 min-1 doses. Moreover, after the infusion of 1µg kg-1 min-1, the seric concentration of phosphate presented a significant reduction. The results indicate that the dopamine in the doses of 1µg kg-1 min-1 and 3µg kg-1 min-1 can be included in the intensive therapy of nephropathic dogs to improve the phosphate homeostasis.
The dopamine has a wide spectrum of action on the urinary system. Increases in glomerular filtration rate, renal blood flow, sodium and phosphate fractioned excretion are renal effects expected in healthy people. Thus, this study was conducted in order to test the hypothesis that the dopamine is efficient to increase the fractioned excretion of phosphorus in nephropathic dogs. Five healthy dogs and four dogs nephropathic, predominantly with tubule-interstitial illness were submitted to a solution control infusion (NaCl 0.9%) and to a dopamine solution in two different rates of infusion (1µg kg-1min-1 and 3µg kg-1min-1) and were assessed before, during, and 30 minutes after the infusion. The healthy dogs presented a significant increase (P≤0.05) in the fractioned excretion and renal excretion of phosphate during the infusion of 3µg kg-1min-1, however, the seric concentration remained without alterations during the treatment. The nephropathic dogs presented a significant increase (P≤0,05) in the fractioned excretion and renal excretion of phosphate, in the 1µg kg-1 min-1, and in the 3µg kg-1 min-1 doses. Moreover, after the infusion of 1µg kg-1 min-1, the seric concentration of phosphate presented a significant reduction. The results indicate that the dopamine in the doses of 1µg kg-1 min-1 and 3µg kg-1 min-1 can be included in the intensive therapy of nephropathic dogs to improve the phosphate homeostasis.
Descrição
Palavras-chave
phosphaturia, Dopamine, chronic renal failure, fosfatúria, Dopamina, Insuficiência renal crônica
Como citar
Ciência Rural. Universidade Federal de Santa Maria (UFSM), v. 40, n. 6, p. 1314-1320, 2010.