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Gastrointestinal water and electrolytes. I. The equilibration of radiosodium in gastrointestinal contents and the proportion of exchangeable sodium (Nae) in the gastrointestinal tract



Gastrointestinal water and electrolytes. I. The equilibration of radiosodium in gastrointestinal contents and the proportion of exchangeable sodium (Nae) in the gastrointestinal tract



Journal of Clinical Investigation 35(5): 502-511



Forty rabbits of both sexes were fed on stock pellets to appetite or starved for up to 44 hr. before death. Each received an intraperitoneal injection of 100 to 150 micro C. 24NaCl in isotonic NaCl at pH 7. Urine and faeces were collected for 20 to 26 hr. and the rabbits were then killed and the contents of the digestive tract were recovered from separate segments. Total exchangeable Na was calculated to be 46.0 +or- 2.0 m. equiv. per kg. bodyweight. Of this 14.2 +or- 2.4 per cent. was in the digestive tract, 10.2 +or- 2.1 per cent. of it in the proximal half of the large intestine. Equilibrium of 24Na between the digestive tract and the body was complete within 24 hr. after injection. Fasting did not affect the results. The contents of the digestive tract were collected after death from 13 human subjects without oedema or organic gastro-intestinal disease. The interval after death was from 6 to 22 hr., and was not found to be related to the amount of Na recovered. Of the total exchangeable Na calculated according to age, sex and bodyweight, on the average 1.6 per cent., 0.54 m. equiv. per kg. bodyweight, was found in the digestive tract. Almost half was in the small intestine. It cannot be assumed that these values would be found in life.

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Accession: 049138903

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PMID: 13319485


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