Abstract:
OBJECTIVES:This study was conducted to quantitate and compare urinary solute transport by stomach and ileum using an in vivo rat model. METHODS:An artificial urine solution was perfused through isolated gastric and ileal segments in the anesthetized rat. Concentrations of solutes and a volume marker were periodically determined in the perfusate and net solute flux was calculated. RESULTS:The stomach secretes less sodium and very little bicarbonate in comparison with ileum. Hydrogen ion and chloride are absorbed by ileum but secreted in large quantities by the stomach. Ammonium, potassium, and urea are absorbed by both segments but to a much lesser degree in the stomach. Overall, there was a net osmolar absorption by ileum, and a net secretion by the stomach. Both segments secrete water to a similar degree. CONCLUSIONS:These findings both suggest the mechanism of the hypochloremic metabolic alkalosis seen after urinary reconstruction with the stomach and provide insight into potential therapeutic approaches. Solute fluxes in both the stomach and the ileum are consistent with the known physiology of these segments.
journal_name
Urologyjournal_title
Urologyauthors
Brandell RA,Scaletscky R,Koch MOdoi
10.1016/s0090-4295(94)80091-xsubject
Has Abstractpub_date
1994-09-01 00:00:00pages
343-7issue
3eissn
0090-4295issn
1527-9995pii
S0090-4295(94)80091-Xjournal_volume
44pub_type
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