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Effect of hydration state on renal responses to head-out water immersion in conscious dogs. 1990

J L Sondeen, and S K Hong, and J R Claybaugh, and J A Krasney
Department of Physiology, State University of New York, Buffalo 14214.

Renal responses to head-out water immersion (WI) (37 degrees C, WI 100 min) were studied in conscious, instrumented dogs during volume repletion (R), when all blood and urine losses were replaced with 0.9% NaCl, or without volume repletion (NR), to determine the influence of hydration state. The lithium clearance method was used to estimate the locus of the renal tubular fractional sodium excretion (FENa) responses. WI in the R condition increased urine flow (V) from 0.9 (+/- 0.1 SE) to 4.2 (+/- 0.6) ml/min and FENa from 0.7 (+/- 0.1) to 3.2 (+/- 0.8)%. Fractional proximal sodium reabsorption (FPRNa) decreased from 0.82 (+/- 0.03) to 0.69 (+/- 0.1)% and fractional distal sodium reabsorption decreased from 0.96 (+/- 0.01) to 0.88 (+/- 0.04)%. By comparison, WI in the NR condition elicited smaller increments in V and FENa, no change in FPRNa and a significant decrease of FDRNa from 0.97 (+/- 0.01) to 0.93 (+/- 0.01). Although there were quantitative differences in the renal responses in the R and NR conditions, there were similar increments in both arterial and atrial pressures as well as plasma atrial natriuretic peptide concentration; plasma arginine vasopressin was unaltered in either situation, and plasma renin activity was depressed in both conditions. Since plasma protein concentration was significantly lower during the R condition, the differing renal responses are probably related to differing levels of volume expansion in the R vs. NR condition.

UI MeSH Term Description Entries
D007101 Immersion The placing of a body or a part thereof into a liquid. Submersion,Immersions,Submersions
D009318 Natriuresis Sodium excretion by URINATION. Natriureses
D009320 Atrial Natriuretic Factor A potent natriuretic and vasodilatory peptide or mixture of different-sized low molecular weight PEPTIDES derived from a common precursor and secreted mainly by the HEART ATRIUM. All these peptides share a sequence of about 20 AMINO ACIDS. ANF,ANP,Atrial Natriuretic Peptide,Atrial Natriuretic Peptides,Atriopeptins,Auriculin,Natriuretic Peptides, Atrial,ANF (1-126),ANF (1-28),ANF (99-126),ANF Precursors,ANP (1-126),ANP (1-28),ANP Prohormone (99-126),ANP-(99-126),Atrial Natriuretic Factor (1-126),Atrial Natriuretic Factor (1-28),Atrial Natriuretic Factor (99-126),Atrial Natriuretic Factor Precursors,Atrial Natriuretic Factor Prohormone,Atrial Natriuretic Peptide (1-126),Atrial Pronatriodilatin,Atriopeptigen,Atriopeptin (1-28),Atriopeptin (99-126),Atriopeptin 126,Atriopeptin Prohormone (1-126),Cardiodilatin (99-126),Cardiodilatin Precursor,Cardionatrin I,Cardionatrin IV,Prepro-ANP,Prepro-CDD-ANF,Prepro-Cardiodilatin-Atrial Natriuretic Factor,Pro-ANF,ProANF,Proatrial Natriuretic Factor,Pronatriodilatin,alpha ANP,alpha-ANP Dimer,alpha-Atrial Natriuretic Peptide,beta-ANP,beta-Atrial Natriuretic Peptide,gamma ANP (99-126),gamma-Atrial Natriuretic Peptide,Natriuretic Peptide, Atrial,Peptide, Atrial Natriuretic,Peptides, Atrial Natriuretic,Prepro ANP,Prepro CDD ANF,Prepro Cardiodilatin Atrial Natriuretic Factor,Pro ANF,alpha ANP Dimer,alpha Atrial Natriuretic Peptide,beta ANP,beta Atrial Natriuretic Peptide,gamma Atrial Natriuretic Peptide
D011188 Potassium An element in the alkali group of metals with an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and other cells. Potassium ion is a strong electrolyte that plays a significant role in the regulation of fluid volume and maintenance of the WATER-ELECTROLYTE BALANCE.
D001794 Blood Pressure PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS. Systolic Pressure,Diastolic Pressure,Pulse Pressure,Pressure, Blood,Pressure, Diastolic,Pressure, Pulse,Pressure, Systolic,Pressures, Systolic
D004231 Diuresis An increase in the excretion of URINE. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Diureses
D004242 Diving An activity in which the organism plunges into water. It includes scuba and bell diving. Diving as natural behavior of animals goes here, as well as diving in decompression experiments with humans or animals. Divings
D004285 Dogs The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065) Canis familiaris,Dog
D005440 Fluid Therapy Therapy whose basic objective is to restore the volume and composition of the body fluids to normal with respect to WATER-ELECTROLYTE BALANCE. Fluids may be administered intravenously, orally, by intermittent gavage, or by HYPODERMOCLYSIS. Oral Rehydration Therapy,Rehydration,Rehydration, Oral,Oral Rehydration,Rehydration Therapy, Oral,Therapy, Fluid,Therapy, Oral Rehydration,Fluid Therapies,Oral Rehydration Therapies,Oral Rehydrations,Rehydration Therapies, Oral,Rehydrations,Rehydrations, Oral,Therapies, Fluid,Therapies, Oral Rehydration
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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