Renal response to acute acid loading--an organ physiological approach
OBJECTIVE: In previous studies of the renal response to acute NH4Cl acidosis no correlation was found between systemic acid-base status and the traditionally used quantity, renal net acid excretion (NAE). If NAE is to be considered a physiologically meaningful quantity then this is surprising, as th...
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ftsydanskunivpub:oai:sdu.dk:publications/ba0ce690-0667-11df-aefb-000ea68e967b 2024-04-21T07:59:35+00:00 Renal response to acute acid loading--an organ physiological approach Osther, P J Engel, K Kildeberg, P 2004 https://portal.findresearcher.sdu.dk/da/publications/ba0ce690-0667-11df-aefb-000ea68e967b https://doi.org/10.1080/00365590310018838 eng eng https://portal.findresearcher.sdu.dk/da/publications/ba0ce690-0667-11df-aefb-000ea68e967b info:eu-repo/semantics/restrictedAccess Osther , P J , Engel , K & Kildeberg , P 2004 , ' Renal response to acute acid loading--an organ physiological approach ' , Scandinavian Journal of Urology and Nephrology , vol. 38 , no. 1 , pp. 62-8 . https://doi.org/10.1080/00365590310018838 Acid-Base Equilibrium Acid-Base Imbalance Adaptation Physiological Ammonium Chloride Cross-Over Studies History 16th Century Humans Hydrogen-Ion Concentration Kidney Function Tests Male Reference Values Risk Assessment Sensitivity and Specificity Urinalysis article 2004 ftsydanskunivpub https://doi.org/10.1080/00365590310018838 2024-03-27T15:31:32Z OBJECTIVE: In previous studies of the renal response to acute NH4Cl acidosis no correlation was found between systemic acid-base status and the traditionally used quantity, renal net acid excretion (NAE). If NAE is to be considered a physiologically meaningful quantity then this is surprising, as the extracellular acid-base status would be expected to be the key physiological trigger for renal NAE. The object of this study was to investigate the renal response to acute non-carbonic acid loading using a quantitative organ physiological approach. MATERIAL AND METHODS: Five-h NH4Cl loading studies were performed in 10 healthy men using a randomized, placebo-controlled, crossover design. Arterialized capillary blood, serum and urine were collected hourly during the loading studies for the measurement of electrolytes and acid-base status. Concentrations of non-metabolizable base (NB) and acid (NA) were calculated from measured concentrations of non-metabolizable ions according to Kildeberg. RESULTS: In the steady state (placebo) the rate of renal excretion of NA (=-NB) was close to zero, indicating that the net extrarenal input of NA (endogeneous production, gastrointestinal absorption. skeletal release, etc.) was likewise about zero. An inverse correlation was found between blood pH and the rate of renal excretion of NA. Only a small amount of the acid load (approximately 8%) was excreted during the 5-h study period and this was accompanied by massive calciuria, indicating that mobilization of NB from bone contributed substantially to the current net extrarenal NA input. CONCLUSION: From a physiological point of view, NB can be regarded as the actual substrate for renal acid-base control, and measurement of renal turnover of NB may give a more precise description of renal acid-base metabolism during acid loading than previously described methods. Article in Journal/Newspaper Carbonic acid University of Southern Denmark Research Portal Scandinavian Journal of Urology and Nephrology 38 1 62 68 |
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Open Polar |
collection |
University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
topic |
Acid-Base Equilibrium Acid-Base Imbalance Adaptation Physiological Ammonium Chloride Cross-Over Studies History 16th Century Humans Hydrogen-Ion Concentration Kidney Function Tests Male Reference Values Risk Assessment Sensitivity and Specificity Urinalysis |
spellingShingle |
Acid-Base Equilibrium Acid-Base Imbalance Adaptation Physiological Ammonium Chloride Cross-Over Studies History 16th Century Humans Hydrogen-Ion Concentration Kidney Function Tests Male Reference Values Risk Assessment Sensitivity and Specificity Urinalysis Osther, P J Engel, K Kildeberg, P Renal response to acute acid loading--an organ physiological approach |
topic_facet |
Acid-Base Equilibrium Acid-Base Imbalance Adaptation Physiological Ammonium Chloride Cross-Over Studies History 16th Century Humans Hydrogen-Ion Concentration Kidney Function Tests Male Reference Values Risk Assessment Sensitivity and Specificity Urinalysis |
description |
OBJECTIVE: In previous studies of the renal response to acute NH4Cl acidosis no correlation was found between systemic acid-base status and the traditionally used quantity, renal net acid excretion (NAE). If NAE is to be considered a physiologically meaningful quantity then this is surprising, as the extracellular acid-base status would be expected to be the key physiological trigger for renal NAE. The object of this study was to investigate the renal response to acute non-carbonic acid loading using a quantitative organ physiological approach. MATERIAL AND METHODS: Five-h NH4Cl loading studies were performed in 10 healthy men using a randomized, placebo-controlled, crossover design. Arterialized capillary blood, serum and urine were collected hourly during the loading studies for the measurement of electrolytes and acid-base status. Concentrations of non-metabolizable base (NB) and acid (NA) were calculated from measured concentrations of non-metabolizable ions according to Kildeberg. RESULTS: In the steady state (placebo) the rate of renal excretion of NA (=-NB) was close to zero, indicating that the net extrarenal input of NA (endogeneous production, gastrointestinal absorption. skeletal release, etc.) was likewise about zero. An inverse correlation was found between blood pH and the rate of renal excretion of NA. Only a small amount of the acid load (approximately 8%) was excreted during the 5-h study period and this was accompanied by massive calciuria, indicating that mobilization of NB from bone contributed substantially to the current net extrarenal NA input. CONCLUSION: From a physiological point of view, NB can be regarded as the actual substrate for renal acid-base control, and measurement of renal turnover of NB may give a more precise description of renal acid-base metabolism during acid loading than previously described methods. |
format |
Article in Journal/Newspaper |
author |
Osther, P J Engel, K Kildeberg, P |
author_facet |
Osther, P J Engel, K Kildeberg, P |
author_sort |
Osther, P J |
title |
Renal response to acute acid loading--an organ physiological approach |
title_short |
Renal response to acute acid loading--an organ physiological approach |
title_full |
Renal response to acute acid loading--an organ physiological approach |
title_fullStr |
Renal response to acute acid loading--an organ physiological approach |
title_full_unstemmed |
Renal response to acute acid loading--an organ physiological approach |
title_sort |
renal response to acute acid loading--an organ physiological approach |
publishDate |
2004 |
url |
https://portal.findresearcher.sdu.dk/da/publications/ba0ce690-0667-11df-aefb-000ea68e967b https://doi.org/10.1080/00365590310018838 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Osther , P J , Engel , K & Kildeberg , P 2004 , ' Renal response to acute acid loading--an organ physiological approach ' , Scandinavian Journal of Urology and Nephrology , vol. 38 , no. 1 , pp. 62-8 . https://doi.org/10.1080/00365590310018838 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/ba0ce690-0667-11df-aefb-000ea68e967b |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1080/00365590310018838 |
container_title |
Scandinavian Journal of Urology and Nephrology |
container_volume |
38 |
container_issue |
1 |
container_start_page |
62 |
op_container_end_page |
68 |
_version_ |
1796940278511173632 |