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Am J Physiol 205: 693-696, 1963;
0002-9513/63 $5.00
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Effect of carbonic anhydrase inhibition on proximal tubular bicarbonate reabsorption

James R. Clapp 1, John F. Watson 1, and Robert W. Berliner 1

1 Laboratory of Kidney and Electrolyte Metabolism, National Heart Institute, Bethesda, Maryland

Samples of fluid from the proximal tubule were collected for the measurement of pH and bicarbonate concentration before and after the administration of acetazolamide (Diamox). Samples collected before acetazolamide were consistently more acid than plasma with the most acid samples coming from the more distal portion of the proximal tubule. After the intravenous administration of acetazolamide, the pH and bicarbonate concentration were consistently higher than in plasma. Bicarbonate concentrations as high as 2.8 times that in plasma were observed. The rise in proximal tubular fluid bicarbonate concentration after acetazolamide is presumably due to a reduction in the rate of bicarbonate reabsorption out of proportion to any impairment in proximal tubular fluid volume reduction.

Key Words: urine acidification • pH

Submitted on May 6, 1963




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