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Respiratory function and carbonic anhydrase inhibition.

Abstract：

:Acetazolamide (Diamox) induced carbonic anhydrase inhibition is an efficient means of eliminating surplus water and bicarbonate in the overhydrated and alkalotic patient. Previous studies have demonstrated an unexpected and unexplained increase in arterial and venous oxygenation during acute carbonic anhydrase inhibition. In the present investigation we assessed the effect of acetazolamide 15 mg kg-1 on pulmonary gas exchange in 10 critically ill, mechanically ventilated patients. Median arterial oxygen tension increased by 0.9 kPa and central venous oxygen tension and content by 16-18% and 6-8% respectively. The improved oxygenation could, however, not be attributed to an improved pulmonary oxygen exchange as both pulmonary venous admixture (Qs Qt-1) and physiological dead space ventilation (VD VT-1) increased. The increase in arterial oxygen tension can be explained by a rightward shift of the oxyhemoglobin dissociation curve due to the increased acidity of the blood during carbonic anhydrase inhibition (Bohr effect). Acetazolamide does not depress oxygen consumption, so the increase in central venous oxygen content probably reflects an improved cardiac performance. This could conceivably be mediated via sympathetic activation in response to acetazolamide induced carbon dioxide retention.

journal_name

Intensive Care Med

journal_title

Intensive care medicine

authors

Berthelsen PG,Dich-Nielsen JO

doi

10.1007/BF00255787

subject

Has Abstract

pub_date

1987-01-01 00:00:00

pages

323-7

issue

5

eissn

0342-4642

issn

1432-1238

journal_volume

13

pub_type

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