A mechanism of hypoxemia during hemodialysis: Consumption of CO2 in metabolism of acetate

Man S. Oh, Jaime Uribarri, Mary L. Del Monte, William F. Heneghan, Choon S. Kee, Eli A. Friedman, Hugh J. Carroll

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25 Scopus citations

Abstract

The present study is an investigation of the role of acetate metabolism in dialysis-induced hypoxemia and of the relative roles of acetate metabolism, bicarbonate loss, and CO2 gas (g) loss in causation of hypoxemia. The loss of CO2 (g) measured in 23 patients during acetate dialysis was found to be negligible (0.21 ± 0.01 mmol/min). The HCO3- loss was substantial (3.4 ± 0.5 mmol/min), but its predicted effect on dialysis hypoxemia was modest. The infusion of acetate at 4 mmol/min into 6 normal volunteers decreased the respiratory exchange ratio (R) from 0.83 ± 0.06 to 0.71 ± 0.06 with constant O2 consumption (V˙O2) and reduced net CO2 production (V˙CO2). In another experiment, the infusion of sodium acetate into 9 normal volunteers resulted in a similar reduction in R (from 0.82 ± 0.04 to 0.71 ± 0.04) and arterial pO2 (from 92.3 ± 1.1 to 78.3 ± 1.7 mm Hg). The results indicate that acetate metabolism can lead to reduction in R and hypoxemia and suggest that the same mechanism is responsible for hypoxemia during hemodialysis using acetate dialysate.

Original languageEnglish
Pages (from-to)366-371
Number of pages6
JournalAmerican Journal of Nephrology
Volume5
Issue number5
DOIs
StatePublished - 1985
Externally publishedYes

Keywords

  • Acetate
  • Hemodialysis
  • Hypoxemia

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