Acid-base balance during continuous veno-venous hemofiltration: The impact of severe hepatic failure

T. Naka, Rinaldo Bellomo, H. Morimatsu, J. Rocktaschel, L. Wan, P. Gow, P. Angus

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10 Citations (Scopus)

Abstract

Background: Continuous renal replacement therapy (CRRT) affects acid-base balance but the influence of severe hepatic failure (SHF) on this effect is unknown. Aim: To assess the effect of SHF on acid-base balance in patients receiving CVVH. Design: Retrospective laboratory investigation. Subjects: Forty patients with SHF and acute renal failure (ARF) treated with CVVH and 42 critically ill patients with severe ARF but no liver disease also treated with CVVH (controls). Intervention: Retrieval of clinical and laboratory data from prospective unit and laboratory databases. Methods: Quantitative acid-base status assessment using the Stewart-Figge methodology. Comparison of findings between the two groups. Results: Although CVVH had a major effect on acid base balance in both groups, patients with SHF had a higher mean lactate concentrations (4.8 vs. 3.1 mmol/L; p<0.0005), a greater base deficit compared to controls (-1 vs. 4.1 mEq/L; p<O.0001) and a lower PaCO2 tension (36.8 vs. 42.5 mmHg; p<0.0001), despite the use of bicarbonate replacement fluid. The acidifying effect of hyperlactatemia was slightly worsened by an increased strong ion gap (9.3 vs. 4.9 mEq/L; p<0.0001). It was, however, attenuated by an increased strong ion difference apparent (SIDa) (43.6 vs. 41.9 mEq/L; p<0.05) secondary to hypochloremia (96 vs. 100 mmol/L; p<0.0001) and by hypoalbuminemia, although hypoalbuminemia in SHF patients (26 vs. 23; p<0.005) was less pronounced than in controls. Conclusion: The use of CVVH does not fully correct the independent acidifying effect of liver failure on acid-base status. Increased lactate and strong ion gap values maintain a persistent base deficit despite the alkalinizing effects of hypoalbumnemia and hypochloremia. The correction of acidosis in SHF patients may require more intensive CVVH.

Original languageEnglish
Pages (from-to)668-674
Number of pages7
JournalInternational Journal of Artificial Organs
Volume29
Issue number7
Publication statusPublished - 1 Jul 2006
Externally publishedYes

Keywords

  • Acidemia
  • Acidosis
  • Acute liver failure
  • Acute renal failure
  • Base deficit
  • Hemofiltration
  • Hypoalbumemia
  • Lactate
  • Strong ion gap

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