Oxalate nephropathy following vitamin C intake within intensive care unit

Clin Nephrol. 2017 Dec;88(12):354-358. doi: 10.5414/CN109118.

Abstract

Objective: To report a case of acute oxalate nephropathy related to vitamin C intake within the intensive care unit (ICU).

Design: Case report.

Setting: ICU and nephrology department of a French university hospital.

Patient: A 57-year-old woman with septic shock related to <italic>Legionella pneumophila</italic> pneumonia complicated by acute respiratory distress syndrome and acute kidney injury who required renal replacement therapy for 75 days.

Measurements and main results: A renal biopsy was performed on day 72 because of persistent anuria and because the patient showed characteristic features of severe acute oxalate nephropathy. The only cause identified was vitamin C intake received during hospitalization within the ICU (~ 30 g over 2.5 months). At month 6 after ICU admission, estimated glomerular filtration rate was 24 mL/min/1.73m<sup>2</sup>.

Conclusion: Compelling evidence obtained from in-vitro and animal studies suggest that vitamin C, a circulating antioxidant, may be a valuable adjunctive therapy in critically-ill patients. Data from humans are more conflicting. Oxalate, a well-known metabolite of vitamin C, is excreted by the kidneys and can exert a toxic effect on epithelial cells and causes direct tubular damage, and/or it can crystallize within the tubular lumen. This case highlights an under-recognized secondary adverse event from vitamin C given to critically-ill patients. The use of high-dose vitamin C should be prescribed with caution in this population. .

Publication types

  • Case Reports

MeSH terms

  • Acute Kidney Injury / therapy
  • Ascorbic Acid / adverse effects*
  • Ascorbic Acid / metabolism
  • Critical Illness*
  • Female
  • Humans
  • Intensive Care Units
  • Kidney Diseases / chemically induced*
  • Middle Aged
  • Oxalates / toxicity*
  • Renal Replacement Therapy

Substances

  • Oxalates
  • Ascorbic Acid