The thiamin status of patients with chronic renal failure (CRF, n = 14), dialysis patients (DP, n = 24) and patients after renal transplantation (RT, n = 19) was assessed. Thiamin intake was calculated at mean levels of 1.26 mg/d (CRF), 0.83 mg/d (DP) and 1.42 mg/d (RT). Corresponding mean plasma concentrations were 64.2 nmol/l (CRF), 78.3 nmol/l (DP) and 55.1 nmol/l (RT). Thiamin supplements of 1.5 mg or 8.0 mg orally given to patients of the DP-group after each dialysis session showed slightly higher thiamin concentrations in plasma. Transketolase activity coefficients (ETK-AC) were in the same range (1.11...1.19) except for RT-patients who had a slightly but not significantly higher ETK-AC of 1.22. During dialysis treatment (DT), thiamin plasma concentrations dropped to 75 and/or 82% in patients supplemented with 1.5 and/or 8.0 mg. They both reached initial levels again 44 hours later. Despite large inter-individual differences, thiamin concentrations increased in the non-supplemented DP-group. ETK-AC did not change after a 14-day interruption of supplementation and did not deteriorate after a single dialysis session, both in supplemented and non-supplemented patients. A daily thiamin supplementation which complies with the RDA for healthy subjects is indicated in DP and is sufficient to keep thiamin status within the normal range.
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Frank et al. (2000) studied this question.