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Related Experiment Videos

Urea kinetics and when to commence dialysis

J Tattersall1, R Greenwood, K Farrington

  • 1Renal Unit, Lister Hospital, Stevenage, UK.

American Journal of Nephrology
|January 1, 1995
PubMed
Summary

Urea kinetic modelling (UKM) shows chronic renal failure patients start dialysis significantly underdialysed. Six months of treatment, either CAPD or haemodialysis, significantly improves dialysis adequacy (KT/V).

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Area of Science:

  • Nephrology
  • Renal Medicine
  • Dialysis Adequacy

Background:

  • Traditional markers like blood urea and serum creatinine guide dialysis initiation.
  • Emphasis is shifting towards kinetic methods for assessing dialysis adequacy.
  • Urea kinetic modelling (UKM) offers a more precise evaluation of dialysis effectiveness.

Purpose of the Study:

  • To apply urea kinetic modelling (UKM) in chronic renal failure (CRF) patients at dialysis initiation.
  • To compare UKM results at dialysis commencement with those after six months of treatment.
  • To evaluate the relationship between UKM, patient demographics, and clinical outcomes.

Main Methods:

  • Urea kinetic modelling (UKM) applied to 63 consecutive CRF patients.
  • Measurements taken at dialysis initiation (KTi/V) and after six months of treatment.
  • Comparison of normalized urea clearance (daily KT/V) between time points and dialysis modalities.

Main Results:

  • Mean normalized urea clearance (daily KT/V) at commencement was 0.15 ± 0.05, indicating underdialysis.
  • After six months, mean daily KT/V significantly increased to 0.35 ± 0.12 (CAPD) and 0.49 ± 0.08 (haemodialysis).
  • Serum creatinine levels remained similar post-treatment, unlike KT/V; higher age and comorbidity correlated with mortality and hospitalization.

Conclusions:

  • Patients with chronic renal failure often start dialysis with inadequate clearance.
  • Six months of either CAPD or haemodialysis significantly improves dialysis adequacy (KT/V).
  • UKM is a valuable tool for assessing dialysis adequacy, surpassing traditional markers like serum creatinine.

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