Effect of renal transplantation on cognitive function in hemodialysis patients: a longitudinal study

  • Yogesh K. Chhabra
  • Sanjay Sood
  • Omprakash Rathi
  • Sandeep Mahajan
Nephrology – Original Paper

Abstract

Background

The literature notes high prevalence of cognitive function (CF) impairment among hemodialysis patients. Renal transplantation by reversing metabolic factors should improve cognitive function; however, results in post-transplant patients are inconsistent. Lack of longitudinal studies, variable and small patient population, variable renal function and post-transplantation period and use of non-specific tests make results difficult to interpret. We looked at CF in stable hemodialysis patients just prior to live renal transplantation and approximately 3 months subsequently using well-validated electrophysiological study of P300 cognitive potential obtained by auditory oddball paradigm using multiple scalp electrodes.

Methods

Ten healthy age- and gender-matched controls (group 1) and 20 end-stage kidney disease (ESKD) male patients on maintenance hemodialysis with no other comorbidities that affect CF were studied before (group 2) and 3 months after successful transplantation (group 3).

Results

ESKD population had mean age of 29.7 ± 7.5 years, with mean dialysis vintage and post-transplant period being 10.3 ± 6.9 and 3.2 ± 0.4 months, respectively. Mean P300 latencies in groups 1, 2 and 3 were 319 ± 33.6, 348.6 ± 27.8 and 316.4 ± 33.4 ms, respectively (P < 0.001 group 1 vs 2 and group 2 vs 3; group 1 vs 3 NS). Mean P300 amplitude in groups 1, 2 and 3 was 27.9 ± 12.8, 13.4 ± 8.6 and 14.6 ± 9.4 µV, respectively (P < 0.001 group 1 vs 2 and group 1 vs 3; group 2 vs 3 NS). P300 latencies correlated negatively with hemoglobin and serum albumin.

Conclusions

ESKD patients have impaired CF as documented by prolonged P300 latencies. There was normalization of P300 latencies post-transplantation indicating role of uremic toxins in CF impairment.

Keywords

Albumin Chronic kidney disease Evoked-related potential P300 Cognitive function 

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Yogesh K. Chhabra
    • 1
  • Sanjay Sood
    • 2
  • Omprakash Rathi
    • 3
  • Sandeep Mahajan
    • 1
  1. 1.Department of NephrologyAll India Institute of Medical SciencesNew DelhiIndia
  2. 2.Department of PhysiologyRAK College of Medical SciencesRas Al KhaimahUAE
  3. 3.Department of NephrologyBombay HospitalIndoreIndia

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