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Brain dysfunction in uremia: a question of cortical hyperexcitability?
Fortunato Battaglia1, Angelo Quartarone, Sergio Bagnato
1Department of Physiology and Pharmacology, City University of New York Medical School, New York, NY, USA. fb@med.cuny.edu
Summary
End-stage renal disease (ESRD) patients exhibit altered cortical excitability, particularly reduced short-interval intra-cortical inhibition. Replacement therapies like dialysis and transplantation reverse these changes, with plasma osmolarity shifts being key to post-dialysis effects.
Area of Science:
- Neuroscience
- Nephrology
- Clinical Neurophysiology
Background:
- End-stage renal disease (ESRD) is associated with neurological complications.
- Cortical excitability alterations may contribute to brain abnormalities in ESRD patients.
Purpose of the Study:
- To investigate cortical excitability in ESRD patients across different disease stages and treatments.
- To elucidate the role of plasma osmolarity in haemodialysis-induced cortical excitability changes.
Main Methods:
- Transcranial magnetic stimulation (TMS) was used to assess cortical excitability in 36 ESRD patients.
- A double-blind crossover study with mannitol versus placebo was conducted during haemodialysis.
Main Results:
- ESRD patients on conservative therapy showed reduced short-interval intra-cortical inhibition (SICI), which was reversible with renal replacement therapies.
- Haemodialysis increased intra-cortical facilitation (ICF), inversely correlated with plasma osmolarity drop.
- Mannitol administration prevented osmolarity changes and haemodialysis-related ICF alterations.
Conclusions:
- ESRD patients display altered cortical excitability, responsive to renal replacement therapies.
- A decrease in plasma osmolarity is implicated in the mechanism of post-haemodialysis cortical hyperexcitability.
- Findings offer insights into the pathophysiology of neurological dysfunction in chronic renal failure.