Cognitive performance in dialysis patients - "when is the right time to test?"

Area of Science:

• Nephrology
• Neuropsychology
• Public Health

Background:

• Cognitive impairment affects up to 87% of end-stage renal disease patients, posing a significant public health challenge.
• The underlying causes of cognitive impairment in chronic kidney disease remain unclear.
• Assessing cognitive function in dialysis patients is crucial due to its high prevalence.

Purpose of the Study:

• To investigate the effect of testing timing on cognitive performance in hemodialysis patients.
• To determine if cognitive testing during or between dialysis sessions influences results.
• To explore the impact of dialysis timing on cognitive function assessment.

Main Methods:

• Neuropsychological testing using the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS).
• Cognitive performance was assessed on two occasions during dialysis and on a dialysis-free day.
• Geriatric Depression Scale (GDS) and demographic/clinical variables were recorded.

Main Results:

• Patients performed best on the RBANS total scale score during the first 2 hours of dialysis.
• No significant difference in the total RBANS scale score was found across the three testing occasions (early dialysis, late dialysis, dialysis-free day).
• Significantly better language performance was observed during both early and late dialysis compared to the dialysis-free day.

Conclusions:

• The timing of cognitive testing (early dialysis, late dialysis, or dialysis-free day) did not influence overall cognitive function in hemodialysis patients.
• These findings suggest flexibility in scheduling cognitive assessments for hemodialysis patients.
• Further research may be needed to understand the nuances of cognitive performance across different dialysis phases.