Depression at Baseline Is an Independent Risk Factor for Cognitive Decline in Patients on Peritoneal Dialysis: A...

Area of Science:

• Nephrology
• Neuroscience
• Psychiatry

Background:

• Depression is a known risk factor for cognitive impairment (CI).
• Previous studies linking depression and CI primarily used cross-sectional data.
• The impact of depression on cognitive decline in peritoneal dialysis (PD) patients requires further prospective investigation.

Purpose of the Study:

• To prospectively investigate the association between depression and cognitive decline in PD patients.
• To assess the impact of baseline depression severity on cognitive function over a 2-year period.
• To identify depression as a predictor of cognitive decline in this population.

Main Methods:

• A multicenter prospective cohort study involving 458 PD patients over 2 years.
• Cognitive function assessed using the Modified Mini-Mental State Examination (3MS) for global cognition, Trail-Making Tests for executive function, and the Battery for the Assessment of Neuropsychological Status for memory, visuospatial skills, and language.
• Depression assessed using Zung's Self-Rating Depression Scale.

Main Results:

• Patients with moderate/severe depression showed a significant decline in global cognitive function over 2 years (p=0.008).
• Patients without depression maintained stable global cognitive function and showed improvements in memory, visuospatial skills, and language.
• Baseline depression was a significant predictor of worsening global cognitive function (OR=-0.14, p=0.031) and decline in memory and language skills.

Conclusions:

• Depression is a significant risk factor for cognitive decline in PD patients.
• Severity of depression correlates with the degree of cognitive impairment.
• Early detection and management of depression may be crucial for preserving cognitive function in PD patients.