Overhydration prevalence in peritoneal dialysis - A 2 year longitudinal analysis

Area of Science:

• Nephrology
• Cardiovascular Health
• Body Composition Analysis

Background:

• Hypervolemia poses significant cardiovascular risks and mortality in dialysis patients.
• Previous cross-sectional studies suggest peritoneal dialysis (PD) patients are not more overhydrated than hemodialysis patients.
• Longitudinal data on hydration and body composition in PD patients are limited.

Purpose of the Study:

• To evaluate longitudinal trends in hydration status and body composition in a peritoneal dialysis population.
• To assess the feasibility of maintaining PD without increasing volume status or causing deleterious body composition changes.

Main Methods:

• A 2-year prospective observational study included 58 incident and prevalent PD patients.
• Multifrequency electric bioimpedance (BIA) was used for yearly measurements of hydration status and body composition.
• Overhydration (OH) was defined as extracellular water (ECW)/total body water (TBW) > 15%; clinical and biochemical variables were also monitored.

Main Results:

• No significant longitudinal changes were observed in hydration status, blood pressure, pro-BNP, or albumin levels in the overall cohort (n=30).
• Prevalent PD patients showed moderate overhydration compared to incident patients at the second year (10.2% vs 3.5%; p=.009).
• Nutritional parameters, total body water (TBW), and extracellular water (ECW) remained stable throughout the study.

Conclusions:

• Peritoneal dialysis can be maintained without significant increases in volume status or negative body composition trends with careful management.
• Longitudinal bioimpedance analysis (BIA) is a valuable clinical tool for assessing PD adequacy beyond traditional metrics like Kt/V.
• Monitoring hydration status and body composition longitudinally is crucial for optimizing PD patient care.