Hydration status does not influence peritoneal equilibration test ultrafiltration volumes

Area of Science:

• Nephrology
• Renal Medicine
• Peritoneal Dialysis

Background:

• The peritoneal equilibration test (PET) is a long-standing tool for guiding peritoneal dialysis prescriptions.
• Factors such as diabetes and inflammation are known to influence PET results.
• The study audited the clinical utility of PET, investigating the impact of extracellular fluid overload.

Purpose of the Study:

• To audit the usefulness of the peritoneal equilibration test (PET) in routine clinical practice.
• To determine factors affecting net PET ultrafiltration volumes.
• To investigate the influence of extracellular fluid volume and inflammation on PET outcomes.

Main Methods:

• Analysis of data from 211 patients undergoing a standard PET at a university teaching hospital.
• Utilized multifrequency bioimpedance to assess extracellular fluid volume.
• Employed multiple logistical regression analysis to identify factors influencing net PET ultrafiltration volumes.

Main Results:

• Net PET ultrafiltration volume was independent of gender, age, diabetes, residual renal function, dialysis prescriptions, extracellular fluid volume, and C-reactive protein (CRP).
• Inverse regression was observed with serum albumin and sodium levels.
• A positive regression was found with 24-h net peritoneal ultrafiltration volumes and strong correlation with net sodium losses.

Conclusions:

• PET ultrafiltration volume in clinical practice is not affected by CRP, hyperglycemia, or extracellular fluid overload.
• Reduced serum sodium and albumin levels were associated with increased ultrafiltration volumes.
• These findings suggest inflammation and protein malnutrition may influence PET results in patients with reduced serum sodium and albumin.