Short peritoneal equilibration test: impact of preceding dwell time

Area of Science:

• Nephrology
• Renal Replacement Therapy
• Peritoneal Dialysis

Background:

• The original peritoneal equilibration test (PET) used an 8-hour preceding exchange, which is inconvenient for patients on automated peritoneal dialysis (PD).
• Modern PD practices necessitate evaluating shorter dwell times for the PET to align with patient schedules.

Purpose of the Study:

• To determine if a 2-hour PET yields similar solute and glucose transport values compared to a PET preceded by a 3-hour or 8-hour exchange.
• To assess the suitability of a shortened PET protocol for clinical use and membrane categorization.

Main Methods:

• Nine stable PD patients underwent two 2-hour PETs using 2 L of 2.5% dextrose dialysis solution.
• One PET followed a 3-hour preceding exchange, and the other followed an 8-hour preceding exchange, performed within a week of each other.
• Dialysate samples were collected at 0, 30, 60 minutes, and from the drain bag (120 minutes) during the PET.

Main Results:

• Dialysate-to-plasma (D/P) ratios for creatinine and urea, and D/D0 glucose ratios were nearly identical after both 3-hour and 8-hour preceding exchanges.
• D/P protein values were higher following the 8-hour preceding exchange compared to the 3-hour exchange.
• A 2-hour PET equilibration time is clinically viable for assessing creatinine and glucose transport.

Conclusions:

• A short PET (2-hour equilibration) is suitable for clinical use and effective for peritoneal membrane categorization based on creatinine and glucose levels.
• Preceding exchange dwell times between 3 and 12 hours are acceptable, and the PET can use either 2-hour or 4-hour dwell times.
• Protein values from PETs are influenced by preceding dwell time, necessitating standardization for accurate interpretation.