Discrepancy between weekly KT/V and weekly creatinine clearance in patients on CAPD

Area of Science:

• Nephrology
• Dialysis Therapy
• Clinical Chemistry

Background:

• Continuous ambulatory peritoneal dialysis (CAPD) relies on weekly KT/V and weekly creatinine clearance (WCC) to assess adequacy.
• Minimum recommended CAPD targets are 1.7/week for KT/V and 50 L/week for WCC.
• Current guidelines lack clarity on managing discrepancies between these two key performance indicators.

Purpose of the Study:

• To analyze the correlation between weekly KT/V and WCC in CAPD patients.
• To investigate the impact of peritoneal equilibration test (PET) groups on this correlation.
• To examine factors contributing to discrepancies between KT/V and WCC.

Main Methods:

• Cross-sectional analysis of 68 CAPD patients.
• Measurement of weekly KT/V, WCC, residual clearances, and 4-hour peritoneal equilibration test (PET).
• Statistical analysis to determine correlations and compare patient groups with discrepant values.

Main Results:

• A highly significant correlation was found between KT/V and WCC in the overall patient group (p < 0.0001).
• Significant correlation was observed in low-average and high-average PET groups, but not in high or low PET groups.
• Twenty percent of patients (14/68) exhibited discrepancies, with 7 having low KT/V and high WCC, and 7 having high KT/V and low WCC.

Conclusions:

• Discrepancies between KT/V and WCC in CAPD patients can occur, influenced by residual renal function.
• Patients with low KT/V and high WCC showed higher residual renal function, suggesting greater creatinine secretion and urea reabsorption.
• Patients with high KT/V and low WCC demonstrated better urea removal than creatinine removal, indicating altered solute transport dynamics.