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Plasma and dialysate immunoglobulin G in continuous ambulatory peritoneal dialysis patients: a multicenter study
A F De Vecchi1, J D Kopple, G A Young
1Divisione di Nefrologia e Dialisi, Ospedale Maggiore, Milano, Italy.
Insights
Immunoglobulin (Ig)G levels in peritoneal dialysis fluid and plasma do not appear to prevent peritonitis in continuous ambulatory peritoneal dialysis (CAPD) patients. Further research is needed to understand peritonitis prevention strategies.
Area of Science:
- Nephrology
- Immunology
Background:
- Peritonitis is a common complication in continuous ambulatory peritoneal dialysis (CAPD).
- Immunoglobulin (Ig)G is a key component of the immune system, and its role in preventing peritonitis in CAPD patients is not fully understood.
Purpose of the Study:
- To determine the normal range of dialysate Immunoglobulin (Ig)G concentrations in CAPD patients.
- To investigate the relationship between dialysate and plasma IgG levels and the incidence of peritonitis.
Main Methods:
- Measurement of dialysate IgG concentrations in 120 CAPD patients across four international dialysis centers.
- Determination of plasma IgG levels and calculation of IgG clearances in 65 patients.
- Statistical analysis to correlate IgG levels with various clinical parameters and peritonitis incidence.
Main Results:
- The mean dialysate IgG concentration was 6.9 +/- 4.2 mg/dl, with no significant differences based on sex or prior hemodialysis.
- Dialysate IgG levels correlated with residual renal creatinine clearance and were inversely related to dialysate volume, plasma albumin, and total protein.
- Neither dialysate nor plasma IgG levels showed a significant correlation with peritonitis incidence.
Conclusions:
- IgG levels in dialysate or plasma are not a primary factor in preventing peritonitis in CAPD patients.
- The findings suggest that other immune mechanisms or factors are more critical in peritonitis prevention during CAPD.
Abstract:
Peritoneal dialysate immunoglobulin (Ig)G concentrations were measured in 120 continuous ambulatory peritoneal dialysis (CAPD) patients evaluated at four dialysis centers in different countries to assess the normal range for dialysate IgG and to investigate the relationships of this protein levels with peritoneal episodes, For 65 of these patients, plasma IgG levels were determined, and IgG clearances were calculated. The mean dialysate concentration of IgG was 6.9 +/- 4.2 mg/dl, and there was no difference between men and women or between patients who had or had not previously undergone hemodialysis. Dialysate IgG concentrations were significantly related to residual renal creatinine clearance and negatively correlated with dialysate volume, plasma albumin and total protein. There were no significant correlations between IgG levels in the dialysate and age, protein losses in the dialysate, time on CAPD or time from the last peritonitis episode. Plasma and dialysate IgG were unrelated to the incidence of peritonitis, statistical analysis being performed with different methods. These results suggest that IgG levels in the dialysate or plasma are not a major factor in the prevention of CAPD peritonitis.