[Morpho-functional study of peritoneum in peritoneal dialysis]

Area of Science:

• Nephrology
• Histopathology
• Clinical Research

Background:

• Peritoneal dialysis (PD) can negatively affect the peritoneal membrane's (PM) structure and function.
• Understanding the interplay between dialysis parameters, histological changes, and functional outcomes in PD patients is crucial.

Purpose of the Study:

• To investigate the relationships among dialytic, histological, and functional parameters in patients undergoing peritoneal dialysis.
• To identify specific factors contributing to peritoneal membrane damage during PD therapy.

Main Methods:

• Peritoneal biopsy (PB) was performed on 31 PD patients during catheter removal.
• Peritoneal membrane (PM) transport was assessed using the peritoneal equilibration test (PET).
• Histological and immunohistochemical analyses were conducted on peritoneal tissue samples.

Main Results:

• Longer PD treatment duration correlated with mesothelial impairment.
• Higher daily glucose loads were associated with submesothelial sclerosis (SS) and subendothelial vascular membrane (SVM) impairment.
• High transporters showed increased SS thickness and higher glucose loads compared to medium-high transporters.
• Mesothelial loss was linked to SS and vascular alterations, which were interrelated and independent of inflammatory infiltrate.

Conclusions:

• PD duration appears to be a primary factor in mesothelial cell damage.
• Glucose load significantly impacts the submesothelial layer.
• Submesothelial sclerosis (SS) is not a universal finding in PD patients and may not be the sole reason for treatment cessation.