The morphology of parietal peritoneum: a scanning electron micrograph study

Area of Science:

• Nephrology
• Histology
• Biomedical Engineering

Background:

• Continuous ambulatory peritoneal dialysis (CAPD) is a treatment for end-stage renal failure.
• The effects of CAPD and peritonitis on the parietal peritoneum are not fully understood.
• Scanning electron microscopy (SEM) offers a detailed view of peritoneal tissue changes.

Purpose of the Study:

• To investigate the morphological changes in the parietal peritoneum of patients undergoing CAPD using SEM.
• To assess the impact of peritonitis on peritoneal tissue structure.
• To evaluate the potential for peritoneal regeneration after CAPD and peritonitis.

Main Methods:

• Parietal peritoneal biopsies were obtained from 30 patients undergoing CAPD.
• SEM was used to examine 40 tissue samples at different stages: catheter implantation, removal, and reinsertion.
• Patients included those with and without peritonitis.

Main Results:

• Two types of mesothelial cells (hexagonal and elongated) were observed in uremic patients.
• Microvilli presence varied; wide stomata were noted, especially in patients with peritonitis.
• Peritonitis led to microvilli loss, fibrin/leukocyte/erythrocyte coverage, and mesothelial cell detachment.
• One case showed complete mesothelial regeneration with microvilli after catheter reinsertion.

Conclusions:

• CAPD and peritonitis induce significant, potentially reversible, changes in the parietal peritoneum.
• Mesothelial cell regeneration is possible, suggesting a capacity for healing.
• Persistent peritoneal damage may occur in patients with impaired fibrinolysis or failed regeneration.