Is oxidative stress an issue in peritoneal dialysis?

Area of Science:

• Nephrology
• Biochemistry
• Pathophysiology

Background:

• Oxidative stress (OS) is increasingly recognized as a significant risk factor in chronic kidney disease (CKD), contributing to atherosclerosis and mortality.
• OS exacerbates with declining renal function and is further aggravated by hemodialysis (HD) due to its bioincompatibility.
• Peritoneal dialysis (PD), while more biocompatible than HD, still presents a high OS burden primarily due to the composition of PD solutions.

Purpose of the Study:

• To investigate the role of oxidative stress in chronic kidney disease patients undergoing peritoneal dialysis.
• To identify the specific components of peritoneal dialysis solutions that contribute to oxidative stress.
• To explore strategies for ameliorating oxidative stress in patients on PD.

Main Methods:

• Analysis of oxidative stress markers in CKD patients undergoing PD.
• Evaluation of the impact of PD solution composition (pH, lactate, osmolarity, glucose) on oxidative stress.
• Review of the literature on glucose degradation products (GDPs) and advanced glycation end-products (AGEs) in PD solutions.
• Assessment of the link between OS and PD-related complications such as peritonitis and technique survival.

Main Results:

• PD solutions, particularly after heat sterilization, generate GDPs and AGEs, triggering inflammation and enhancing OS.
• Chronic exposure to the PD environment causes morphologic damage to peritoneal cells, reduces ultrafiltration capacity, and decreases technique survival.
• OS in PD is associated with peritonitis, loss of residual renal function, inflammation, cardiovascular disease, and increased mortality.

Conclusions:

• A multi-targeted approach is essential to mitigate OS in PD patients.
• Strategies include using improved PD solutions (neutral pH, low GDP, low lactate, iso-osmolar), strict glycemic control, and optimal volume management.
• Antioxidant supplementation, with N-acetylcysteine showing promise, may further help ameliorate OS status.