Hemodialysis. Basic principles and practice

Area of Science:

• Nephrology
• Biomedical Engineering

Background:

• Hemodialysis is a crucial treatment for end-stage renal disease, removing uremic toxins and excess fluid.
• The efficiency of hemodialysis is determined by the semipermeable membrane within the hemodialyzer.
• Both hollow-fiber and parallel-plate hemodialyzers are utilized, with parallel-plate designs gaining traction due to compatibility with advanced membranes.

Purpose of the Study:

• To explore the advancements in hemodialysis technology, particularly focusing on semipermeable membranes.
• To highlight the clinical advantages of newer membranes enabling ultrafiltration independent of diffusion dialysis.
• To identify the ongoing challenges in assessing hemodialysis prescription adequacy.

Main Methods:

• Review of hemodialysis technology, focusing on semipermeable membrane characteristics (size, shape, type).
• Comparison of hollow-fiber and parallel-plate hemodialyzer designs.
• Analysis of the composition of dialysate baths in relation to plasma water and end-stage renal disease abnormalities.

Main Results:

• Newer semipermeable membranes allow for ultrafiltration without concurrent diffusion dialysis, presenting potential clinical advantages.
• Parallel-plate hemodialyzers are becoming more prevalent due to their ability to incorporate these advanced membranes.
• Despite technical improvements, a standardized, user-friendly method for evaluating hemodialysis prescription adequacy is still lacking.

Conclusions:

• Advancements in semipermeable membranes are enhancing hemodialysis capabilities, particularly in fluid removal.
• The development of parallel-plate hemodialyzers facilitates the use of these innovative membranes.
• Further research is needed to establish reliable methods for assessing the adequacy of hemodialysis treatments.