Zinc transport during hemodialysis

Area of Science:

• Nephrology
• Clinical Chemistry
• Trace Element Metabolism

Background:

• Zinc is an essential trace element crucial for numerous physiological functions.
• Maintaining adequate zinc levels is important for patients with chronic kidney disease undergoing hemodialysis.
• Previous studies have suggested potential zinc loss or changes during hemodialysis.

Purpose of the Study:

• To investigate zinc transfer dynamics during hemodialysis.
• To determine the impact of hemodialysis on plasma zinc concentrations in patients.
• To differentiate between hemoconcentration and diffusion as causes for observed zinc level changes.

Main Methods:

• Plasma zinc concentrations and hematocrit were measured in 15 hemodialysis patients before and after a 5-hour dialysis session.
• Arterial blood and dialysate zinc levels were analyzed to assess diffusion across the dialyzer.
• Total serum protein was also monitored to evaluate hemoconcentration effects.

Main Results:

• Plasma zinc concentrations significantly increased from 74.0 ± 7.8 to 88.1 ± 9.7 µg/dL post-hemodialysis.
• This increase was largely attributed to hemoconcentration, evidenced by rising hematocrit and total serum protein.
• A significant increase in arterial plasma zinc (74.7 ± 8.1 to 80.2 ± 6.5 µg/dL) indicated diffusion into the blood, despite a non-significant decrease in dialysate zinc.

Conclusions:

• Hemodialysis can lead to an increase in plasma zinc concentrations in patients.
• Both hemoconcentration and diffusion across the dialyzer contribute to zinc level changes during dialysis.
• Further research may be needed to optimize zinc balance in hemodialysis patients.