Removal of endogenous middle molecules by hemoperfusion

Area of Science:

• Nephrology
• Biomedical Engineering

Background:

• Uremic middle molecules accumulate in patients with kidney failure.
• Efficient removal of these toxins is crucial for patient outcomes.

Purpose of the Study:

• To evaluate the efficacy of activated carbon hemoperfusion for removing uremic middle molecules.
• To determine the optimal duration for hemoperfusion treatment.

Main Methods:

• Hemoperfusion using a cellulose-encapsulated activated carbon column (300 gm).
• Analysis of plasma middle molecules via high-speed gel filtration and gradient elution chromatography.
• Measurement of solute clearances over a three-hour period in four dialysis patients.

Main Results:

• Initial clearances for middle molecule fractions averaged 120 ml/min.
• Clearances decreased significantly to 20-50 ml/min after two hours and <25 ml/min after three hours.
• Some middle molecule fractions were released from the column after three hours, indicating saturation.

Conclusions:

• Activated carbon hemoperfusion shows effectiveness in reducing plasma middle molecules.
• Column saturation occurs between two and three hours, limiting benefits of extended perfusion.
• A three-hour hemoperfusion achieves middle molecule reduction comparable to high-flux hemodialysis.