Convection versus diffusion in dialysis: an Italian prospective multicentre study

Area of Science:

• Nephrology
• Cardiovascular Medicine
• Renal Replacement Therapy

Background:

• Dialysis adequacy traditionally focuses on urea removal, but medium and large molecule clearance is also crucial.
• Previous studies suggest high-flux dialysis may offer benefits, but convection's full potential remains underexplored.
• Internal filtration in high-flux hemodialysis (HD) might be less than expected compared to hemofiltration (HF) or hemodiafiltration (HDF).

Purpose of the Study:

• To investigate the benefits of on-line convective treatments (HF and HDF) compared to standard low-flux HD.
• To assess the impact of convective treatments on cardiovascular stability and blood pressure control.
• To evaluate secondary outcomes including symptoms, morbidity, mortality, feasibility, and patient compliance.

Main Methods:

• Prospective, multicenter Italian study comparing on-line HF/HDF with low-flux HD.
• Patients undergo a 2-month baseline period on their usual treatment.
• Randomization to either continue low-flux HD (50%) or switch to HF/HDF (50%) for at least 2 years (3-month adaptation, then evaluation).

Main Results:

• The study is designed with adequate power to detect a 3% absolute reduction in hypotensive episodes with convective treatments.
• Primary endpoint: cardiovascular stability and blood pressure control.
• Secondary endpoints: symptoms, morbidity, mortality, feasibility, and patient compliance.

Conclusions:

• On-line convective treatments like HF and HDF may offer advantages over standard low-flux HD.
• Further research is needed to confirm the benefits of enhanced convection in dialysis adequacy.
• This study aims to provide crucial data on improving patient outcomes in renal replacement therapy.