Hemodynamic changes during acetate dialysis, bicarbonate dialysis and hemofiltration

Area of Science:

• Nephrology
• Cardiovascular Physiology
• Renal Replacement Therapy

Background:

• Uremic patients undergoing dialysis experience significant hemodynamic changes.
• Different dialysis modalities may elicit distinct cardiovascular responses.
• Understanding these responses is crucial for patient management.

Purpose of the Study:

• To compare the hemodynamic effects of acetate dialysis, bicarbonate dialysis, and hemofiltration in uremic patients.
• To investigate the role of buffer composition and transport mechanism on cardiovascular parameters.

Main Methods:

• Hemodynamic parameters including cardiac index (CI) and resistance index (RI) were monitored using a thermistor Swan-Ganz catheter.
• Twenty uremic patients were divided into three groups: acetate dialysis (n=6), bicarbonate dialysis (n=8), and hemofiltration (n=6).
• Data were collected during each dialytic procedure.

Main Results:

• Acetate dialysis showed a +4.8% increase in CI and a -16.5% decrease in RI.
• Bicarbonate dialysis resulted in an initial CI fall, followed by stabilization, and an +8.6% increase in RI.
• Hemofiltration led to a continuous decrease in CI and an +12.9% increase in RI.

Conclusions:

• The buffer used significantly influences hemodynamic responses during diffusive transport (dialysis) for fluid removal.
• Convective transport (hemofiltration) leads to increased vascular resistance, irrespective of acetate presence.
• Careful consideration of dialysis buffer and modality is essential for optimizing hemodynamic stability in uremic patients.