Related Experiment Videos
Depressant action of acetate upon the human cardiovascular system
Insights
Acetate in hemodialysis (HD) significantly increases limb blood flow and depresses cardiac function. Bicarbonate-based HD showed fewer cardiovascular effects, suggesting acetate negatively impacts the cardio-vascular system.
Area of Science:
- Cardiovascular Physiology
- Nephrology
- Dialysis Therapy
Background:
- Hemodialysis (HD) is a critical treatment for kidney failure.
- The composition of dialysate, particularly buffer agents like acetate and bicarbonate, can influence patient outcomes.
- Understanding the cardiovascular effects of different dialysates is crucial for optimizing HD therapy.
Purpose of the Study:
- To evaluate the cardiovascular effects of hemodialysis using acetate-based dialysate.
- To compare these effects with those observed using bicarbonate-based dialysate.
- To determine if acetate exerts a direct depressant action on the cardiovascular system during HD.
Main Methods:
- Assessed cardiovascular parameters including limb blood flow, mean arterial blood pressure, and peripheral vascular resistance in 20 patients undergoing HD with acetate.
- Measured cardiac function using the pre-ejection period to left ventricular ejection time (PEP/ET) ratio.
- Repeated the study in 13 patients, substituting bicarbonate for acetate in the dialysate.
- Analyzed changes in serum electrolytes, pH, and body weight.
Main Results:
- Acetate-based HD led to increased limb blood flow and decreased peripheral vascular resistance, with unchanged mean arterial blood pressure.
- Cardiac function, indicated by a higher PEP/ET ratio, was significantly depressed after acetate-based HD.
- Bicarbonate-based HD resulted in no significant changes in limb blood flow or peripheral vascular resistance, although mean arterial blood pressure decreased.
- While cardiac function was still depressed with bicarbonate, the effect was significantly less pronounced than with acetate.
Conclusions:
- Acetate in hemodialysis dialysate appears to exert a direct depressant effect on the cardiovascular system.
- Bicarbonate-based dialysate demonstrates a more favorable cardiovascular profile compared to acetate during hemodialysis.
- These findings highlight the importance of dialysate composition in managing cardiovascular stability in HD patients.
Abstract:
The effect of regular hemodialysis (HD) with dialyzate containing acetate was evaluated in 20 patients. After dialysis, a significant increase in limb blood flow was found (P less than 0.01) while the mean arterial blood pressure remained unchanged indicating a significant decrease in peripheral vascular resistance after HD (P less than 0.01). Cardiac function was evaluated using the ratio of the preejection period to left ventricular ejection time (PEP/ET); this value showed a significant increase after HD suggesting depression of cardiac function (P less than 0.001). The study was repeated substituting bicarbonate for acetate in 13 of the 20 patients. Under these conditions, limb blood flow and peripheral vascular resistance showed no significant change though mean arterial blood pressure decreased significantly (P less than 0.01). The ratio, PEP/ET, showed a significant increase after HD (P less than 0.01), but the value was significantly lower than that found after HD with dialyzate containing acetate (P less than 0.05). Changes in the serum levels of calcium, potassium, pH and body weight could not explain the differences found after HD with the two kinds of dialyzate. The results of the present study suggest strongly that acetate exerts a depressant action on the cardio-vascular system.