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Ventilatory and metabolic changes during high efficiency hemodialysis.
T Symreng1, M J Flanigan, V S Lim
1Department of Internal Medicine, University of Iowa College of Medicine, Iowa City.
Kidney International
|April 1, 1992
Summary
High efficiency bicarbonate hemodialysis increases ventilation and CO2 excretion. A healthy respiratory system is crucial for managing CO2 during this dialysis method.
Area of Science:
- Nephrology
- Physiology
Background:
- Hemodialysis is a critical treatment for kidney failure.
- Bicarbonate dialysate is commonly used to correct metabolic acidosis.
- High-efficiency dialysis aims to improve solute removal.
Purpose of the Study:
- To investigate ventilatory and metabolic changes during high-efficiency hemodialysis with bicarbonate dialysate.
- To assess the impact of bicarbonate dialysis on gas exchange and acid-base balance.
Main Methods:
- Seven patients undergoing high-efficiency hemodialysis with a cuprophane dialyzer and bicarbonate dialysate were studied.
- Ventilatory parameters (minute ventilation, CO2 excretion, O2 consumption) and blood gas analysis were performed.
- Measurements were taken before and during dialysis with a bicarbonate concentration of 35 mEq/liter.
Main Results:
- No hypoxemia was detected during dialysis (PaO2 remained stable).
- Significant increases were observed in minute ventilation (VE), CO2 excretion (VCO2), and O2 consumption (VO2).
- Arterial pH increased, indicating correction of metabolic acidosis, while CO2 partial pressure (pCO2) remained normal systemically but shifted across the dialyzer.
Conclusions:
- High-efficiency bicarbonate hemodialysis necessitates a robust ventilatory response to manage increased CO2 production.
- The observed rise in O2 consumption warrants further investigation into its cause and clinical significance.
- Maintaining adequate ventilation is essential for patients undergoing this dialysis modality.