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Respiratory gas exchange by high-efficiency hemodialyzers
Nephron
|January 1, 1978
Summary
High-efficiency hemodialyzers can remove carbon dioxide from the blood, leading to hypocapnia (low carbon dioxide levels) and altered respiratory status. This gas transfer impacts acid-base balance during dialysis.
Area of Science:
- Nephrology
- Pulmonary Physiology
- Biomedical Engineering
Background:
- Hemodialysis involves extracorporeal blood circulation, potentially affecting respiratory gas exchange.
- High-efficiency dialyzers may enhance mass transfer of respiratory gases.
Purpose of the Study:
- To investigate the impact of respiratory gas mass-transfer by hemodialyzers on respiratory status and acid-base balance.
- To compare the effects of different dialysate systems on carbon dioxide and oxygen levels during hemodialysis.
Main Methods:
- Three groups of patients undergoing hemodialysis were studied.
- Group I: Acetate dialysate, single-pass system.
- Group II: Acetate dialysate, recirculating single-pass system.
- Group III: Carbon dioxide/bicarbonate dialysate.
Main Results:
- Groups I and II showed significant intradialytic decreases in partial pressure of carbon dioxide (PCO2).
- Group III had no significant alteration in arterial PCO2.
- Hypocapnia in Groups I and II led to decreased minute ventilation and PO2, particularly in Group I.
- Dialysis against CO2/bicarbonate dialysate did not alter PCO2 but reduced serum bicarbonate.
Conclusions:
- High-efficiency hemodialyzers can induce significant carbon dioxide removal, causing hypocapnia and respiratory changes.
- The choice of dialysate and delivery system influences intradialytic gas exchange and acid-base balance.
- Understanding these effects is crucial for managing patients during hemodialysis.