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Relationship between acute hypercarbia and hyperkalaemia during surgery
Laurence Weinberg1, Amelia Russell2, Lois Mackley2
1Department of Anaesthesia, Austin Health, Melbourne, Victoria 3084, Australia. laurence.weinberg@austin.org.au.
World Journal of Clinical Cases
|December 5, 2019
Summary
This study found that acute hypercarbia, or elevated carbon dioxide levels, did not significantly increase plasma potassium concentrations in patients undergoing major surgery. Therefore, acute respiratory acidosis is not associated with hyperkalemia in this clinical setting.
Area of Science:
- Critical care medicine
- Cardiovascular surgery
- Respiratory physiology
Background:
- The link between hyperkalemia and metabolic acidosis is established in critical care.
- The relationship between acute respiratory acidosis and plasma potassium is less understood.
- This study investigated hypercarbia's effect on plasma potassium.
Purpose of the Study:
- To determine if increasing levels of hypercarbia are associated with changes in plasma potassium concentrations.
- To investigate the association between carbon dioxide and serum potassium.
- To examine the correlation between plasma pH and serum potassium.
Main Methods:
- Post-hoc analysis of 24 patients undergoing cardiac surgery with induced hypercarbia.
- Measurement of arterial blood gases and plasma potassium at baseline and during hypercarbia.
- Primary endpoint: absolute change in serum potassium at 15 minutes.
Main Results:
- PaCO2 significantly increased from 43.6 mmHg to 83.9 mmHg (P < 0.0001).
- Mean serum potassium showed a non-significant increase from 4.16 to 4.28 mmol/L (P = 0.22).
- No significant correlation was found between PaCO2 and potassium (r=0.06) or pH and potassium (r=-0.07).
Conclusions:
- Acute hypercarbia and respiratory acidaemia were not associated with hyperkalemia.
- Findings suggest no significant impact of acute respiratory acidosis on plasma potassium levels in this surgical context.