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Preoperative hyponatremia and cardiopulmonary bypass: yet another factor for cerebral dysfunction?
Richard Warwick1, Kenneth Palmer, Ian Johnson
1Cardiothoracic Surgery, The Cardiothoracic Centre Liverpool, Liverpool Heart and Chest Hospital, Liverpool.
The Journal of Extra-Corporeal Technology
|May 5, 2010
Summary
Patients with hyponatremia before cardiopulmonary bypass (CPB) experience longer hospital stays. CPB prime constituents and patient factors significantly impact serum sodium levels during the procedure.
Area of Science:
- Cardiovascular Surgery
- Nephrology
- Neurology
Background:
- Hyponatremia is prevalent in patients undergoing cardiopulmonary bypass (CPB), often linked to diuretic use.
- Rapid correction of hyponatremia during CPB poses a risk for central pontine myelomatosis in susceptible individuals.
Purpose of the Study:
- To analyze the impact of preoperative hyponatremia on outcomes in patients undergoing CPB.
- To review sodium concentrations in CPB prime solutions.
- To model the effects of patient and prime characteristics on serum sodium during CPB.
Main Methods:
- Analysis of 170 patients with preoperative hyponatremia undergoing CPB, examining degree of hyponatremia, EuroSCORE, length of stay, and mortality.
- Literature collation of sodium concentrations in various CPB prime constituents.
- Mathematical modeling to assess the influence of patient size, sex, hemoglobin, prime solution, and volume on serum sodium during CPB.
Main Results:
- Patients with preoperative hyponatremia had significantly longer intensive care and total hospital stays, irrespective of EuroSCORE matching.
- Sodium concentrations in clinical CPB primes varied widely (0-160 mmol/L).
- Mathematical modeling indicated that patient size, sex, hemoglobin, prime solution, and volume significantly affect serum sodium at CPB initiation.
Conclusions:
- Preoperative hyponatremia is associated with prolonged hospitalization in CPB patients.
- Variability in prime composition and patient factors critically influence intraoperative serum sodium levels.
- Further research is required to understand the neurological implications of rapid serum sodium shifts during CPB.
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