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The biochemical consequences of cardiopulmonary bypass surgery in children
Insights
Serum enzyme activities in children undergoing cardiopulmonary bypass (CPB) surgery normalize within seven days. However, hemodilution from pump primes undesirably reduces essential constituents like magnesium and calcium post-surgery.
Area of Science:
- Pediatric Surgery
- Cardiovascular Surgery
- Biochemistry
Background:
- Cardiopulmonary bypass (CPB) is a critical procedure in pediatric cardiac surgery.
- Understanding the biochemical changes post-CPB is crucial for patient recovery.
- Serum enzyme levels and electrolyte balance are key indicators of physiological stress.
Purpose of the Study:
- To describe serum enzyme activity changes after pediatric CPB surgery.
- To investigate the impact of pump prime fluids on physiological constituents.
- To discuss implications of hemodilution and suggest monitoring parameters.
Main Methods:
- Monitoring serum enzyme activities (Aspartate aminotransferase, Alanine aminotransferase, Creatine kinase-MB) post-CPB.
- Analyzing concentrations of magnesium, calcium, and albumin in pump prime and circulation.
- Assessing changes in urea levels.
Main Results:
- Serum enzyme activities peaked and then steadily declined, returning to near-normal by day seven.
- CPB pump primes led to undesirable hemodilution, reducing magnesium, calcium, and albumin levels.
- These reduced concentrations persisted for several days post-bypass.
Conclusions:
- Enzyme leakage from tissues occurs after CPB but resolves within a week.
- Hemodilution from standard pump primes has significant physiological consequences in children.
- Routine monitoring of Aspartate aminotransferase, Alanine aminotransferase, CK-MB, magnesium, calcium, and urea for four days post-surgery is recommended.
Abstract:
The changes in serum enzyme activities after successful and uncomplicated cardiopulmonary bypass (CPB) surgery in children are described. After maximum serum enzyme activities were attained, they thereafter declined steadily without any secondary peaks of activity, to be at or near normal activities by the seventh day after surgery. The possible sources and mechanisms of enzyme leakage from tissues after CPB are discussed. The concentration of some physiologically important constituents were determined in pump prime fluids and in the common circulation on bypass. The consequences of haemodilution on small children were undesirably reduced concentrations of magnesium, calcium and albumin, and this state persisted for some days after the end of bypass. Some possible implications of such unphysiological pump primes are discussed. We suggest that ASp AT, Ala AT, CK-MB, magnesium, calcium and urea should be routinely monitored for the first four days after surgery.
