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Renal function in children undergoing cardiac operations.

E N Ellis, B H Brouhard, V R Conti

    The Annals of Thoracic Surgery
    |August 1, 1983
    PubMed
    Summary
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    Post-cardiac surgery, cyanotic children exhibit elevated serum uric acid (SUA) levels. This hyperuricemia may stem from increased endogenous production, not impaired renal function, in pediatric patients.

    Area of Science:

    • Pediatric Cardiology
    • Nephrology
    • Biochemistry

    Background:

    • Cardiac surgery in children can lead to renal complications.
    • Uric acid crystaluria has been observed postoperatively in pediatric cardiac surgery patients.
    • Renal insufficiency is a serious concern following cardiac procedures.

    Purpose of the Study:

    • To prospectively evaluate renal function in pediatric patients undergoing open-heart surgery.
    • To compare renal function and serum uric acid levels between acyanotic and cyanotic children post-cardiac surgery.
    • To investigate the reliability of free water clearance (CH2O) as an indicator of renal insufficiency in children.

    Main Methods:

    • Prospective study comparing 8 acyanotic and 5 cyanotic children.
    • Measurement of preoperative and postoperative renal function parameters.

    Related Experiment Videos

  • Analysis of free water clearance (CH2O) and serum uric acid levels (SUA).

    • Main Results:

    • No significant preoperative differences between acyanotic and cyanotic groups.
    • Postoperative CH2O showed wide variability, potentially unreliable for diagnosing renal insufficiency in children.
    • Significantly higher postoperative SUA levels in cyanotic children (10.4 mg/dl) compared to acyanotic children (5.3 mg/dl).

    Conclusions:

    • Free water clearance (CH2O) may not be a reliable marker for renal insufficiency in pediatric cardiac surgery patients.
    • Cyanotic children exhibit significant postoperative hyperuricemia (elevated serum uric acid).
    • Elevated SUA in cyanotic children is likely due to increased endogenous production, possibly linked to the resolution of cyanosis, rather than impaired renal excretion.