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Urinary osmolal changes in renal dysfunction following open-heart operations

T Heimann, S Brau, H Sakurai

    The Annals of Thoracic Surgery
    |July 1, 1976
    PubMed
    Summary

    Early after open-heart surgery, reduced free-water clearance can predict kidney dysfunction. Monitoring this metric helps prevent severe renal failure and manage fluid overload in patients post-bypass.

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    Area of Science:

    • Nephrology
    • Cardiovascular Surgery
    • Critical Care Medicine

    Background:

    • Open-heart surgery often involves cardiopulmonary bypass, which can impact renal function.
    • Postoperative renal dysfunction is a significant complication following cardiac procedures.
    • Early identification of patients at risk for renal impairment is crucial for timely intervention.

    Purpose of the Study:

    • To evaluate the predictive value of early postoperative free-water clearance and urinary osmolality for renal dysfunction after open-heart surgery.
    • To determine if these urinary parameters can identify patients likely to develop elevated blood urea nitrogen (BUN) levels.
    • To assess the sensitivity of free-water clearance versus urinary osmolality in detecting early renal impairment.

    Main Methods:

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  • Prospective study of 40 consecutive patients undergoing open-heart procedures with hyperosmolar perfusion prime.
  • Serial measurements of urinary osmolality and calculation of free-water clearance within the first 18 hours post-bypass.
  • Definition of postoperative renal dysfunction as a BUN level > 50 mg/100 ml.

    • Main Results:

    • Urinary osmolality increased in all patients, but less significantly in those who later developed renal dysfunction.
    • Free-water clearance became significantly less negative by 2 hours post-bypass in patients who developed renal dysfunction.
    • Free-water clearance demonstrated higher sensitivity than urinary osmolality for predicting subsequent renal dysfunction (elevated BUN).

    Conclusions:

    • Early postoperative free-water clearance is a sensitive indicator of impending renal dysfunction after open-heart surgery.
    • Monitoring free-water clearance allows for early recognition of renal impairment, facilitating preventative measures.
    • Timely identification of renal dysfunction can help avoid fluid overload and progression to renal failure.