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Oliguria in patients with normal renal function.

G P Zaloga1, S S Hughes

  • 1Department of Anesthesia/Critical Care, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, North Carolina 27103.

Anesthesiology
|April 1, 1990
PubMed
Summary
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Oliguria in critically ill patients is often due to renal hypoperfusion and excess antidiuretic hormone (ADH). This study found that normovolemic oliguric patients showed distinct biochemical markers compared to hypovolemic ones.

Area of Science:

  • Nephrology
  • Critical Care Medicine
  • Internal Medicine

Background:

  • Oliguria is a common complication in critically ill patients.
  • It can arise from various causes, including prerenal, renal, and postrenal factors.
  • Oliguria frequently occurs even with normal blood urea nitrogen and creatinine levels, and most patients do not progress to renal failure.

Purpose of the Study:

  • To prospectively investigate the etiology of oliguria in 100 intensive care unit (ICU) patients.
  • To differentiate causes of oliguria in critically ill patients, particularly those with normal renal function markers.

Main Methods:

  • Prospective study of 100 ICU patients.
  • Categorization of oliguric patients into hypovolemic and normovolemic groups based on clinical assessment.

Related Experiment Videos

  • Analysis of serum and urine electrolytes, osmolality, antidiuretic hormone (ADH) levels, and response to saline bolus.

    • Main Results:

    • Oliguria (less than 0.33 ml.kg-1.h-1 X 2 h) developed in 18% of patients.
    • Normovolemic oliguric patients had significantly lower serum osmolalities and sodium concentrations compared to hypovolemic patients.
    • Normovolemic patients exhibited higher urine sodium, fractional excretion of sodium, and renal failure indices, and did not improve urine output after saline administration.

    Conclusions:

    • Oliguria in critically ill patients is frequently associated with renal hypoperfusion and excess ADH.
    • Distinct biochemical profiles can help differentiate causes of oliguria in normovolemic versus hypovolemic critically ill patients.
    • Normovolemic oliguria in this setting may indicate intrinsic renal issues or inappropriate ADH secretion unresponsive to volume resuscitation.