Prerenal Oliguria: Diff Dx

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    Vol. Depletion
    CHF
    Shock
    3rd Spacing
    NSAIDS
    Hepatorenal Syn.
    Renal Artery Stenosis
    Renal Artery Emboli
- Pre-renal azotemia arises from inadequate perfusion of the kidneys;
    - this must be considered in the patient with hemorrhage, an antecedent
        h/o CHF, a rapid diuresis induced by diuretic, third spacing
        (ascities, pleural effusions)