Hepatorenal Syndrome

Hepatorenal Syndrome is a topic covered in the 5-Minute Emergency Consult.

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Basics

Description

  • Renal failure (RF) in patients with acute or chronic liver disease with no other identifiable cause of renal pathology.
  • Hepatorenal syndrome (HRS) represents significant decline in renal perfusion due to severe liver disease:
    • Type I HRS:
      • Acute form with spontaneous RF in patients with liver disease
      • Rapidly progressive
      • Decrease in creatinine clearance (CrCl) by 50% or doubling of Cr in 2 wk (>2.5)
      • 90% mortality within 3 mo
      • Seen with acute liver failure or alcoholic hepatitis
      • Oliguric or anuric
    • Type II HRS:
      • Slow course of RF
      • Seen in patients with diuretic resistant ascites
      • Lower mortality rate than type I HRS
  • Hallmarks of HRS:
    • Prerenal disease
    • Reversible renal vasoconstriction and mild systemic hypotension
    • Kidneys have normal histology and structure.
    • Lack of improvement in renal function after volume expansion
  • Liver disease causes systemic vasodilation with decrease in arterial blood volume:
    • Reflex activation of sympathetic nervous system
    • Activation of rennin–angiotensin–aldosterone system (RAAS)
    • Stimulation of numerous vasoactive substances:
      • Nitric oxide
      • Prostacyclin
      • Atrial natriuretic peptide (ANP)
      • Arachidonic acid metabolites
      • Platelet-activating factor
      • Endothelins
      • Catecholamines
      • Angiotensin II
      • Thromboxane
  • Action of vasoconstrictors prevails over vasodilator effects:
    • Renal hypoperfusion ensues due to renal cortical vasoconstriction.
    • Decrease in renal blood flow and glomerular filtration rates (GFRs)
  • Decreased urine sodium excretion (U Na <10 mEq/day)
  • Incidence of HRS:
    • 18% at 1st year, 39% at 5 yr
  • Hyponatremia and high plasma renin levels are risk factors.

Etiology

  • Chronic liver disease, especially alcohol related (cirrhosis, severe alcoholic hepatitis)
  • Fulminate hepatic failure
  • Precipitating factors:
    • Decreased effective blood volume:
      • GI bleeding
      • Vigorous diuresis
      • Large-volume paracentesis
    • Use of nephrotoxic agent:
      • NSAIDs
      • Aminoglycoside
    • Sepsis:
      • Spontaneous bacterial peritonitis (SBP) leads to a 33% chance of developing RF during that year
      • Prophylaxis of SBP reduces the chance of developing acute RF

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Citation

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TY - ELEC T1 - Hepatorenal Syndrome ID - 307452 Y1 - 2016 PB - 5-Minute Emergency Consult UR - https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307452/all/Hepatorenal_Syndrome ER -