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Ascites in liver diseases.

P Gentilini1, G Laffi

  • 1Istituto di Clinica Medica Generale e Terapia Medica II, Università degli Studi di Firenze, Italy.

Annali Italiani Di Medicina Interna : Organo Ufficiale Della Societa Italiana Di Medicina Interna
|January 1, 1991
PubMed
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Ascites in cirrhosis result from impaired renal sodium handling. Theories suggest underfilling, overflow, or vasodilation causes fluid retention and complications like hepatorenal syndrome.

Area of Science:

  • Hepatology
  • Nephrology
  • Gastroenterology

Background:

  • Cirrhosis commonly leads to renal sodium retention and ascites.
  • Ascites formation involves hormonal and hemodynamic changes.
  • Theories on ascites pathogenesis include underfilling, overflow, and vasodilation.

Purpose of the Study:

  • To review the pathophysiology of ascites in cirrhosis.
  • To discuss the role of renal sodium handling and hemodynamic derangements.
  • To explore current theories on ascites formation.

Main Methods:

  • Literature review of existing theories on ascites.
  • Analysis of hemodynamic and hormonal changes in cirrhosis.
  • Comparison of underfilling, overflow, and vasodilation theories.

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Main Results:

  • Peripheral arteriolar vasodilation, particularly in the splanchnic circulation, is a key factor.
  • Vascular underfilling, not necessarily plasma volume reduction, triggers compensatory mechanisms.
  • In decompensated cirrhosis, vasodilation, portal hypertension, and low oncotic pressure promote ascites.

Conclusions:

  • Vascular underfilling is central to ascites formation in cirrhosis.
  • Compensatory mechanisms maintain volume in compensated cirrhosis but fail in decompensated states.
  • Severe underfilling is observed in hepatorenal syndrome.