Hemodynamic studies in acute-on-chronic liver failure

Area of Science:

• Hepatology
• Cardiovascular Physiology
• Critical Care Medicine

Background:

• Decompensated cirrhosis and acute liver failure present with circulatory dysfunction, characterized by elevated cardiac output (CO) and portal pressure, alongside low systemic vascular resistance (SVR).
• Hemodynamic alterations in acute-on-chronic liver failure (ACLF) remain understudied.
• This study investigates the portal, systemic, and pulmonary hemodynamics in ACLF patients.

Purpose of the Study:

• To characterize the hemodynamic profile of patients with acute-on-chronic liver failure (ACLF).
• To compare the hemodynamics of ACLF patients with those of compensated and decompensated cirrhotic patients.
• To explore the relationship between portal pressure and variceal size in ACLF.

Main Methods:

• A comparative hemodynamic study involving 144 patients with portal hypertension.
• Patients were stratified into three groups: ACLF, compensated cirrhosis, and decompensated cirrhosis (48 patients each).
• Assessment included systemic, portal, and pulmonary hemodynamics, with subgroup analysis based on variceal size in ACLF patients.

Main Results:

• ACLF patients demonstrated lower mean arterial pressure (MAP) and SVR than compensated cirrhotics, comparable to decompensated cirrhotics.
• Cardiac output (CO) in ACLF patients was higher than in compensated cirrhotics and similar to decompensated cirrhotics.
• Hepatic venous pressure gradient (HVPG) in ACLF was higher than in compensated but lower than in decompensated cirrhotics; HVPG in ACLF with large varices mirrored that of decompensated cirrhotics.

Conclusions:

• Systemic hemodynamics in ACLF patients closely resemble those in decompensated cirrhosis.
• Portal pressure is significantly elevated in ACLF compared to compensated cirrhosis.
• In ACLF patients with large varices, portal pressure approximates levels seen in decompensated cirrhosis, indicating a severe hemodynamic state.