Impact of Low Stroke Volume Index on Liver Function in Heart Failure

Understanding the Cardiac-Hepatic Connection

The American Journal of Kidney Diseases suggests that venous congestion is the dominant mechanism causing liver injury in heart failure, transmitted backward through the hepatic veins and causing increased hepatic sinusoidal pressure 1
The liver can typically tolerate significant reductions in arterial flow due to its dual blood supply from both the hepatic artery and portal vein, as noted by the American Journal of Kidney Diseases 1
The net effect on liver perfusion depends on "hepatic perfusion pressure" - analogous to kidney perfusion pressure - which is the difference between mean arterial pressure and central venous pressure, according to the American Journal of Kidney Diseases 1

The American Journal of Kidney Diseases recommends that most patients with heart failure and low cardiac output do not develop severe liver dysfunction unless there is concurrent severe right heart failure with marked venous congestion 1
Mild elevations in liver enzymes (AST, ALT) are common but typically remain less than 2-3 times the upper limit of normal, as stated by Gastroenterology 4 and the Journal of the American College of Radiology 5
Synthetic function (albumin, INR) usually remains preserved unless there is chronic severe congestion, according to Gastroenterology 4

The following panel should be monitored to assess hepatic impact of low cardiac output state, including AST and ALT, alkaline phosphatase, total and direct bilirubin, INR/PT, and albumin, as recommended by Gastroenterology 4 and the Journal of the American College of Radiology 5
Initial assessment should be followed by serial monitoring based on severity, with frequency depending on the level of transaminase elevation, as suggested by Gastroenterology 4 and the Journal of the American College of Radiology 5

Mild transaminase elevations (2-3x normal) are expected in heart failure and do not necessarily indicate severe hepatic injury, as noted by Gastroenterology 4 and the Journal of the American College of Radiology 5
Creatinine-based eGFR underestimates true kidney function in patients with low muscle mass from heart failure cachexia, according to the American Journal of Transplantation 7 and the American Journal of Transplantation 6

Treatment focuses on improving cardiac output and reducing venous congestion, with guideline-directed medical therapy for heart failure, as recommended by the American Journal of Kidney Diseases 1
SGLT2 inhibitors reduce heart failure hospitalizations and may improve kidney function, according to Diabetes Care 9
Diuretics reduce venous congestion but must be carefully titrated to avoid worsening kidney function from over-diuresis, as noted by the American Journal of Kidney Diseases 1