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Effective liver blood flow: determination by galactose clearance
Summary
Galactose clearance accurately measures effective liver blood flow, a key indicator of liver function. This method shows promise for assessing liver health in both healthy individuals and cirrhosis patients.
Area of Science:
- Hepatology
- Clinical Chemistry
- Physiology
Background:
- Effective liver blood flow is crucial for metabolic exchange within the liver.
- Assessing liver blood flow is vital for diagnosing and managing liver diseases.
- Existing methods for measuring liver blood flow can be invasive or lack precision.
Purpose of the Study:
- To evaluate galactose clearance as a non-invasive method for measuring effective liver blood flow.
- To validate a new fluorometric assay for precise measurement of low galactose concentrations.
- To compare galactose clearance with direct liver blood flow measurements in animal models.
Main Methods:
- Continuous infusion of 5% D-galactose at 50 mg/min.
- Measurement of low blood galactose concentrations using a new fluorometric assay (precision +/- 0.2 mg/dl).
- Comparison of galactose clearance with flow-probe liver blood flow in dogs.
Main Results:
- Healthy individuals showed plasma galactose clearance of 1366 +/- 172 ml/min with 95% hepatic extraction.
- Patients with advanced cirrhosis exhibited reduced clearance (835 +/- 87 ml/min) with variable hepatic extraction (60-95%).
- Galactose clearance in dogs did not significantly differ from direct liver blood flow measurements.
Conclusions:
- Galactose clearance is a reliable and precise indicator of effective liver blood flow.
- This method can differentiate liver blood flow in healthy individuals versus those with cirrhosis.
- Galactose clearance offers a valuable tool for assessing liver function and disease progression.