Sorbitol clearance: a parameter reflecting liver plasma flow in the rat

Area of Science:

• Pharmacokinetics
• Hepatology
• Physiology

Background:

• Functional liver plasma flow is crucial for liver function.
• Measuring liver perfusion accurately is essential for understanding liver health.
• D-sorbitol's properties suggest its potential for clearance studies.

Purpose of the Study:

• To validate D-sorbitol plasma clearance as a reliable method for assessing liver perfusion in male Wistar rats.
• To determine the requirements for accurate liver perfusion measurements using D-sorbitol.
• To evaluate D-sorbitol's hepatic extraction and clearance under various physiological conditions.

Main Methods:

• Administered D-sorbitol intravenously to male Wistar rats.
• Analyzed plasma disappearance curves using first-order kinetics and a two-compartment model.
• Calculated D-sorbitol plasma clearance via area under the curve and compartmental analysis.
• Assessed D-sorbitol hepatic extraction and renal output in control and surgically altered rats.

Main Results:

• D-sorbitol plasma disappearance followed first-order kinetics and a two-compartment model.
• D-sorbitol plasma clearance estimates were consistent across different calculation methods.
• Hepatic extraction of D-sorbitol was near-complete in controls but reduced after partial hepatectomy.
• Liver plasma flow measurements showed significant reductions following porta-caval shunt, hepatic artery ligation, and partial hepatectomy.

Conclusions:

• D-sorbitol plasma clearance is a valid and reliable method for measuring functional liver plasma flow in rats.
• This technique accurately reflects changes in liver perfusion induced by surgical manipulations.
• D-sorbitol demonstrates suitable pharmacokinetic properties for non-invasive liver perfusion assessment.