Quantitative reticuloendothelial function of liver and spleen in man

Area of Science:

• Nuclear medicine
• Medical imaging
• Physiology

Background:

• Reticuloendothelial system (RES) function is crucial for immune response.
• Assessing liver and spleen RES function separately is important for diagnosing liver diseases.
• Current methods may require complex procedures or multiple tracers.

Purpose of the Study:

• To develop and validate a method for separate determination of liver and spleen reticuloendothelial function.
• To evaluate the efficacy of the method in patients with liver cirrhosis.
• To establish a reliable and clinically applicable technique for RES function assessment.

Main Methods:

• Utilized a small-size 99Tcm-antimony sulphide colloid and gamma camera.
• Examined blood-background correction methods, employing a three-compartment model.
• Described hepatic and splenic colloid uptake using first-order kinetics.

Main Results:

• Achieved calculation of hepatic and splenic uptake with less than 5% error.
• Established reference values for hepatic (262 ml/min) and splenic (22 ml/min) clearance in healthy individuals.
• Observed decreased hepatic clearance and increased splenic clearance in patients with liver cirrhosis.

Conclusions:

• The described method accurately quantifies liver and spleen reticuloendothelial function.
• The technique is suitable for clinical studies and based on a sound physiologic model.
• In liver cirrhosis, the method reveals diminished hepatic RES function and a potential compensatory increase in splenic RES function.