A simplified method for chronic portal vein cannulation in the rat

Area of Science:

• Physiology
• Surgical Techniques

Background:

• Chronic cannulation is essential for physiological research in conscious animals.
• Previous methods for portal vein cannulation in rats were often invasive or obstructed blood flow.

Purpose of the Study:

• To describe a simple, minimally invasive technique for chronic cannulation of the rat portal vein.
• To enable repeated, precise blood sampling from the portal vein in conscious, undisturbed rats.
• To combine portal vein cannulation with superior vena cava cannulation for simultaneous sampling.

Main Methods:

• A straight cannula was used for precise tip location in the portal vein.
• The technique ensured no obstruction of portal vein blood flow.
• Simultaneous blood sampling was performed from cannulas in the portal vein and superior vena cava.
• Sampling occurred at 15-minute intervals over 6-hour periods.

Main Results:

• The described technique allowed for chronic cannulation and repeated blood sampling from the conscious rat portal vein.
• Precise cannula tip location was achieved without obstructing blood flow.
• Simultaneous blood sampling from the portal vein and superior vena cava was successful.
• The rats tolerated the cannulation and sampling procedures well.

Conclusions:

• This technique offers a simple and effective method for chronic portal vein cannulation in rats.
• The method facilitates repeated blood sampling in conscious, undisturbed animals, crucial for physiological studies.
• The ability to perform simultaneous sampling from the portal vein and superior vena cava enhances the study of circulatory dynamics.