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A technique for long-term venous cannulation in rats.

D Koeslag, A S Humphreys, J C Russell

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |November 1, 1984
    PubMed
    Summary

    This study presents a new method for long-term blood sampling in rats using heparin-treated Silastic tubing and a mesh-stabilized cannula. This technique ensures cannula patency for extended periods, crucial for studying obese hyperlipemic animals.

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    Area of Science:

    • Veterinary Medicine
    • Surgical Techniques
    • Animal Models

    Background:

    • Long-term blood sampling is essential for studying chronic conditions in animal models.
    • Existing techniques often fail to maintain cannula patency over extended periods, especially in models of obesity and hyperlipidemia.
    • The need for a reliable, long-term vascular access method in rodent research is critical.

    Purpose of the Study:

    • To develop and evaluate a novel surgical technique for achieving long-term vascular access in rats.
    • To improve cannula patency rates for repeated blood sampling in studies involving obese hyperlipemic animals and normal controls.
    • To provide a reliable method for long-term monitoring of physiological parameters in research animals.

    Main Methods:

    • A new technique utilizing thromboresistant heparin-treated Silastic tubing and a mesh-stabilized metal cannula was developed.

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  • The cannula was inserted into the vena cava, with the tip positioned near the hepatic vein termination.
  • The system was maintained with heparinized saline flushes at biweekly intervals.

    • Main Results:

    • The developed technique demonstrated significantly improved long-term cannula patency.
    • 59% of cannulas remained patent and functional for blood withdrawal at 120 days.
    • While 100% patency was observed at 30 days, a significant number remained functional up to 200 days, with random loss of function after this period.

    Conclusions:

    • The described heparin-treated Silastic tubing and mesh-stabilized cannula technique provides a reliable solution for long-term vascular access in rats.
    • This method overcomes the limitations of previous techniques, enabling sustained blood sampling for extended study durations.
    • The improved cannula patency supports long-term physiological studies in animal models, including those with metabolic abnormalities like obesity and hyperlipidemia.