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Reversible truncal vagotomy in conscious dogs
Gastroenterology
|September 1, 1983
Summary
Researchers developed a new cooling jacket for reversible vagal denervation in dogs, enabling targeted study of gastric motility without affecting cardiac or pulmonary functions.
Area of Science:
- Gastroenterology
- Neuroscience
- Surgical Innovation
Background:
- Previous vagal denervation methods caused unintended cardiac and pulmonary denervation.
- Cervical cooling techniques yielded inconsistent results compared to surgical vagotomy.
Purpose of the Study:
- To develop a technique for reversible vagal denervation below cardiac and pulmonary branches.
- To study gastric motility using a localized denervation approach.
Main Methods:
- A novel "J"-shaped cooling jacket with a thermistor was implanted around the distal thoracic vagal trunk in dogs.
- Cryotherapy using -70°C ethanol circulation reversibly cooled the vagal trunk.
- Gastric motility was monitored using strain gages and electrodes.
Main Results:
- Vagal denervation via thoracic cooling reversibly blocked insulin-induced gastric contractions.
- Blockade occurred at 2°C-6°C and resolved upon rewarming.
- Nerve function remained intact for over 40 days post-procedure.
Conclusions:
- This technique allows for targeted, reversible vagal denervation of the gastrointestinal tract.
- It provides a reliable method for studying gastric motility regulation.
- The method is safe and preserves nerve function for extended periods.
