Techniques for thoracic duct cannulation without thoracotomy in piglets.

Area of Science:

• Veterinary Medicine
• Immunology
• Pathogenesis Research

Background:

• Pigs are natural hosts for zoonotic pathogens like influenza viruses and Staphylococcus aureus.
• Pulmonary infections pose significant challenges in the swine industry, exemplified by porcine reproductive and respiratory syndrome virus.
• Understanding swine pulmonary infection pathogenesis is crucial for vaccine development.

Purpose of the Study:

• To develop a minimally invasive method for in vivo sampling of efferent pulmonary lymph in pigs.
• To facilitate the study of swine pulmonary infection pathogenesis at the disease onset.
• To enable real-time monitoring of lymph composition for disease process investigation.

Main Methods:

• Surgical cannulation of the thoracic duct at its junction with the external jugular vein in pigs.
• Collection of thoracic duct lymph samples at various time points post-fasting and post-meal.
• Monitoring triglyceride and cholesterol levels in collected lymph samples.

Main Results:

• Successful cannulation of the thoracic duct without thoracotomy.
• Lymph triglyceride levels correlated with its milky appearance, unlike cholesterol levels.
• Demonstrated feasibility of collecting pulmonary lymph in real-time.

Conclusions:

• The described surgical techniques offer a novel strategy for collecting pulmonary lymph from the thoracic duct non-invasively.
• This pig model provides a valuable tool for studying pulmonary infections and developing targeted interventions.
• The methodology opens new avenues for real-time investigation of disease mechanisms in swine pulmonary infections.