Equine thoracoscopy: normal anatomy and surgical technique.

The research paper is a study on the normal anatomy and surgical technique of thoracoscopy in horses. Six healthy horses were subjected to a thoracoscopic examination to observe the thoracic structures, investigating different intercostal spaces for the procedure.

Research Methodology

• The researchers conducted the study on six healthy horses aged between 3 to 10 years.
• Both the left and right of the horses’ thoracic regions were examined using a rigid telescope.
• The horses were kept in stocks during the procedure and were sedated using a continuous influx of detomidine.
• Thoracoscopy was performed twice, during two separate 15-minute pneumothorax periods. A minimum period of 30 days was maintained between the procedures.
• The thoracic structures observed during the procedure were captured via a 57 cm, 10 mm diameter, 30 degrees rigid telescope attached to a digital camcorder.
• The telescope was inserted via three different intercostal spaces, the 8th, 10th, and 12th spaces, which were selected randomly among the horses.

Key Findings

• During the thoracoscopy, the lung, aorta, oesophagus, and diaphragm were easily visible in both the left and right hemithorax.
• In the right hemithorax, the researchers also identified the azygos vein, thoracic duct, and pulmonary veins.
• All horses handled the procedure well, with signs of discomfort – such as an increased respiratory rate, coughing, a decreased level of sedation – observed in just one horse associated with lung collapse, pneumothorax on two occasions, and when the thorax was approached through the 8th intercostal space.
• The researchers found that surgery performed via the 8th intercostal space was complicated by the stiffness of the 8th and 9th ribs, and the greater musculature which restricted easy cranial and caudal movements of the telescope.

Implication of Findings

The results of this study are significant as they offer a comprehensive understanding of equine thoracic anatomy and the intricacies of thoracoscopic procedures. They highlight the importance of selecting suitable intercostal spaces for performing the procedure and maintaining a certain level of sedation in the subject for ensuring the procedure’s success. The observations can serve as a guide for future research and improve clinical efficiency and outcomes in equine thoracoscopic surgeries.