Studies on the physiopathology of chronic obstructive pulmonary disease in the horse. III. The intrathoracic pressure.

This study compares the intrathoracic pressure of healthy horses with horses suffering from Chronic Obstructive Pulmonary Disease (COPD) using direct intrapleural cannulation.

Methods and Subjects

• The study was conducted on 31 horses. Of these, 17 were clinically normal while the remaining 14 had been diagnosed with Chronic Obstructive Pulmonary Disease (COPD).
• In order to measure the intrathoracic pressure of these animals, the researchers used a method known as direct intrapleural cannulation. This is a technique wherein a tube is inserted into the pleural space between the lungs and the chest wall to access and record the pressure within.

Results

• The measurements obtained revealed significant differences between the healthy horses and those with COPD with regards to max. Ppl (maximum intrapleural pressure) and max. delta Ppl (maximum change in intrapleural pressure).
• Interestingly, the min. Ppl (minimum intrapleural pressure) for both groups showed no significant difference. This suggests that COPD in horses primarily affects their max. Ppl and max. delta Ppl.

Discussion

• The researchers discussed these outcomes in comparison with the results of previous similar studies. The major difference in the maximum pressure values between the two groups suggests that COPD has a noticeable impact on the horse’s pulmonary system, particularly affecting the maxima of intrathoracic pressure.
• The measurements of min. Ppl not showing any significant variation indicates that while COPD affects the maximum pressure, it doesn’t seem to have a similar impact on the minimum pressure. This aspect of COPD’s influence on a horse’s respiratory system could be an area for further in-depth research.