Pleuritis secondary to pneumonia or lung abscessation in 90 horses.

The research article examines a disease known as pleuritis, which was observed in horses that were secondary to pneumonia or lung abscessation, identifying key patterns, risk factors, and outcomes.

Introduction and Methodology

• The study investigated 122 horses with pleural effusion, a medical condition where excess fluid accumulates between the layers of the pleura, the membrane that lines the lungs.
• 90 (73.8%) of these horses presented pleuritis secondary to pneumonia or lung abscessation. Pleuritis refers to inflammation of the pleura, caused in this case by underlying lung conditions.
• The study took into account various factors such as the breed, age, and sex of the horse, hematologic values, laboratory findings related to pleural fluid, and the isolation of bacteria like Escherichia coli from the pleural fluid.

Results and Findings

• Of the total, 51 horses either died or had to be euthanized due to their condition.
• Thoroughbred and Standardbred racehorses showed the highest prevalence of this condition. This might suggest an association with intensive training or housing conditions, but further research would be needed to establish this conclusively.
• The study found that 11 (12.2%) of the affected horses were post-surgical patients, implying a possible correlation between surgical procedures and the occurrence of this condition.
• Another pattern that emerged was that 22 (24.4%) of the horses had been transported over 500 miles. This could potentially suggest stress or environmental changes as contributing factors.
• However, no clear relationship was found linking the final outcome of the disease with the age, sex, breed, hematologic values, or laboratory findings relating to pleural fluid.
• Significantly, there was a higher mortality rate among horses where the bacteria Escherichia coli had been isolated from the pleural fluid. This implies that E. coli infection might increase the severity of the condition.

Follow-up and Conclusion

• The authors followed up on 38 of the 39 surviving horses. Among these, 18 (46.2%) fully recovered and could perform as well as they did before they fell ill.
• 10 (25.6%) horses were returned for lighter duties such as breeding or for pleasure use, with no attempt made to return them to racing.
• The follow-up status of 5 horses was not available, 4 horses had just been discharged from the hospital, and 2 horses were reportedly underperforming compared to their pre-illness abilities.