Analysis of scintigraphical lung images before and after treatment of horses suffering from chronic pulmonary disease.

This research examines changes to lung functioning in horses suffering from chronic pulmonary disease both before and after treatment, using a measurement called the inhalation to perfusion (I/Q) ratio. The research found that treatment improved the horses’ lung function, but there was still variation in the I/Q ratio post-treatment.

Introduction

• The research presents an analytical approach to evaluating the impact of chronic pulmonary disease in horses on the ratio of inhalation (I) to blood flow through the lungs, or perfusion (Q).
• Using scintigraphical images (a type of imaging that uses radioactive substances), the researchers were able to assess whether the disease induced mismatches in the I/Q ratio.
• The objective was to understand how effectively medical treatment could restore the I/Q distribution pattern to equal that of healthy, or control, horses.

Methodology

• The researchers compared the I/Q matching of a control group of horses to that of a group of diseased horses, both before and after treatment.
• In addition to this, the results of the I/Q analysis were compared with the alveolar-arterial PO2 difference (AaDO2), a measure of oxygenation and lung function.

Results

• The results indicated that there was a mismatch between inhalation and perfusion in the diseased horses before treatment.
• Post-treatment, there was an improvement in the lung function of the diseased horses.
• However, heterogeneity or variance was still present in the I/Q distribution after the horses had been treated.
• The parameters used in the I/Q analysis correlated well with the ratio of lung ventilation (VA) and pulmonary blood flow (Q), as determined through measuring the AaDO2.

Conclusions

• The study proves that chronic pulmonary disease in horses disrupts the normal balance between inhalation and perfusion, indicating impaired lung function.
• While medical treatment improved lung function, it did not completely normalize the I/Q ratio, illustrating the lasting impact of the disease.
• Finally, the correlation between I/Q analysis and AaDO2 measurement demonstrates the potential for these methods to be used in a complementary manner to evaluate lung function in horses with chronic pulmonary conditions.