Vegetative endocarditis in an Appaloosa gelding.

The study outlines the case of a 5-year-old Appaloosa gelding (a type of horse) that was diagnosed with vegetative endocarditis characterized by intermittent multiple joint swelling, weight loss, and anemia. Despite extensive testing and treatments, the horse was euthanized after two months due to non-response to therapies administered.

Background and Symptoms

• The Appaloosa gelding was brought in with complaints of intermittent multiple joint swelling, weight loss, and anemia. These symptoms offered the primary basis for the pathophysiological investigations undertaken.

Physical Examination and Clinical Pathology

• During the physical examination of the horse, a noticeable grade IV/VI holodiastolic murmur was recorded. The murmur, which was louder on the left side, hinted at potential cardiac issues.
• Further clinical pathology recorded a marked hyperproteinemia; an abnormal increase in the amount of protein in the blood – another significant clinical sign of potential infection, inflammation, or other abnormal physiological process.

Echocardiography Findings

• An echocardiography was performed to visualize the structures inside the heart. This diagnostic tool revealed a large vegetative lesion on one of the aortic valve cusps. A vegetative lesion in this area of the heart provides a strong indication of vegetative endocarditis.

Microbiological Investigation

• In order to identify the causative agent of the endocarditis, blood cultures were performed. However, these studies failed to provide a clear identification of the causative organism responsible for the infection. Hence, the source of the endocarditis remained unidentified.

Therapeutic Approach and Outcome

• Based on the clinical signs and diagnostic imaging, empiric antibiotic therapy was started. Unfortunately, the horse did not respond to the treatment. This was deemed non-responsive or refractory to the therapy.
• As the condition of the horse did not improve and considering the severity of vegetative endocarditis, the decision was made to euthanize the horse after approximately 2 months of unsuccessful therapy.