Pet Health
Condition Overview
Bacterial endocarditis is an infection of the heart valves and the lining of the heart. This disease is not common.
Symptoms
As the bacteria invade the heart valves, they produce ulcerations and small wart-like bumps called vegetations. The effects on the valves are similar to those of chronic valvular disease. In addition, parts of infected vegetation can break off and spread the infection to other organs. This seeding process causes a variety of signs including fever, shaking, chills, swollen joints, lameness, spontaneous bleeding, blindness, behavioral and personality changes, unstable gait, stupor, and seizures. These signs are non-specific and may suggest a number of other diseases.
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Causes
It is caused by bacterial species that gain entrance to the circulation system through the wounds and infections elsewhere in the body. In many cases, the actual source of infection is unknown. Dogs on corticosteroids and immunosuppressant drugs are at increased risk, as are mid-size and large dogs.
Diagnosis
The presence of a heart murmur, particulatly a new or changing murmur, suggests a diagnosis of bacterial endocarditis. This can be confirmed by ECG, chest X-rays, and echocardiography. Blood cultures identify the causative bacteria.
Treatment
Antibiotics must be selected based on blood culture and sensitivity tests. To eliminate vegetations, long-term antibiotic therapy (2 - 4 months is required. The dog should be monitored closely for signs of congestive heart failure, which may appear suddenly, and for the development of antibiotic-resistant organisms.
Dogs with less severe valve disease may recover with only mild permanent damage. The prognosis is guarded for dogs with mitral valve involvement and poor for those with aortic valve involvement.
Prevention
There is no prevention for this condition.
Support
Please contact your veterinarian with questions regarding this condition.
Sources
Dog Owners Home Veterinary Handbook
Publisher: Wiley Publishing, 2007
Website: http://www.wiley.com/WileyCDA/
Authors: Debra M. Eldredge, Liisa D. Carlson, Delbert G. Carlson, James M. Giffen MD
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