Breed Occurrence
Dilated cardiomyopathy is most commonly seen in large breed dogs including the Doberman Pinscher, Cocker Spaniel, Springer Spaniel, Boxer, Irish Setter, German Shepherd Dog, Great Dane, St Bernard and Irish Wolfhound. It is usually seen in young adult male dogs (mean age of presentation to a veterinarian 4-6 years of age).
It is also seen in young to middle-aged cats (mean age reported to be 7.5 years) and, although all breeds can be affected, there is a higher incidence in the Siamese, Abyssinian and Burmese breeds. In cats this form of heart muscle disease was associated with taurine deficiency but this is now rare.
Signs
In dogs the condition can be present for a long time with no obvious symptoms, then the clinical signs often start suddenly and include the typical signs of heart failure including both forward and backward failure. Commonly seen signs include difficulty breathing (called dyspnoea), a cough, feinting, exercise intolerance and a swollen abdomen. Affected dogs often have reduced appetite and weight loss.
In cats signs include difficulty breathing, lethargy, vomiting and poor appetite. Feinting is rare in cats with this disease.
Ultrasound (called echocardiography)
Moving (M-mode) echocardiography is the best diagnostic tool to use to confirm the diagnosis of dilated cardiomyopathy because it clearly shows dilation of the heart chambers with severely reduced shortening fraction of the heart wall when the heart muscle contracts.
A Provet Educational Video on "An introduction to Echocardiography" by Malcolm Cobb and Rebecca Stepien can be obtained from the Provet On-line Store.
Also, Provet have launched an On-line Certificate Course on
Ultrasonography for veterinarians go to www.provet.co.uk/ultrasound/home.htm
Recently
it has been suggested that an imbalance in the oxidant-antioxidant system may be
involved in the cause of this disorder. .Click
here for more information
Prognosis
The prognosis is always guarded to poor at the outset with the average survival time being 6 months and 80% of dogs with atrial fibrillation die in this period. Dobermans often die within days or weeks and rarely survive for more than a year, whereas some breeds (including German Shepherds and Great Danes) often respond well and can survive more than 2 years.
The prognosis is good for dilated cardiomyopathy associated with taurine deficiency in cats, as correction of the nutritional deficiency effectively reverses the disease.
Updated January 2016