<unk>  is a congenital heart defect which affects the aortic, pulmonary, mitral, and tricuspid heart<unk> s.<unk>  of the mitral and tricuspid<unk> s can cause leakage of blood or stenosis.<unk>  of the mitral and tricuspid<unk> s - also known as the atrioventricular (AV)<unk> s - can appear as thickened, shortened, or notched<unk> s. The chordae tendinae can be fused or thickened. The papillary muscles can be enlarged or atrophied. The cause is unknown, but genetics play a large role. Dogs and cats with tricuspid<unk><unk>  often also have an open foramen ovale, an atrial septal defect, or inflammation of the right atrial epicardium. In dogs, tricuspid<unk><unk>  can be similar to Ebstein's anomaly in humans. Mitral<unk>  stenosis is one of the most common congenital heart defects in cats. In dogs, it is most commonly found in Great Danes, German Shepherd Dogs, Bull Terriers, Golden Retrievers, Newfoundlands, and Mastiffs. Tricuspid<unk><unk>  is most common in the Old English Sheepdog, German Shepherd Dog, Weimaraner, Labrador Retriever, Great Pyrenees, and sometimes the Papillon. It is inherited in the Labrador Retriever. The disease and symptoms are similar to progression of acquired<unk>  disease in older dogs.<unk>  leakage leads to heart enlargement, arrhythmias, and congestive heart failure.<unk>  can be tolerated for years or progress to heart failure in the first year of life. Diagnosis is with an echocardiogram. The prognosis is poor with significant heart enlargement.
Heart valve dysplasia
Congenital limb deformities
Acyanotic heart defect
Congenital heart block
Cyanotic heart defect
Heart septal defect
Valvular heart disease
Broken Heart