Donut is a 3–month-old Dalmatian who was presented for evaluation of an asymptomatic heart murmur. Clinically, Donut appeared bright, active, and full of energy, with no obvious clinical signs at the time of presentation.
However, further diagnostic investigations, including echocardiography and electrocardiography, revealed the presence of a significant congenital cardiac defect. Donut was diagnosed with severe tricuspid valve dysplasia, characterised by an underdeveloped and abnormally formed tricuspid valve.
This structural abnormality has resulted in progressive right-sided cardiac volume overload, leading to enlargement of the right atrium and right ventricle, and arrhythmias. In more advanced stages, this condition is commonly associated with the development of right-sided congestive heart failure.
Typical clinical consequences may include ascites, defined as the accumulation of free fluid within the abdominal cavity, as well as exercise intolerance and reduced overall quality of life. Unfortunately, severe forms of tricuspid valve dysplasia are associated with a guarded to poor long-term prognosis and can negatively impact life expectancy. This highlights the importance of recommanding further investigations of any type of heart murmur or suspected arrhythmia.