Congenital malformation of the tricuspid valve in cats
A congenital malformation of the tricuspid valve in cats is a heart defect present from birth. The tricuspid valve lies between the right atrium and the right ventricle. Its function is to regulate blood flow in the right side of the heart: blood should flow from the right atrium into the right ventricle and not flow back when the ventricle contracts. If this valve is malformed, it cannot close properly or, less commonly, is narrowed. This often leads to blood flowing back into the right atrium with each heartbeat. In international veterinary literature, this is often described as "tricuspid valve dysplasia." The Merck Veterinary Manual explains that it is a congenital malformation of the valve leaflets or other components of the tricuspid valve complex.
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