Tricuspid valve disease occurs when this function is impaired. The most common form of tricuspid disease, known as tricuspid regurgitation or insufficiency, occurs when the valve cannot close adequately, resulting in the backward leakage of blood into the right atrium with each heart contraction. Alternatively, the valve may become stiff and narrowed, preventing the forward flow of blood from the atrium to the ventricle, known as tricuspid stenosis.