A 55-year-old man with long-standing rheumatic mitral stenosis presents with ascites, pedal edema, and a pansystolic murmur that increases on inspiration. JVP shows prominent v waves. What is the most likely mechanism of tricuspid regurgitation?
A
Primary rheumatic involvement of tricuspid valve
B
Papillary muscle ischemia
C
Functional regurgitation due to right ventricular dilation
D
Congenital leaflet malformation