A 64-year-old man presents with sudden severe breathlessness and hypotension 4 days after an inferior wall myocardial infarction. Echocardiography shows severe mitral regurgitation with a flail posterior leaflet and a normal-sized left atrium. What is the most likely cause?
A
Chordae tendineae elongation
B
Papillary muscle rupture
C
Left ventricular dilatation
D
Rheumatic valve disease