CTICasesTraumatic Papillary Muscle Rupture
[...]. Traumatic Papillary Muscle Rupture. CTICases. Published June 22, 2017. https://str-case-explorer.pages.dev/c/f6gtz
Imaging findings
Cardiac MRI shows a flail posteromedial papillary muscle and chordae tendineae moving freely between the left ventricle and left atrium during the cardiac cycle, accompanied by a severe, eccentric, posteriorly directed mitral regurgitation jet.
Key takeaways
Rupture of a papillary muscle or chordae tendineae is an uncommon, acute complication of blunt chest trauma. The injury typically occurs when a sudden, high-impact force hits the chest wall during late diastole or early systole, raising intraventricular pressure while the mitral valve is closed, which causes the subvalvular apparatus to fail as a "pop-off" mechanism.
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