Catastrophic complications of myocardial infarction include which of the following?

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The situation tests catastrophic mechanical complications after a myocardial infarction, specifically a rupture that abruptly compromises valve function. Papillary muscle rupture after an MI causes sudden, severe mitral regurgitation, leading to rapid hemodynamic collapse with pulmonary edema and shock. This is a hallmark of a life-threatening mechanical complication that can occur days after an infarct when weakened tissue gives way, making urgent diagnosis and intervention critical. Left ventricular aneurysm tends to be a late complication that causes chronic heart failure or arrhythmias rather than an abrupt, severe collapse. Atrial fibrillation is common post-MI but usually does not produce the immediate catastrophic hemodynamics seen with papillary muscle rupture. Pulmonary embolism, while dangerous, is not a direct, classic mechanical consequence of an MI.