Spontaneous Papillary Muscle Rupture: An Uncommon Presentation in the Absence of Myocardial Infarction.

ABSTRACT

BACKGROUND Papillary muscle rupture (PMR) is a rare complication of myocardial infarction (MI); experiencing PMR without MI makes it even more uncommon, thereby complicating its diagnosis. Therefore, we report a case of spontaneous PMR to raise awareness of this entity. CASE REPORT A 48-year-old man with type 2 diabetes presented to the Emergency Department (ED) after experiencing sudden shortness of breath that began the day before. He had no history of chest trauma, fever, chills, or ischemic chest pain. His vital signs showed stable blood pressure and mild tachycardia. The patient had hypoxemia that did not respond to use of a non-rebreather mask (oxygen saturation 70%). Upon examination, he had increased respiratory rate, altered sensorium, no lower-limb edema, and his chest auscultation revealed bilateral crackles. Chest radiography showed pulmonary edema. Two electrocardiograms (ECG) showed no signs of ST elevation myocardial infarction (STEMI) or RV strain. The patient was intubated but remained hypoxic despite maximum ventilation settings. Transthoracic echocardiography (TTE) performed immediately thereafter revealed acute severe mitral regurgitation with evidence of PMR. A multidisciplinary team approach was adopted early in this case, which resulted in a positive outcome. Eventually, mitral valve replacement was performed, and the patient was discharged home after 17 days, with a favorable neurological outcome. CONCLUSIONS We report a very rare case of spontaneous PMR in a middle-aged man with no evidence of MI, infective endocarditis, or preceding chest trauma. It shows the importance of adopting an early multidisciplinary team approach and showcases the abilities of emergency medicine physicians in early recognition.