Clinical presentation and echocardiographic diagnosis of postinfarction papillary muscle rupture: A review of 22 cases.

Abstract

Acute myocardial infarctions (AMI) continue to be common in the United States. Mechanical complications of AMI can lead to cardiogenic shock (CS) and death. The aim of this study was to review the cases of papillary muscle ruptures in the setting of myocardial infarctions at a tertiary care center, with a focus on the clinical presentation and echocardiographic diagnosis. This was a retrospective study from January 1, 2000 through December 31, 2014. In all, 22 patients with AMI and papillary muscle rupture (AMI-PMR) who had surgical intervention were identified. The average age was 70 (±11) with 16 (73%) males. Six patients presented with ST-elevation myocardial infarctions (STEMI) and all underwent emergent revascularization with primary percutaneous coronary intervention (PCI) prior to the diagnosis of AMI-PMR. The other 16 patients presented with a non-STEMI. In total, 17 (77%) of the 22 patients were diagnosed with an AMI-PMR within 7days from their onset of symptoms. In all, 12 patients (55%) had anterolateral papillary muscle ruptures (ALPMR), and the other 10 had posteromedial papillary muscle ruptures (PMPMR). Ruptures were complete in 10 patients (45%). Patients presented with pulmonary edema early (<7days) more commonly than late (>14days). Transthoracic echocardiography was able to demonstrate severe mitral regurgitation in 86% and a definitive or suggestive diagnosis in 93%. All 22 patients survived to operative management, and the overall in-hospital mortality rate was 9%. In conclusion, ischemic papillary muscle ruptures continue to occur, but with prompt diagnosis by echocardiography and rapid surgical management, the mortality rate continues to decline.