Role of echocardiography in acute myocardial infarction
- Neil J Weissman, MD
Neil J Weissman, MD
- Professor of Medicine
- Georgetown University School of Medicine
- Bryan Ristow, MD, FACC, FASE, FACP
Bryan Ristow, MD, FACC, FASE, FACP
- Associate Clinical Professor of Medicine
- University of California, San Francisco
- Nelson B Schiller, MD, FACC, FRCP, FASE
Nelson B Schiller, MD, FACC, FRCP, FASE
- Section Editor — Noninvasive Cardiac Imaging and Stress Testing
- Professor of Medicine and Anesthesia
- University of California, San Francisco
The echocardiogram is a standard tool in the management of patients with acute myocardial infarction (MI). The role of echocardiography in establishing the diagnosis, location, and extent of MI, in diagnosing mechanical complications of infarction, and in providing prognostic information that is important for risk stratification will be reviewed. The use of transthoracic echocardiography for the evaluation of chest pain in the emergency department is discussed separately. (See "Transthoracic echocardiography for the evaluation of chest pain in the emergency department".)
DIAGNOSIS OF MI
The diagnosis of an acute myocardial infarction (MI) is typically based upon the history, electrocardiogram, and cardiac enzymes, particularly serum troponins and creatine kinase MB fraction (CK-MB). (See "Criteria for the diagnosis of acute myocardial infarction".) Although not routinely performed for diagnosis, echocardiography is an accurate, noninvasive test that is able to detect evidence of myocardial ischemia or necrosis.
A 2003 task force update of the 1997 American College of Cardiology, the American Heart Association, and the American Society of Echocardiography (ACC/AHA/ASE) guidelines for echocardiography recommended the use of echocardiography in the diagnosis of suspected acute ischemia or infarction not evident by standard means, but did not recommend echocardiography when the diagnosis was already apparent . Similarly, the 2011 appropriate use criteria for echocardiography classified use of echocardiography in the diagnosis of suspected MI as appropriate .
Evaluation of wall motion while a patient is experiencing chest pain can be useful when the electrocardiogram is nondiagnostic . Evaluation of wall motion may also be useful if there is electrocardiographic or laboratory evidence of MI even in the absence of chest pain . (See "Noninvasive testing and imaging for diagnosis in patients at low to intermediate risk for acute coronary syndrome", section on 'Rest imaging'.)
Severe ischemia produces regional wall motion abnormalities (RWMAs) that can be visualized echocardiographically within seconds of coronary artery occlusion (12±5 and 19±8 seconds in two series of patients evaluated during transient coronary occlusions induced by angioplasty) [3,4]. These changes occur prior to the onset of electrocardiographic changes or the development of symptoms (figure 1) . The RWMAs reflect a localized decrease in the amplitude and rate of myocardial excursion, as well as a blunted degree of myocardial thickening and local remodeling.
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- DIAGNOSIS OF MI
- LOCATION AND EXTENT OF MI
- - Anteroapical
- - Inferobasal
- - Lateral or free wall
- - Right ventricle
- - Multiple segment
- - Apical ballooning syndrome (takotsubo cardiomyopathy)
- Extent of infarct
- DETECTING COMPLICATIONS AFTER MI
- Mechanical complications
- - VSD
- - Papillary muscle rupture
- - Papillary muscle displacement
- Free wall rupture
- Tricuspid regurgitation
- LV thrombus
- Silent complications
- USE FOR PROGNOSIS
- Left ventricular systolic function
- Left ventricular diastolic function
- Mitral regurgitation
- Residual ischemia
- Other factors