This is an application for competitive renewal of our project entitled """"""""Contrast MRI and Chronic Myocardial Injury in Humans"""""""", which yielded many of the original papers in delayed-enhancement"""""""" MRI (DE-MRI), a technique that is now considered a fundamental component of the Cardiac MRI examination and used world-wide to evaluate patients with heart disease. Despite the successes, there remain crucial limitations in the evidence base and in the technique itself. First, very few prognostic studies have been performed, and as such, there is a paucity of evidence linking DE-MRI findings with patient outcome. Yet, prognostic studies are the bedrock of evidence-based clinical medicine and these will be vital in determining the exact role of DE-MRI in assisting patient management decisions. Second, DE-MRI exhibits excellent contrast between infarcted and normal myocardium;however, the contrast between infarcted myocardium and the blood pool (both of which are bright) is frequently suboptimal. Since a large proportion of infarctions caused by coronary heart disease are subendocardial, it is often difficult to detect small infarcts or, even if detected, to assess the precise size of the infarct. Given these limitations, we have identified two important """"""""next steps"""""""" that we will tackle as part of our continuing project. First, we will aim to establish the prognostic implications of the DE-MRI findings. We propose to study patients with left ventricular dysfunction due to cardiomyopathy, a group at increased risk for sudden death (Aim 1). We hypothesize that an assessment of myocardial scarring by DE-MRI will provide additional prognostic information compared with a traditional assessment, including left ventricular ejection fraction. Second, we have developed a novel """"""""dark-blood"""""""" DE-MRI technique (FIDDLE), which improves the detection of subendocardial infarcts. Our goal will be to optimize this technique in an animal model of myocardial infarction (MI), and then to compare this technique with conventional DE-MRI in a study of patients with documented non-Q-wave MI, which are often small and subendocardial (Aims 2 and 3). We hypothesize that FIDDLE will improve sensitivity for detecting MI, without reducing specificity. Given the worldwide epidemic of cardiovascular disease (30% of global deaths), a noninvasive technique that could improve the detection, risk stratification, and management of patients with heart disease would represent a significant advance. Accordingly, we believe that the results of this project could have a large clinical impact.
Delayed-enhancement"""""""" MRI (DE-MRI), a technique that is now considered a fundamental component of the Cardiac MRI examination, is used world-wide to evaluate patients with heart disease. Despite the successes, there remain crucial limitations in the evidence base and in the technique itself. This project aims to establish the prognostic implications of the DE-MRI findings and proposes a new technique to improve the detection of subendocardial infarcts. Given the worldwide epidemic of cardiovascular disease (30% of global deaths), a noninvasive technique that could improve the detection, risk stratification, and management of patients with heart disease would represent a significant advance. Accordingly, we believe that the results of this project could have a large clinical impact.
|Smulders, Martijn W; Bekkers, Sebastiaan C A M; Kim, Han W et al. (2015) Performance of CMR Methods for Differentiating Acute From Chronic MI. JACC Cardiovasc Imaging 8:669-79|
|Kim, Han W; Van Assche, Lowie; Jennings, Robert B et al. (2015) Relationship of T2-Weighted MRI Myocardial Hyperintensity and the Ischemic Area-At-Risk. Circ Res 117:254-65|
|White, James A; Kim, Han W; Shah, Dipan et al. (2014) CMR imaging with rapid visual T1 assessment predicts mortality in patients suspected of cardiac amyloidosis. JACC Cardiovasc Imaging 7:143-56|
|Jenista, Elizabeth R; Rehwald, Wolfgang G; Chen, Enn-Ling et al. (2013) Motion and flow insensitive adiabatic T2 -preparation module for cardiac MR imaging at 3 Tesla. Magn Reson Med 70:1360-8|
|Shah, Dipan J; Kim, Han W; James, Olga et al. (2013) Prevalence of regional myocardial thinning and relationship with myocardial scarring in patients with coronary artery disease. JAMA 309:909-18|
|Klem, Igor; Weinsaft, Jonathan W; Bahnson, Tristram D et al. (2012) Assessment of myocardial scarring improves risk stratification in patients evaluated for cardiac defibrillator implantation. J Am Coll Cardiol 60:408-20|
|Klem, Igor; Shah, Dipan J; White, Richard D et al. (2011) Prognostic value of routine cardiac magnetic resonance assessment of left ventricular ejection fraction and myocardial damage: an international, multicenter study. Circ Cardiovasc Imaging 4:610-9|
|Weinsaft, Jonathan W; Kim, Han W; Crowley, Anna Lisa et al. (2011) LV thrombus detection by routine echocardiography: insights into performance characteristics using delayed enhancement CMR. JACC Cardiovasc Imaging 4:702-12|
|Patel, Manesh R; Cawley, Peter J; Heitner, John F et al. (2009) Detection of myocardial damage in patients with sarcoidosis. Circulation 120:1969-77|
|Kim, Han W; Klem, Igor; Shah, Dipan J et al. (2009) Unrecognized non-Q-wave myocardial infarction: prevalence and prognostic significance in patients with suspected coronary disease. PLoS Med 6:e1000057|
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