Circulation. 2002;106:1083-1089
Published online before print August 12, 2002, doi: 10.1161/01.CIR.0000027818.15792.1E
Published online before print August 12, 2002, doi: 10.1161/01.CIR.0000027818.15792.1E
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(Circulation. 2002;106:1083.)
© 2002 American Heart Association, Inc.
Clinical Investigation and Reports |
Accuracy of Contrast-Enhanced Magnetic Resonance Imaging in Predicting Improvement of Regional Myocardial Function in Patients After Acute Myocardial Infarction
From the Cardiology Division (B.L.G., J.G., K.C.W., J.A.C.L.), Department of Medicine, and the Division of MRI (D.A.B., J.A.C.L.), Department of Radiology, Johns Hopkins Hospital, Baltimore, Md.
Correspondence to João A.C. Lima, MD, Cardiology Division, Blalock 569, Johns Hopkins Hospital, 600 N Wolfe St, Baltimore, MD 21287-6568. E-mail jlima{at}jhmi.edu
Background— Contrast-enhanced (CE) MRI demonstrates a pattern of hypoenhancement early after contrast injection in acute myocardial infarction (MI) and a pattern of hyperenhancement late after contrast injection. Because the significance of these CE patterns for myocardial viability remains debated, we evaluated their diagnostic accuracy to quantitatively predict late functional improvement of regional contractility.
Methods and Results— Twenty patients underwent CE and tagged MRI at 4 days and again at 7 months after acute MI. Resting circumferential shortening strain (Ecc) was analyzed in 24 segments per patient, and its improvement was correlated with the presence or absence of the CE patterns. Immediately after MI, 389 segments were considered dysfunctional because of having less than mean±2 SD Ecc of the remote region (-18±4%). At follow-up, significant improvement of Ecc occurred in 170 dysfunctional segments with normal CE (from -4±7% to -12±7%, P<0.001) but not in 60 segments with early hypoenhancement (from -2±6% to -6±9% Ecc, P=NS). In 240 dysfunctional segments with delayed hyperenhancement, the improvement of Ecc (from -2±6% to -5±8%, P<0.001) decreased with increasing transmural extent of hyperenhancement. Receiver operating characteristic analysis demonstrated that absence of delayed hyperenhancement, compared with absence of early hypoenhancement, had better sensitivity (82% versus 19%, respectively; P<0.001) and accuracy (74% versus 49%, respectively; P<0.001) in predicting recovery of Ecc to any given level.
Conclusions— Compared with lack of early hypoenhancement, lack of delayed hyperenhancement has better diagnostic accuracy in predicting functional improvement in dysfunctional segments. The early hypoenhanced regions, which represent only the fraction of infarcted tissue with concomitant microvascular obstruction, greatly underestimate the amount of irreversibly injured myocardium present after acute MI.
Key Words: magnetic resonance imaging • myocardial infarction • hibernation • myocardial stunning
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