doi: 10.1161/CIRCULATIONAHA.105.521450
(Circulation. 2006;113:394-404.)
© 2006 American Heart Association, Inc.
Imaging |
Contrast-Enhanced Multidetector Computed Tomography Viability Imaging After Myocardial Infarction
Characterization of Myocyte Death, Microvascular Obstruction, and Chronic Scar
From the Department of Medicine, Division of Cardiology (A.C.L., M.A.S.C., C.S., L.C.A., R.T.G., A.P.S., K.H.S., V.R.F., M.Z., S.N., H.R.H., K.C.W., J.M.H., J.A.C.L.), Department of Biomedical Engineering (A.C.L., H.R.H., J.M.H.), Department of Surgery (A.C.L.), Department of Radiology (A.C.L., H.R.H., J.A.C.L.), and Institute of Cellular Engineering (J.M.H., L.C.A., A.P.S., K.H.S.), Johns Hopkins University School of Medicine, Baltimore, Md.
Correspondence to Albert C. Lardo, PhD, FAHA, Johns Hopkins School of Medicine, Division of Cardiology, 720 Rutland Ave, 1042 Ross Bldg, Baltimore, MD 21205. E-mail al{at}jhmi.edu
Received February 18, 2005; revision received October 25, 2005; accepted October 26, 2005.
Background— The ability to distinguish dysfunctional but viable myocardium from nonviable tissue has important prognostic implications after myocardial infarction. The purpose of this study was to validate the accuracy of contrast-enhanced multidetector computed tomography (MDCT) for quantifying myocardial necrosis, microvascular obstruction, and chronic scar after occlusion/reperfusion myocardial infarction.
Methods and Results— Ten dogs and 7 pigs underwent balloon occlusion of the left anterior descending coronary artery (LAD) followed by reperfusion. Contrast-enhanced (Visipaque, 150 mL, 325 mg/mL) MDCT (0.5 mm x 32 slice) was performed before occlusion and 90 minutes (canine) or 8 weeks (porcine) after reperfusion. MDCT images were analyzed to define infarct size/extent and microvascular obstruction and compared with postmortem myocardial staining (triphenyltetrazolium chloride) and microsphere blood flow measurements. Acute and chronic infarcts by MDCT were characterized by hyperenhancement, whereas regions of microvascular obstruction were characterized by hypoenhancement. MDCT infarct volume compared well with triphenyltetrazolium chloride staining (acute infarcts 21.1±7.2% versus 20.4±7.4%, mean difference 0.7%; chronic infarcts 4.15±1.93% versus 4.92±2.06%, mean difference –0.76%) and accurately reflected morphology and the transmural extent of injury in all animals. Peak hyperenhancement of infarcted regions occurred 
5 minutes after contrast injection. MDCT-derived regions of microvascular obstruction were also identified accurately in acute studies and correlated with reduced flow regions as measured by microsphere blood flow.
Conclusions— The spatial extent of acute and healed myocardial infarction can be determined and quantified accurately with contrast-enhanced MDCT. This feature, combined with existing high-resolution MDCT coronary angiography, may have important implications for the comprehensive assessment of cardiovascular disease.
CLINICAL PERSPECTIVE
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