TY - JOUR
T1 - Impact of revascularization and myocardial viability determined by nitrate-enhanced Tc-99m sestamibi and Tl-201 imaging on mortality and functional outcome in ischemic cardiomyopathy
AU - Senior, Roxy
AU - Kaul, Sanjiv
AU - Raval, Usha
AU - Lahiri, Avijit
N1 - Funding Information:
From the Department of Cardiovascular Medicine, Northwick Park Hospital and Institute of Medical Research, Harrow, United King-dom,a and Division of Cardiology, University of Virginia, Char-lottesville, Va.b Supported by study grants from DuPont Pharmaceuticals, NPH Cardiac Research Fund, and Mr Michael Tabor Research Fund. Received for publication May 29, 2001; final revision accepted Feb 13, 2002. Reprint requests: Roxy Senior, MD, DM, FRCP (Lond), FESC, Department of Cardiac Research, Department of Cardiology, North-wick Park Hospital, Watford Road, Harrow, Middlesex HA1 3UJ, United Kingdom; nphcardiology@netscapeonline.co.uk. Copyright © 2002 by the American Society of Nuclear Cardiology. 1071-3581/2002/$35.00 + 0 43/1/123913 doi:10.1067/mnc.2002.123913
PY - 2002
Y1 - 2002
N2 - Background. Nitrate-enhanced perfusion imaging has been shown to detect viability in dysfunctional myocardium, but nitrate-enhanced technetium 99m sestamibi has not been compared with nitrate-enhanced thallium 201. Methods and Results. Fifty-six patients with ischemic cardiomyopathy and heart failure (New York Heart Association classes II-IV) were scheduled for revascularization. Through use of a matching 12-segment model, nitrate-enhanced Tl-201 and Tc-99m sestamibi uptake at rest was assessed by 2 sets of blinded investigators. All single photon emission computed tomography data sets were read separately. Additional exercise Tc-99m sestamibi single photon emission computed tomography was performed on a separate day. Myocardial viability was thought to be present when the tracer uptake score was less than 3 (normal, 0; absent, 4). Of the 56 patients scheduled to undergo revascularization, only 23 (41 %) underwent the procedure and the remainder continued medical therapy. Functional assessment by rest echocardiography was performed at 21 ± 8 months, and survival was determined at 40 ± 18 months. The baseline clinical and hemodynamic parameters were similar in the revascularization (n = 23) and medical therapy (n = 33) groups. Perfusion scores with nitrate-enhanced Tl-201 and Tc-99m sestamibi were similar in dysfunctional segments. Stress Tc-99m sestamibi reversible defects predicted significant improvement in left ventricular function compared with those without defects (P < .01) after revascularization. Cox regression model showed that when at least 5 reversible segments were viable, revascularization produced greater improvements in New York Heart Association class, a better trend toward survival (P = .07 for Tl-201 and P = .06 for Tc-99m), and a significantly greater impact on reverse remodeling. Conclusions. Myocardial viability determined by nitrate-enhanced Tl-201 and myocardial viability determined by Tc-99m sestamibi are equivalent for predicting functional improvements, remodeling, and survival after revascularization in patients with ischemic cardiomyopathy.
AB - Background. Nitrate-enhanced perfusion imaging has been shown to detect viability in dysfunctional myocardium, but nitrate-enhanced technetium 99m sestamibi has not been compared with nitrate-enhanced thallium 201. Methods and Results. Fifty-six patients with ischemic cardiomyopathy and heart failure (New York Heart Association classes II-IV) were scheduled for revascularization. Through use of a matching 12-segment model, nitrate-enhanced Tl-201 and Tc-99m sestamibi uptake at rest was assessed by 2 sets of blinded investigators. All single photon emission computed tomography data sets were read separately. Additional exercise Tc-99m sestamibi single photon emission computed tomography was performed on a separate day. Myocardial viability was thought to be present when the tracer uptake score was less than 3 (normal, 0; absent, 4). Of the 56 patients scheduled to undergo revascularization, only 23 (41 %) underwent the procedure and the remainder continued medical therapy. Functional assessment by rest echocardiography was performed at 21 ± 8 months, and survival was determined at 40 ± 18 months. The baseline clinical and hemodynamic parameters were similar in the revascularization (n = 23) and medical therapy (n = 33) groups. Perfusion scores with nitrate-enhanced Tl-201 and Tc-99m sestamibi were similar in dysfunctional segments. Stress Tc-99m sestamibi reversible defects predicted significant improvement in left ventricular function compared with those without defects (P < .01) after revascularization. Cox regression model showed that when at least 5 reversible segments were viable, revascularization produced greater improvements in New York Heart Association class, a better trend toward survival (P = .07 for Tl-201 and P = .06 for Tc-99m), and a significantly greater impact on reverse remodeling. Conclusions. Myocardial viability determined by nitrate-enhanced Tl-201 and myocardial viability determined by Tc-99m sestamibi are equivalent for predicting functional improvements, remodeling, and survival after revascularization in patients with ischemic cardiomyopathy.
KW - Ischemic cardiomyopathy
KW - Myocardial viability
KW - Revascularization
KW - Tc-99m sestamibi
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U2 - 10.1067/mnc.2002.123913
DO - 10.1067/mnc.2002.123913
M3 - Article
C2 - 12360125
AN - SCOPUS:0036765577
SN - 1071-3581
VL - 9
SP - 454
EP - 462
JO - Journal of Nuclear Cardiology
JF - Journal of Nuclear Cardiology
IS - 5
ER -