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(Circulation. 1996;94:2712-2719.)
© 1996 American Heart Association, Inc.


Articles

Assessment of Myocardial Viability in Patients With Chronic Coronary Artery Disease

Rest–4-Hour–24-Hour 201Tl Tomography Versus Dobutamine Echocardiography

Pasquale Perrone-Filardi, MD, PhD; Leonardo Pace, MD; Mariella Prastaro, MD; Fiorenzo Squame, MD; Sandro Betocchi, MD; Andrea Soricelli, MD; Federico Piscione, MD; Ciro Indolfi, MD; Teresa Crisci, MD; Marco Salvatore, MD; Massimo Chiariello, MD

the Divisions of Cardiology (P.P.-F., M.P., S.B., F.P., C.I., T.C., M.C.) and Nuclear Medicine (L.P., F.S., A.S., M.S.), "Federico II" University Medical School, Naples, Italy.

Correspondence to Pasquale Perrone-Filardi, MD, PhD, Cattedra di Cardiologia, Universita degli Studi "Federico II," Via S Pansini 5, I-80131 Napoli, Italy.

Background To date, late redistribution after resting 201Tl injection has not been evaluated. In addition, the concordance between resting 201Tl imaging and dobutamine echocardiography in identifying viable myocardium has not been assessed.

Methods and Results Forty patients with coronary artery disease underwent rest–4-hour–24-hour 201Tl tomography and dobutamine echocardiography (5 to 10 µg·kg-1·min-1). Late redistribution occurred in 46 (21%) of 219 persistent defects at 4 hours. Systolic function and contractile reserve were similar among persistent defects at 4 hours with and without late redistribution. Contractile reserve was more frequent in segments with normal 201Tl uptake (59%), completely reversible defects (53%), or mild to moderate defects at 4 hours (56%) compared with severe defects (14%; P<.02 versus all). Of 105 hypokinetic segments, 99 (94%) were viable by 201Tl, and 88 (84%) showed contractile reserve. In contrast, of 155 akinetic segments, 119 (77%) were viable by 201Tl, but only 34 (22%) had contractile reserve. Concordance between 201Tl and dobutamine was 82% in hypokinetic segments but 43% in akinetic segments. In 109 revascularized segments, positive accuracy for functional recovery was 72% for 201Tl and 92% for dobutamine, whereas negative accuracy was 100% and 65%, respectively. Sensitivity was 100% for 201Tl and 79% for dobutamine.

Conclusions Late redistribution occurs in one fifth of persistent defects at 4 hours, and it does not correlate to systolic function or contractile reserve. Dobutamine and 201Tl yield concordant information in the majority of hypokinetic segments, whereas concordance is low in akinetic segments. Dobutamine demonstrates higher positive accuracy and sensitivity in predicting recovery of dysfunctional myocardium, whereas 201Tl shows higher negative predictive accuracy but reduced positive accuracy.


Key Words: scintigraphy • echocardiography • myocardium • coronary disease




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