(Circulation. 1999;100:141-148.)
© 1999 American Heart Association, Inc.
Clinical Investigation and Reports |
Prognostic Value of Myocardial Ischemia and Viability in Patients With Chronic Left Ventricular Ischemic Dysfunction
From the Divisions of Cardiology and Nuclear Medicine, University of Louvain Medical School, Brussels, Belgium.
Correspondence to Jean-Louis J. Vanoverschelde, MD, PhD, Division of Cardiology, Cliniques Universitaires St Luc, Avenue Hippocrate, 10-2881, B-1200, Brussels, Belgium. E-mail Vanoverschelde{at}card.ucl.ac.be
Background—Previous studies showed that thallium scintigraphy and dobutamine echocardiography were accurate, noninvasive ways of predicting contractile recovery after revascularization in patients with left ventricular (LV) dysfunction. However, the prognostic impact of such methods remains uncertain.
Methods and Results—We prospectively studied 137 consecutive patients with coronary disease and LV dysfunction who underwent exercise-redistribution-reinjection thallium scintigraphy and dobutamine echocardiography to identify myocardial ischemia and viability. A total of 94 patients subsequently underwent revascularization, and 43 underwent medical treatment. The primary endpoint was cardiac mortality, and mean follow-up was 33±10 months. Twenty-four patients died of cardiac causes. By Cox's regression analysis, long-term survival was related to the extent of coronary disease, the presence of diabetes, type of treatment, the presence of ischemic myocardium as determined by thallium scintigraphy, and the presence of viable myocardium as determined by both tests. Three-year survival was greater in patients with ischemic myocardium (as determined by thallium scintigraphy) or viable myocardium (as determined by both tests) who underwent revascularization than in the other groups (P=0.018 with thallium; P<0.001 with dobutamine). Subgroup analyses indicated that among patients with 1- or 2-vessel disease, only those with ischemic or viable myocardium improved survival after revascularization, whereas in patients with 3-vessel or left main diseases, revascularization always improved survival, albeit more in the presence of ischemic or viable myocardium.
Conclusions—Among the parameters commonly available in patients with LV ischemic dysfunction, the presence of ischemic myocardium (as determined by thallium scintigraphy) and that of viable myocardium (as determined by dobutamine echocardiography) are independent predictors of subsequent mortality. These observations may be useful in the preoperative selection of patients for revascularization.
Key Words: myocardial stunning • coronary artery bypass • angioplasty • myocardial infarction
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