Myocardial viability in patients with coronary artery disease and heart failure was assessed by echocardiography with low doses of dobutamine and positron emission tomography with Sodium 11C-butyrate. Sensitivity and specificity of those methods were compared. Positron emission tomography and Sodium 11C-butyrate had quite high sensitivity and specificity, which could be compared with positron emission tomography and fluorine-18-deoxyglucose. Echocardiography with low doses of dobutamine had high specificity and its sensitivity was lower that one of positron emission tomography and Sodium 11C-butyrate. Thus, it is necessary to use the protocol of stress dobutamine echocardiography with high doses to avoid this problem.
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