T wave normalization during dobutamine stress testing in patients with non-Q wave myocardial infarction. A marker of myocardial ischaemia?

36 patients with previous non-Q wave myocardial infarction, normal QRS, negative T waves in two or more ECG leads, and no significant ST segment depression or elevation at rest or during stress, selected from 520 patients undergoing dobutamine stress testing for suspected myocardial ischaemia.

T wave normalization (defined as a resting negative T wave becoming upright in one or more ECG leads) during dobutamine stress testing

Persistent T wave inversion (T waves remained negative) during dobutamine stress testing

Myocardial ischaemia defined by reversible perfusion defects on scintigraphy and stress-induced wall motion abnormalities on echocardiographysurrogate