Correlative factors with positive submaximal ECG stress test (residual myocardial ischemia) (P < 0.05) include: age > 60, female, conservative medical or fibrinolytic treatment, maximal heart rate at effort < 120 bpm, poor effort ability < 5 METS, heart rate decrease at 1st minute post effort ≤ 12 bpm, prolonged recovery time post effort (≥ 6 minutes), heart failure syndrome at effort, new arrhythmias or conductive disturbances at effort.