28 Comparison of results of SPECT myocardial perfusion imaging before and after PCI (n=85)% NormalSPECT af ter PCI No defect in SPECT image before and after PCI 2 2, 4 Defect in SPECT image before but no longer in SPECT image after PCI 14 16, 5 Abnormal SPECTafte r PCI Persistent defect Defect in SPECT image before but significantly reduced extension, severity in SPECT image after PCI 22 25, 9 Defect in SPECT image before and unsignificantly changed in SPECT images after PCI 14 16, 5 Defect in SPECT image before but significantly increased extension, severity in SPECT image after PCI 13 15, 3 Defect involved one coronary branchesignificantly reduced extension, severity while Defect involved others increased.