- Non-invasive evidence of ischemia referable to a hemodynamically significant left main lesion (large area of ischemia in both the LAD and LCX territories, or in either the LAD or LCX territory in the absence of other obstructive coronary artery disease to explain the LAD or LCX defect), or stress-induced hypotension or stress-induced fall in LVEF, or stress-induced transient ischemic dilatation of the left ventricle or stress-induced thallium/technetiumlung uptake, and/or