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INTRODUCTIONrnIn patients with coronary artery disease (CAD),the most important factors regarding to both symptoms and outcomes are the presence and extent of inducible ischemia.[1] Alleviation of ischemia with percutaneous coronary intervention (PCI) can improve symptoms and clinical outcomes.Stenting ischemic stenosis result in effective and durable relief of angina pectoris and improves outcome,while in opposite,stenting nonischemic stenosis deteriorates outcomes and is not cost-effective.