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Enhanced external counterpulsation (EECP) is a noninvasive treatment for chronic stable angina,which works by recruiting and developing the coronary collateral vessels.Coronary perfusion and coronary flow reserve (CFR) were evaluated by nitrogen-13 (13N) ammonia positron emission tomography (PET) in a patient who had undergone EECP.The patient,who had 3-vessel coronary artery disease,required a percutaneous transluminal coronary angioplasty (PTCA) for the right coronary artery.The PTCA was successful,but 6 months later he again felt chest oppression.