Background: Coronary stents have been the major advance in percutaneous coronary intervention in the last decade and are used in patients. The aim of this study was to evaluate the incidence of clinical instent restenosis on the basis of exercise test in patients with coronary disease.

Materials and Methods: The cross-sectional strategy of this study was carried out on 345 patients who underwent percutaneous coronary intervention. In this study six months after stent implantation, clinical evaluation was performed by noninvasive study in patients.

Results: Of 345 patients, 26 patients were excluded for various causes. There was instent restenonis in 20.7% of patients. In those who had abnormal exercise test, stent had been implanted in left anterior descending artery more than other coronary arteries and they had also shown unstable angina pectoris and myocardial infarction before stent implantation.

Conclusion: The incidence of restenosis in patients with acute coronary syndrome was more than choronic stable angina pectoris.