Objective To evaluate the immediate results and the 6 month angiographic restenosis rate after repeat percutaneous intervention for in stent restenosis (ISR) Methods The acute and 6 month follow up outcomes of 156 patients with ISR who were treated by repeat PTCA or stenting were analyzed in this retrospective study Quantitative coronary angiography analyses (QCA) were performed before and after repeat intervention for in stent restenosis and on a average 6 month coronary angiogram to assess the recurrent restenosis rate Results All the patients were treated successfully Balloon angioplasty was performed in 134 patients (85 9%) and repeat stenting in 22 patients (14 1%) The six month follow up coronary angiogram showed the recurrent restenosis rate was 24 3% The recurrent restenosis rate was higher in 40 diffuse ISR lesions than that in 96 focal ISR lesions: 45% vs 18%, P75% was also the risk factor of recurrent restenosis Conclusion For the most patients with ISR, repeat PTCA or intracoronary stenting seems to be an effective and safe method The overall restenosis rate after repeat intervention for ISR is the same as that of initial intracoronary stenting