Objective Evaluation the effects on instantly branch occlusion rate of stenting the main branch after the pre-dilated coronary artery with a diameter ≤ 2.0mmostial lesion, with remedial branch opening expansion after branch completely or nearly completely occluded.

Methods 68 cases of hospitalised patients undergoing percutaneous coronary intervention (PCI) were admitted in the Second Hospital of Shanxi Medical University from June 2006 to June 2012, including 53 cases of male, female 15 cases. 30 cases of patients decided whether balloon dilation after stenting of the main branch stenosisaccording to the branch opening stenosis (group P), 70% of the patients completed in the period from June 2006 to August 2009; 38 cases of patients were pre-expansion of branch openings prior to the stenting of the main branch (the balloon diameter 1.25 ∼ 2.0mm) (group S), 84.2% of the patients completed in September 2009.

Results Branch of 9 patients (30%) occured complete or near-complete occlusion in group P, After the branch opening expansion, and the guidewire of 4 patients could not through the occlusion opening, accounting for 13.3%; Branch of 5 patients (13.3%) occured complete or near-complete occlusion in group S, and the guidewire of 2 patients could not through the occlusion opening, accounting for 5.3%; The difference was statistically significant.

Conclusions Stenting the main branch after the small balloon pre-dilated ostial lesion of coronary artery with a diameter ≤ 2.0mmcan reduce the rate of branch occlusion.