Abstract: Objective  To compare the clinical efficacy and safety of treatment of trigeminal lesions after right coronary artery with single stent by different methods. Methods  Patients with coronary heart disease who underwent coronary angiography showing a right tricuspid trigeminal true bifurcation lesion and a singlebranch coronary artery lesion were selected.According to the steps of interventional surgery, the patients were divided into the balloon kissingdilation group (group A) and the nonballoon kissingdilation group (group B). Group A was further divided into two groups: group A1 and group A2. The incidence of interventional complications, Xray exposure time, the dosage of contrast medium, major adverse cardiac events and stent restenosis were observed 1 year after surgery. Results  Compared with group A1, the incidence of intraoperative complications such as slow blood flow, angina pectoris and coronary artery blood flow not reaching TIMI3 in angiography one year later in group A2 was lower (P<0.05). Compared with group B, group A had lower incidence of intraoperative complications such as slow blood flow, angina pectoris and coronary artery blood flow not reaching TIMI3 in angiography one year later(P<0.05). There was no significant difference in Xray exposure time and the dosage of contrast medium. Conclusion  In the treatment of right tricuspid trigeminal true bifurcation lesion with a singlebranch coronary artery lesion, the incidence of major clinical adverse cardiac events in one year after balloon dilatation was lower than that without balloon dilatation, and the incidence of complications and major adverse cardiac events in one year after poststent dilatation was lower than that in the prestent  balloon dilatation.

Key words: coronary heart disease, posterior trigeminal, interventional therapy, single stent