Intracoronary Stent Implantation: Six Months Results, Predictors of Stent Restenosis

Coronary artery stents are known to reduce the rate of restenosis after coronary angioplasty and various types of stents have been used widely in the treatment of coronary artery disease. In this study we evaluated six months elinical and angiographic follow up results of a patient group in whom various types of stents were implanted in all indications in the Institute of Cardiology, University of Istanbul. Angiographic restenosis rate and predictors of stent restenosis were investigated in 180 consecutive patients. 199 stents were implanted in 190 lesi on s of 180 patients. Types of stents were as follows: 61 Multilink stents, 66 Microstents, 17 Palmaz-Schatz stents, 38 Wiktor stents, ll Cordis stents, 4 NIR stents and 2 Wallstents. Primary success rate was 97,7%. One patient had Q and anather one had non-Q wave myocardia1 infarction, and three other patients underwent emergency bypass surgery. Acute, subacute stent thrombosis and death did not occur. Patients were clinically and angiographically followed up at their sixth month of stent implantation. One hundred and fifty seven patients (89%) had coronary angiography at six month after stent implantation. Stent restenesis was documented in 47 patients and restenesis rates per patient and per stent were calculated as 29,9% and 27,9%, respectively. Two patients had non-Q wave myocardial infarction, 25 patients required repeat coronary angioplasty, one patient died and event free survival rate was found as 82,9%. In multivariate analysis, predictors of stent restenesis were the type of the lesi on and the diameter of the stent. In conclusion in a group of patient, which have heterogen elinical and angiographic characteristics, and in whom various stent types were used for all indications, primary success and six months event free survival rates were found to be high, angiographic restenesis rate were comparable to the single vessel elective stent implantation studies. Predictors of angiographic restenesis were the type of the lesi on and the diameter of the stent.