Three-year clinical follow-up after Palmaz-Schatz stenting
BD Klugherz,
DL DeAngelo,
BK Kim,
HC Herrmann,
JW Hirshfeld,
and
DM Kolansky
Cardiovascular Division, University of Pennsylvania Medical Center, Philadelphia, USA.
OBJECTIVES. Our goals were to examine late clinical outcome in a cohort of patients who electively received Palmaz-Schatz intracoronary stents, to identify specific predictors of outcome and to determine the time course of the development of ischemic cardiac events after stenting. BACKGROUND. Short-term results of Palmaz-Schatz intracoronary stenting have been promising, with a reduction in both angiographic restenosis and clinical cardiac events up to 1 year after stenting. METHODS. We analyzed the clinical outcomes in 65 consecutive patients who underwent stenting at least 3 years before analysis. Demographic, clinical and procedural predictors of survival and event-free survival, defined as freedom from myocardial infarction, stent-site percutaneous transluminal coronary angioplasty, coronary artery bypass graft surgery or death, were analyzed at a mean follow-up of 39 +/- 17 months. RESULTS. Absolute survival and event-free survival at 3 years were 88% and 56%, respectively. Three-year freedom from stent-site revascularization was 66%. Predictors of decreased long-term survival (p < 0.05) included diabetes and a high angina score (Canadian Cardiovascular Society class III/IV) at 6 and 12 months after stenting. Predictors of decreased event-free survival (p < 0.05) included a high angina score at 3, 6 and 12 months after stenting, smaller stent deployment balloon size and greater number of stents implanted. Freedom from adverse events by 6 months after stenting also correlated with long-term event-free survival. Eighty-five percent of stent-site revascularizations occurred within 1 year. During late follow-up (>24 months), no patients had stent-site stenoses requiring revascularization, whereas 11% of patients required revascularization in nonstented coronary segments. CONCLUSIONS. Clinical predictors of worse long-term outcome included diabetes mellitus, higher angina score at follow-up, smaller stent deployment balloon size and greater number of stents at implantation. During follow-up, the majority of adverse events and stent-site revascularizations occurred early after stenting, and disease progression in nonstented vessels accounted for the majority of late revascularization events.
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