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J Am Coll Cardiol, 2006; 47:1356-1360, doi:10.1016/j.jacc.2005.05.102
(Published online 14 March 2006). © 2006 by the American College of Cardiology Foundation |
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Thoraxcenter, Erasmus Medical Center, Rotterdam, the Netherlands.
Manuscript received April 7, 2005; revised manuscript received May 12, 2005, accepted May 17, 2005.
* Reprint requests and correspondence: Prof. Patrick W. Serruys, Thoraxcenter, Ba-583, Dr. Molewaterplein 40, 3015-GD Rotterdam, the Netherlands. (Email: p.w.j.c.serruys{at}erasmusmc.nl).
| Abstract |
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BACKGROUND: Despite the implantation of SES in over a million patients to date, limited data exist on long-term outcomes.
METHODS: Sirolimus-eluting stents were used as the default strategy as part of the Rapamycin-Eluting Stent Evaluated at Rotterdam Cardiology Hospital (RESEARCH) registry. A total of 508 consecutive patients with de novo lesions exclusively treated with SES were compared with 450 patients who received bare stents in the immediately preceding period (pre-SES group).
RESULTS: Patients in the SES group more frequently had multivessel disease, more type C lesions, received more stents, and had more bifurcation stenting. At two years, the cumulative rate of major adverse cardiac events (death, myocardial infarction, or target vessel revascularization) was 15.4% in the SES group and 22.0% in the pre-SES group (hazard ratio [HR] 0.68, 95% confidence interval [CI] 0.50 to 0.91; p = 0.01). The two-year risk of target vessel revascularization in the SES group and in the pre-SES group was 8.2% and 14.8%, respectively (HR 0.53, 95% CI 0.36 to 0.79; p = 0.002).
CONCLUSIONS: In an unrestricted population, the beneficial effects of sirolimus-eluting stent implantation extend out to two years compared with bare-metal stents, driven by a reduction in re-intervention rates. These findings should be confirmed by the results of the large randomized trials.
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In porcine models, there have been some concerns regarding a late catch-up phenomenon whereby the initial benefits of SES disappear with time (5). Furthermore, initial attempts at developing an antirestenosis device using a radioactive stent demonstrated that in humans restenosis and neointimal hyperplasia were delayed but not prevented (6). Late "unpredictable" events have been anecdotally reported with drug-eluting stents (7,8).
In the treatment of unselected "all-comer" patients with complex disease, our group has previously reported on the intermediate results of the Rapamycin-Eluting Stent Evaluated at Rotterdam Cardiology Hospital (RESEARCH) registry, demonstrating that the use of SES is associated with significantly lower incidence of major adverse cardiac events (MACE) and target vessel revascularization (TVR) when compared with bare-metal stents (BMS) at one year in patients with de novo coronary artery lesions (9). The purpose of this report is to investigate whether the beneficial effects of SES extend beyond one year and to detail the major adverse cardiac events that have occurred between one and two years.
| Methods |
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Procedures and postintervention medications. All interventions were performed according to current standard guidelines with the final interventional strategy (including use of periprocedural glycoprotein IIb/IIIa inhibitors) at the operators discretion. Angiographic success was defined as residual stenosis <30% by visual analysis in the presence of Thrombolysis In Myocardial Infarction (TIMI) flow grade 3. All patients were advised to maintain lifelong aspirin. At least one-month clopidogrel treatment (75 mg/day) was recommended for patients treated in the pre-SES phase. For patients treated with SES, clopidogrel was prescribed for at least three months, unless one of the following was present (in which case clopidogrel was maintained for at least 6 months): multiple SES implantation (>3 stents), total stented length >36 mm, chronic total occlusion, and bifurcations.
Definition of major adverse cardiac events. Major adverse cardiac events were defined as: 1) death; 2) nonfatal myocardial infarction (MI); or 3) TVR. Myocardial infarction was diagnosed by a rise in the creatine kinase-MB fraction of more than three times the upper limit of normal (11). Target lesion revascularization (TLR) was defined as a repeat intervention (surgical or percutaneous) to treat a luminal stenosis within the stent or in the 5-mm distal or proximal segments adjacent to the stent. Target vessel revascularization was defined as a re-intervention driven by any lesion located in the same epicardial vessel.
Two-year follow-up data. For the two-year follow-up, survival data for all patients were obtained from municipal civil registries. A health questionnaire was sent to all living patients with specific questions on rehospitalization and major adverse cardiac events. As the principal referral center within the region, repeat procedures (percutaneous and surgical) are normally performed at our institution and recorded prospectively in our database. For patients who suffered an adverse event at another center, medical records or discharge summaries from the other institutions were systematically reviewed. General practitioners, referring cardiologists, and patients were contacted as necessary if further information was required.
Statistical analysis.
Continuous variables are presented as mean ± SD and were compared by means of the Student unpaired t test. Categorical variables are presented as counts and percentages and compared by means of the Fisher exact test. All statistical tests were two tailed. The cumulative incidence of adverse events was estimated according to the Kaplan-Meier method, and Cox proportional hazards models were used to assess risk reduction of adverse events. Patients lost to follow-up were considered at risk until the date of last contact, at which point they were censored. Multivariate analyses were performed to identify independent predictors of adverse events, using all clinical, angiographic, and procedural variables included in Tables 1 and 2.
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| Results |
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One-year follow-up. At one year, the cumulative incidence of death and death or myocardial infarction was similar between groups. Patients treated with SES had significantly less death, MI, or TLR at one year than patients treated in the pre-SES phase (8.8% vs. 12.6%, respectively; hazard ratio [HR] 0.66, 95% confidence interval [CI] 0.45 to 0.97; p = 0.03). Similarly, the one-year cumulative risk of MACE (death, MI, or TVR) was significantly reduced in the SES group (9.7% vs. 14.8% in the pre-SES group; HR 0.62, 95% CI 0.44 to 0.89; p = 0.008). The difference in outcomes between groups was mainly due to a decrease in the need for TVR in the SES group (5.1% vs. 10.9% in the pre-SES group; HR 0.49, 95% CI 0.29 to 0.82; p = 0.007).
Two-year follow-up. Follow-up information was obtained in 97.7% of patients. At two years, there were no significant differences in mortality between the SES and pre-SES groups, (5.8% vs. 6.3%; HR 0.92, 95% CI 0.55 to 1.54; p = 0.7) (Fig. 1A). The combined end point of death or MI were also similar (9.7% vs. 10.9%, respectively; HR 0.89, 95% CI 0.60 to 1.33; p = 0.6) (Fig. 1B). The two-year incidence of the combined end point of MACE was lower in the SES group than in the pre-SES group (15.4% vs. 22.0%; HR 0.68, 95% CI 0.50 to 0.91; p = 0.01) (Fig. 1C), driven by a significantly lower incidence of TVR in the SES group (8.2% vs. 14.8%, respectively; HR 0.53, 95% CI 0.36 to 0.79; p = 0.002) (Fig. 2).
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| Discussion |
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The reduction in the composite end point of MACE in the SES group was entirely driven by the component of TVR; the incidences of death and MI were similar in both groups in the follow-up period. This extends the finding of a large meta-analysis of drug-eluting trials that demonstrated no reduction in death or MI out to one year with drug-eluting stents (12).
In this study, although there was a trend toward fewer events in SES-treated patients (p = 0.16) between one and two years, the beneficial effect seen with SES at two years was driven primarily by the reduction in events in the first year. Thus, once the important beneficial effect of neointimal suppression had occurred during the period after stenting, the next step was to detect whether a later rebound phenomenon (as seen in porcine models) occurred in humans. This first-in-man study with serial angiographic and intravascular ultrasound studies was encouraging, demonstrating in a small population that neointimal suppression was preserved out to two years. In the RAVEL study, however, some nonsignificant late catch-up effect was noted in the SES arm, with six TLR versus none in the bare group seen between one- and three-year follow-ups; however, the overall incidence of TLR in the SES arm of remained significantly less than the bare group at three years (4,13).
In our registry, we did not observe any late catch-up phenomenon such as seen with radioactive stents and brachytherapy. In fact, during the second year, a trend toward a lower TVR rate was seen in the SES group compared with the pre-SES group (4.0% vs. 2.6%, respectively; p = 0.3) (Table 3). In addition to the previously described events, approximately 1% of patients in each group required repeat intervention for progressive disease in a previously nontreated vessel (non-TVR revascularization). Because these lesions do not benefit from the beneficial local effects of SES, it is imperative that intensive risk factor reduction, both physical and pharmaceutical, are implemented to reduce the potential for progression of remote lesions (14).
Although it was encouraging that no late angiographic stent thrombosis events were seen in either group out to two years, observation and interpretation of this rare and unexpected late complication requires a much larger sample size and longer term follow-up (15).
Conclusions. The medium-term follow-up of the RESEARCH registry demonstrates that in the real world SES reduce the incidence of major adverse cardiac events at two years of follow-up, primarily by a smaller need for repeat revascularization of the target vessel compared to bare-metal stents, already evident during the first year. The reduction in events was maintained during the second year with no evidence of a late-catch up effect. No late angiographic stent thrombosis was seen out to two years in this cohort of patients studied.
| Footnotes |
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| References |
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