Comparison of the Everolimus Eluting Bioresorbable Vascular Scaffold System With a Drug-Eluting Metal Stent in Acute ST-Elevation Myocardial Infarction - ABSORB-STEMI TROFI II
The goal of the trial was to evaluate treatment with the everolimus-eluting bioresorbable vascular scaffold (BVS) compared with the everolimus-eluting metal stent among subjects with ST-segment elevation myocardial infarction (STEMI).
Contribution to the Literature: The ABSORB STEMI TROFI II trial showed that implantation of a BVS resulted in good arterial healing, which was similar to an everolimus-eluting metal stent.
Subjects with STEMI were randomized after partial establishment of coronary flow to a BVS (n = 95) vs. an everolimus-eluting metal stent (n = 96).
- Total number of enrollees: 191
- Duration of follow-up: 6 months
- Mean patient age: 59 years
- Percentage female: 18%
- Percentage diabetics: 19%
- STEMI within 24 hours of symptom onset
- Vessel size 2.25-3.8 mm
- Cardiogenic shock
- Severe vessel tortuosity or calcification
Other salient features/characteristics:
- Onset of symptoms to partial restoration of coronary flow: 177 minutes in the BVS group vs. 185 minutes in the metal stent group
- Nominal diameter of the scaffold/stent: 3.25 mm in the BVS group vs. 3.12 mm in the metal stent group (p = 0.005)
- Post-dilatation performed: 51% in the BVS group vs. 26% in the metal stent group (p < 0.001)
The primary outcome, healing score at 6 months, was 1.74 in the BVS group vs. 2.80 in the metal stent group (p for noninferiority < 0.001, p for superiority = 0.053).
Secondary outcomes were in-device late loss: 0.20 mm in the BVS group vs. 0.08 mm in the metal stent group (p = 0.01). Also, cardiovascular death, MI, or revascularization was 1.1% in the BVS group vs. 0% in the metal stent group. The one event in the BVS group was due to stent thrombosis.
Among individuals with STEMI, implantation of a BVS resulted in nearly complete vessel healing, which was noninferior to the everolimus-eluting metal stent. Clinical events were low; however, there was one case of stent thrombosis with the BVS. Future trials powered for clinical events are warranted.
Sabaté M, Windecker S, Iñiguez A, et al. Everolimus-eluting bioresorbable stent vs. durable polymer everolimus-eluting metallic stent in patients with ST-segment elevation myocardial infarction: results of the randomized ABSORB ST-segment elevation myocardial infarction—TROFI II trial. Eur Heart J 2015;Sep 24:[Epub ahead of print].
Presented by Dr. Patrick Serruys at the European Society of Cardiology Congress, London, September 1, 2015.
Keywords: Dilatation, Acute Coronary Syndrome, Drug-Eluting Stents, Myocardial Infarction, Myocardial Revascularization, Stents, Thrombosis, ESC Congress
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