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BIOFLOW V demonstrates potential of ultrathin bioresorbable sirolimus-eluting stent in PCI

Roshini Claire Anthony
03 Oct 2017

The use of an ultrathin, bioresorbable polymer sirolimus-eluting stent resulted in better outcomes compared with a durable polymer everolimus-eluting stent in patients undergoing percutaneous coronary intervention (PCI) for de-novo, native coronary lesions, according to findings from the BIOFLOW V trial.

“[T]hese findings … show significant differences in target lesion failure and target vessel-related myocardial infarction [MI] that favour ultrathin strut, bioresorbable polymer sirolimus-eluting stents over durable polymer everolimus-eluting stents,” said the researchers.

At 12 months, incidence of target lesion failure (a composite of cardiovascular death, target vessel-related MI, or ischaemia-driven target lesion revascularization) was lower among patients who received a bioresorbable polymer sirolimus-eluting stent compared with those who received a durable polymer everolimus-eluting stent (6 percent vs 10 percent; p=0.0399), which was mostly due to a lower incidence of target vessel-related MI among patients who received the bioresorbable stent (5 percent vs 8 percent; p=0.0155). [Lancet 2017;doi:10.1016/S0140-6736(17)32249-3]

The incidence of cardiac death between the patients receiving the bioresorbable and durable stents was comparable at 12 months (<1 percent vs 1 percent; p=0.1153), as was the incidence of clinically driven target lesion revascularization (2 percent in each group; p=0.6856), while incidence of in-hospital MI was higher among patients using a durable stent compared with a bioresorbable one (7 percent vs 4 percent; p=0.0295).

A pooled analysis of primary endpoint results from this trial as well as that from the BIOFLOW II and IV trials (n=2,208) showed a 100 percent Bayesian posterior probability of the noninferiority of the bioresorbable polymer sirolimus-eluting stent to the durable polymer everolimus-eluting stent (Bayesian estimate target lesion failure rate difference, -2.6 percent).

In this multicentre trial (90 hospitals in 13 countries), adults (n=1,334) with ischaemic heart disease undergoing elective or urgent PCI were randomized to receive an ultrathin strut (60 µm) bioresorbable polymer sirolimus-eluting stent (n=884, mean age 64.5 years, 25 percent female) or a durable polymer everolimus-eluting stent (81 µm, n=450, mean age 64.6 years, 27 percent female). Approximately 50 percent of patients had acute coronary syndrome, while about one-third had diabetes mellitus at baseline.

All patients received aspirin (≥150 mg in 24 hours) and either clopidogrel (75 mg/day), ticagrelor (90 mg BID), or prasugrel (10 mg/day or 5 mg/day for individuals <60 kg) prior to the procedure, and dual antiplatelet therapy for ≥6 months post-procedure.

“[I]t is possible that the thinner stent struts of the bioresorbable polymer sirolimus-eluting stent … contributed to the lower frequencies of procedure-related MI and stent thrombosis observed,” said the researchers. “This observation is particularly relevant because the difference in adverse events is observed during a period before complete polymer dissolution.”

“[I]f the benefit is found to be related to an ultrathin stent design, a new focus in iterative stent development could be to further minimize strut thickness while maintaining drug delivery and mechanical properties,” they said.

As there is no evidence to suggest a class effect, the researchers attest that each specific stent type should be tested in clinical trials to determine the comparable safety and efficacy of bioresorbable polymer vs durable polymer drug-eluting stents. They also cautioned that the results may not extend to the entire population due to trial design excluding certain high-risk groups.

 

 

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Most Read Articles
6 days ago
Living a sedentary lifestyle may increase the risk of cardiovascular diseases (CVD) even in people with healthy body mass index (BMI), reports a new study.
04 Feb 2019
The carbon-chain length of saturated fatty acids appears to be an important factor in determining its role in cardiovascular health, a recent study has found.
4 days ago
Olanzapine confers a modest therapeutic effect on weight compared with placebo in adult outpatients with anorexia nervosa, a study has shown. However, it does not appear to offer significant benefit for psychological symptoms.
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Treatment with secukinumab results in a higher rate of remission or low-disease activity at week 16 in patients with psoriatic arthritis as compared with placebo, according to a posthoc analysis of the FUTURE 2 study. This effect is sustained at 2 years and is evident in both tumour necrosis factor inhibitor-experienced and -naïve patients.