Bioabsorbable Stents Are Promising

Commenting on the results, interventional cardiology specialist, Professor Franz Eberli from the University Hospital Zurich (Switzerland) and official spokesperson for the European Society of Cardiology, said:

"In addition to the ABSORB study presenting the longest ever follow up data for a bioabsorbable stent, the investigators used multiple imaging systems, including Optical Coherence Tomography. This technical advance has allowed them to get really detailed images of the intra coronary structures for the first time. What really impressed me was the smoothness of the vessel wall at two years, and images showing the stents had disappeared to a great extent, which was a very promising finding.

Since in-stent late loss increased by only 0.05 mm between 6 months and two years, the most probable explanation for the in-stent late loss is early recoil after stent implantation. This indicates that this bioabsorbable stent initially is not exerting enough radial force to keep the vessels perfectly open. The challenge facing stent designers is to achieve a balance between sufficient radial strength, and a structure that can be reabsorbed in a reasonable time period. Industry is already acting on this data and looking to produce stronger second generation bioabsorbable stents by developing novel stent designs that retain integrity and radial strength for a longer time period.

The fact that vasomotion (the ability to undergo vasodilation and vasoconstriction) was restored in response to vasoactive agents in the stented vessel segment was a really good sign. It shows that after two years the physiological function of the stented part of the vessel has been almost completely restored, and that patients will not get any symptoms of angina or limitations in physical activity. In contrast, for first generation drug eluting stents, studies have shown "paradoxical vasoconstriction" in the area of the stent, where the vessel constricts instead of opening during exercise.”; Source: European Society of Cardiology