Key result
Overlapping drug-eluting stents in low-grade stenosis had more uncovered or malapposed struts than in high-grade stenosis (59.4% vs 32.6%, p=0.03), while restenosis occurred exclusively in HGS.
Why the study?
Does baseline disease severity at the site of stent overlap affect angiographic, IVUS, and OCT outcomes at 6 months?
Population
71 patients with a total of 86 overlapping stents
Comparison
Stent overlap at high-grade stenosis vs Stent overlap at low-grade stenosis
Design
Cohort, Images analysed by an independent core laboratory
Follow-up
6 months
Authors
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Overlap in low-grade stenosis may increase uncovered struts; hypothesis-generating for site selection and requires randomized confirmation.
RCT (n=71)
randomised
Does baseline disease severity at the site of stent overlap affect angiographic, IVUS, and OCT outcomes at 6 months?
Absolute Event Rate: 32.6% vs 59.4%
p-value: p=0.03
Overlapping drug-eluting stents in normal-appearing coronary segments is associated with a higher incidence of uncovered or malapposed struts, while restenosis occurs primarily when overlapping at high-grade stenosis.
Tahara et al. (2010) conducted an RCT in Coronary artery disease with overlapping stents (n=71). High-grade stenosis (≥70% diameter stenosis) at stent overlap vs. Low-grade stenosis (<70% diameter stenosis) at stent overlap was evaluated on Any uncovered or malapposed struts in overlapping drug-eluting stents (p=0.03). Overlapping drug-eluting stents in low-grade stenosis had more uncovered or malapposed struts than in high-grade stenosis (59.4% vs 32.6%, p=0.03), while restenosis occurred exclusively in HGS.
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