Underestimation of Stent Efficacy: Untreated Artery Events Distort Coronary Intervention Outcomes

Abstract

Background

Evaluation of percutaneous coronary intervention (PCI) effectiveness typically focuses on overall coronary events, often overlooking the specific location of these events within the coronary vasculature. This study aimed to evaluate the incidence of coronary events in patients treated with PCI and to investigate the correlation between these events, the location of the event within the treated site, and the type of stent used.

Methods

This study determined the proportion of coronary events occurring after percutaneous coronary intervention (PCI) and investigated the association between these events and the location of the previous treatment site. A retrospective cohort analysis was conducted on patients with stable coronary artery disease (CAD) who underwent PCI using either conventional or drug-eluting stents. Data was obtained from the MASS Clinical Research Unit database. The location of the coronary event was determined by angiography.

Results

Five hundred and sixty two patients were included, with 232 (41.3%) experiencing coronary events. 55.8% of the events occurred at the treated site, while the remaining 44.2% were unrelated to the treated site. Of the events related to the treated site, 54.1% occurred in the conventional stent group and 61.1% in the drug-eluting stent group. No statistically significant association was found between the event in the treated site and the type of stent used (p = 0.363).

Conclusions

A significant proportion of coronary events occurred in untreated sites. Our results suggest that isolated evaluation of the treated site may provide a more accurate estimate of the effectiveness of stents.