The peak systolic velocity ratio within the stent is useful for estimating restenosis after carotid artery stenting

Abstract

Objective: This study aims to assess the utility of stent intraluminal peak flow velocity ratios in predicting restenosis after carotid artery stent placement. Subjects and Methods: The study included 49 cases of carotid artery stent placement performed at our institution. The cases were divided into two groups: those requiring re-treatment and those with favorable postoperative outcomes. The main focus was on stent intraluminal peak systolic velocity (PSV) and the intraluminal flow ratio between the stent and the common carotid artery (referred to as stent intraluminal flow ratio). Results and Discussion: In the re-treatment group, intraluminal PSV was 219 ± 121 cm/s, intraluminal flow ratio was 3.6 ± 1.9, and plaque thickness was 1.8 ± 0.9 mm. In the favorable outcome group, PSV was 102 ± 52 cm/s, intraluminal flow ratio was 1.36 ± 0.6, and plaque thickness was 0.29 ± 0.59 mm. Statistically significant results (p < 0.05) were observed for PSV, flow ratio, and plaque thickness. A PSV > 160 cm/s had 87% sensitivity and specificity, a flow ratio of 1.96 had 87% sensitivity and 100% specificity, and a plaque thickness of 1.2 mm had 87% sensitivity and 90% specificity. Conclusion: The stent intraluminal flow ratio is a useful parameter for estimating postoperative restenosis.