Rescue Stenting for Failed Mechanical Thrombectomy in Acute Basilar Artery Occlusions: Analysis of the PC-SEARCH Registry.

Abstract

Background: We aimed to investigate whether rescue stenting (RS) following failed mechanical thrombectomy (MT) for acute basilar artery occlusion (BAO) results in superior functional outcomes and enhanced safety compared to the natural history of failed mechanical thrombectomy (MT).

Methods: This retrospective cohort study utilized data from the PC-SEARCH registry, encompassing eight high-volume centers in the United States and covering the period from 2015 to 2021. Patients with BAO who experienced failed MT (mTICI score of 0-2a after at least one attempt of clot retrieval) were categorized based on whether they received additional intervention with RS. The primary outcome was a shift analysis of the 90-day mRS. Multivariable logistic regression was employed to assess both efficacy and safety outcomes.

Results: Of a total of 444 patients, 119 presented failed MT and were included in the analysis. The RS group comprised 65 (14.6%) patients, while the control group consisted of 54 (12.2%) patients. After adjusting, the RS group showed a favorable shift in the overall 90-day mRS distribution (acOR=4.56; 95% CI 1.67-12.45; p=0.003) and higher rates of 90-day 0-3 mRS (RS: 44.6% vs. control: 18.5%, aOR=7.57; 95% CI 1.91-30.12; p = 0.004) compared to the control group. RS also showed lower rates of 90-day mortality (RS: 43.1% vs. control: 64.8%, aOR=0.27; 95% CI 0.09-0.80; p=0.018) and comparable rates of sICH (RS: 3.1% vs. control: 13%, aOR=0.31; 95% CI 0.05-1.95; p=0.214).

Conclusions: Our study demonstrated that RS is associated with improved functional outcomes and reduced mortality in BAO patients presenting MT failure. Further randomized trials are needed to validate these findings.