Long-Term Outcomes of Extracranial Vertebral Artery Reconstruction in Managing Symptomatic Vertebral Artery In-Stent Restenosis or Occlusion

Introduction

The management of vertebral artery stenosis and occlusion is a critical component in preventing posterior circulation strokes, which can result in significant morbidity and mortality. Particularly challenging is the treatment of symptomatic vertebral artery in-stent restenosis or occlusion (SVISRO), which occurs after initial stent-assisted angioplasty (SAA). Despite advances in endovascular techniques, optimal therapy for SVISRO remains controversial. This study by Zhang et al. investigates the long-term efficacy of vertebral artery reconstruction surgery (VRS) compared to intensive medical therapy (IMT) in patients with SVISRO.

Study Design and Methods

This retrospective cohort study encompassed 62 patients treated at the Third Affiliated Hospital of Sun Yat-sen University from May 2011 to November 2021. Patients diagnosed with SVISRO post-SAA were divided into two groups: those who underwent VRS targeting the extracranial vertebral artery (V1-V2 segments) and those managed with IMT, including antiplatelet and lipid-lowering therapies.

The primary endpoint was stroke recurrence during the follow-up period, with secondary endpoints including stroke-free survival rates and neurological status as measured by the modified Rankin Scale (mRS). Follow-up duration averaged approximately 68 months.

Key Findings

Patients in the VRS group (mean age 60.1 years) demonstrated markedly better long-term outcomes compared to the IMT group. The stroke recurrence rate was significantly lower in the VRS group (5.7%) versus the IMT group (25.9%; p=0.034). The stroke-free survival at approximately 154 months was 73.8% in the VRS cohort versus 33.9% in the IMT cohort. The hazard ratio from the log-rank test was 0.234 (95% CI, 0.063-0.871; p=0.048), indicating a substantially reduced risk of recurrent stroke following VRS.

Neurological outcomes were also superior in the VRS group, with significantly better mRS scores at the last follow-up (p=0.032). These findings suggest that targeted reconstructive surgery of the extracranial vertebral artery can effectively prevent stroke recurrence and improve functional outcomes in this high-risk patient population.

Discussion

The study by Zhang et al. provides strong evidence supporting vertebral artery reconstruction as a viable and effective intervention for SVISRO. Its impact on reducing stroke recurrence is particularly noteworthy given the limited therapeutic options currently available for restenosis or occlusion after endovascular therapy.

Mechanistically, VRS restores and maintains vessel patency, improves blood flow to posterior circulation structures, and potentially reduces the likelihood of further restenosis by addressing underlying atherosclerotic disease. The procedure’s benefits in neurological status underscore its role not only in stroke prevention but also in enhancing quality of life.

However, the study’s retrospective nature and the relatively small sample size suggest that further prospective, randomized trials are needed to confirm these findings. Additionally, careful patient selection and consideration of surgical risks are essential to optimize outcomes.

Expert Commentary

This research highlights a significant advancement in the management of complex vertebral artery conditions. While endovascular therapy remains the first-line treatment, surgical revascularization could serve as a crucial alternative or adjunct, especially in cases of in-stent restenosis or occlusion refractory to medical therapy. It is important to balance these benefits with potential surgical risks, including perioperative complications.

Clinicians should consider the location and extent of artery lesions, comorbidities, and the patient’s overall health when selecting treatment strategies. Incorporating multidisciplinary approaches involving neurosurgeons, vascular specialists, and neurologists can optimize personalized care.

Conclusion

The evidence from Zhang et al. indicates that extracranial vertebral artery reconstruction surgery offers a promising long-term benefit in reducing recurrent strokes and improving neurological outcomes for patients with SVISRO. As awareness of this effective intervention grows, it may become an integral part of comprehensive stroke prevention strategies targeted at posterior circulation ischemia.

Further research is warranted to validate these findings and refine patient selection criteria, aiming to establish VRS as a standard practice in appropriate cases of vertebral artery restenosis or occlusion.