LVIS stent-assisted coiling shows strong aneurysm occlusion in Chinese study

A single-center retrospective study in China found that LVIS stent-assisted coiling achieved high initial occlusion rates in wide-necked intracranial aneurysms and reduced blood-flow measures that remained improved at 6 months. The results point to possible hemodynamic benefits, but also highlight thrombosis risk and the need for larger prospective studies.

Why it matters: - Wide-necked intracranial aneurysms are difficult to treat because coils can shift into the parent artery during embolization. - The study suggests LVIS stent-assisted coiling may do more than hold coils in place. It may also reduce aneurysm inflow and wall shear stress. - Durable flow changes could matter because lower aneurysm flow is linked to thrombosis and healing. - The findings also show real procedural risk, including thrombosis, incomplete stent apposition, and one procedure-related death.

What happened: - A research team led by Professor Xiang Xu at Tangshan Gongren Hospital in China reviewed 61 patients with wide-necked intracranial aneurysms treated with LVIS stent-assisted coiling between January and December 2023. - The group included 35 ruptured aneurysms and 26 unruptured aneurysms. - The study was published in Volume 12 of the Chinese Neurosurgical Journal on June 29, 2026. - The paper is titled “Safety and hemodynamic efficacy of the LVIS stent in the endovascular treatment of intracranial wide-necked aneurysms: a single-center retrospective study.”

The details: - Initial angiography showed complete occlusion in 28 of 35 ruptured aneurysms, or 80.0%. - Initial angiography showed complete occlusion in 22 of 26 unruptured aneurysms, or 84.6%. - Follow-up angiography was available for 27 patients, or 44.3%, at 6-12 months. - All aneurysms that were completely occluded at baseline stayed occluded at follow-up. - Some aneurysms that were initially classified as Raymond-Roy Occlusion Classification class II improved to complete occlusion. - In ruptured cases, favorable functional outcomes, defined as modified Rankin Scale 0-1, rose from 57.1% at discharge to 77.1% at 3-6 months. - In unruptured cases, 25 of 26 patients, or 96.2%, had modified Rankin Scale 0-1 at discharge. - All surviving patients with unruptured aneurysms maintained favorable outcomes at follow-up. - A subset of 14 patients underwent computational fluid dynamics analysis before treatment, after treatment, and at 6 months. - In that subgroup, treatment reduced aneurysm inflow, the share of the aneurysm exposed to higher flow, and average wall shear stress. - Those changes remained significantly different from baseline at 6 months, with all P < 0.001. - The study describes the LVIS stent as a braided, self-expanding nitinol device with relatively high metal coverage. - The study also notes that the LVIS stent is designed as a scaffold across the aneurysm neck and may alter blood flow inside the aneurysm.

Between the lines: - The results are promising, but the study design limits how far they can be applied. - This was a retrospective, single-center study with clinically mixed patients and incomplete imaging follow-up. - The data support an association between LVIS-assisted coiling and favorable flow changes, but they do not prove causation. - The safety signal is mixed: two ruptured aneurysm patients had intraprocedural thrombosis and recovered without permanent neurological deficits, while one unruptured aneurysm patient died after delayed in-stent thrombosis and secondary cerebral hemorrhage. - Incomplete stent apposition occurred in 6 of 61 patients, or 9.8%, which may help explain thrombotic risk.

What's next: - The authors call for larger prospective comparative studies to test safety, efficacy, and patient selection. - Future work should examine stent deployment quality, thrombotic risk, and outcomes across both ruptured and unruptured aneurysms. - The study also points to a need for closer collaboration among neurointerventional, imaging, and computational researchers.

The bottom line: - LVIS stent-assisted coiling delivered strong early aneurysm occlusion and durable hemodynamic improvement in this study, but thrombosis risk and limited follow-up mean the device still needs stronger prospective evidence.