Endovascular Management of Intracranial Vertebral Artery Dissection: Technical Nuances for the Preservation of Posterior Inferior Cerebellar Artery and Basilar Artery

Treatment of unruptured intracranial vertebral artery dissection aneurysms with Flow Diverter compared with conventional stent-assisted coiling-a single-center study

AIM

Flow diverters (FDs) are being increasingly used off-label for treatment of intracranial vertebral artery dissection aneurysms (IVADAs). However, the safety and efficacy of FDs for unruptured IVADAs remain unclear. This study was performed to investigate whether FDs-alone are safer and more effective than conventional stent-asisted coiling.

METHODS

We retrospectively analyzed 152 patients who underwent endovascular stenting from December 2011 to December 2022. The baseline data, aneurysm characteristics, surgical details, perioperative complications, follow-up angiography, and clinical outcomes were collected and compared between patients who underwent stenting with FD-alone versus conventional stent-asisted coiling. Propensity score matching was also conducted.

RESULTS

All 152 patients underwent successful endovascular therapy. Forty patients were treated with FDs-alone, and 112 were treated with conventional stent-asisted coiling (including 62 with double stents). The complete occlusion rate was 93.75% in the FD group and 93.61% in the conventional stent group (p = 0.979). The complication rate was 5.00% in the FD group and 8.93% in the conventional stent group (p = 0.653). The in-stent restenosis rate was 3.13% in the FD group and 5.32% in the conventional stent group (p = 0.615). The procedure duration was significantly shorter in the FD than conventional stent group (p = 0.034). After propensity score matching, 37 patients with FDs were successfully matched, and the procedure duration was still significantly shorter in the FD group (p = 0.042).

CONCLUSION

FD placement is a safe and effective treatment for IVADAs. It is also a simpler procedure with a shorter operation time than conventional stent placement.

TRIAL REGISTRATION NUMBER

ChiCTR2300074171 ClinicalTrials.gov ID:NCT06134557.

Exploring vertebral artery stump syndrome: An overlooked cause of posterior ischemic strokes. A narrative review of current management options

INTRODUCTION

Stump syndrome is defined as a clinical syndrome resulting from a distal intracranial vessel embolic stroke due to an extracranial vessel occlusion. Similar to the anterior circulation, the recurrence of ischemic strokes in territories supplied by the posterior circulation in the presence of vertebral artery occlusion is termed Vertebral Artery Stump Syndrome (VASS).

MATERIAL AND METHODS

We conducted a literature review, identifying 72 patients with transient ischemic attacks (TIAs) or ischemic strokes attributed to VASS, according to Kawano criteria. We categorized all patients in two groups focusing on the therapeutic management those who underwent primary medical treatment and those who received endovascular or surgical treatment either in acute or chronic phase.

RESULTS

In the anticoagulant therapy group, only 1 patient had a stroke recurrence. Among the 4 on antiplatelets, all had recurrences, but 3 benefited from switching to anticoagulants or endovascular therapy. In the endovascular therapy group, worse outcomes were linked to acute large vessel occlusion. Endovascular treatment of the vertebral artery, in a chronic phase, was explored in literature for recurrent TIAs or minor strokes suggesting that this could be a viable therapeutic alternative when medical treatment failed in preventing recurrence of ischemic stroke.

CONCLUSIONS

Some studies suggest that anticoagulant medical therapy may be beneficial for VASS and endovascular therapy has also been reported for selected patients. However, data on treatment outcomes and prognosis are still underreported, making treatment decisions challenging. Randomized Controlled Trials are needed to establish the optimal treatment approach.

Treatment of Intracranial Vertebral Artery Dissecting Aneurysms Using Pipeline Embolization Devices : A Multicenter Cohort Study

PURPOSE

Intracranial vertebral artery dissecting aneurysm (IVADA) is a rare type of aneurysm with high morbidity and mortality. Recently, the application of pipeline embolization devices (PEDs) has been extended to IVADAs. Here, we aim to investigate the safety and effectiveness of PEDs for IVADAs.

METHOD

We retrospectively reviewed the PLUS database to identify patients who had IVADAs and were treated with PEDs from 2014 to 2019 at 14 centers across China. Data including patient and aneurysm characteristics, procedure details, angiographic and clinical results, relationship with the ipsilateral posterior inferior cerebellar artery (PICA), and patency of the PICA following PED coverage were analyzed.

RESULTS

In this study 52 consecutive patients with 52 IVADAs were included. The mean age was 52.33 years and 82.7% were male. With a median follow-up of 10.5 months, the complete occlusion rate was 93.8% (45/48) and no recurrence or in-stent stenosis was detected. The total postoperative complication rate and mortality were 11.5% and 1.9%, respectively. Complications occurred in 9.6% (5/52) of patients within 30 days after the operation, including ischemic stroke in 3 and hemorrhagic stroke in 2. Another patient suffered an ischemic stroke at follow-up, 78.8% (41/52) PICAs were covered by PEDs, 1 case (2.4%) had a functional disability due to PICA occlusion, while 39.0% (16/41) had reduced flow during follow-up but hardly caused any obvious neurological deficits. Patients with IVADA involving PICA had a trend towards more complications (66.7% vs. 51.1%; P = 1).

CONCLUSION

Treating IVADAs with PEDs may be a safe and effective option, with favorable clinical and angiographic outcomes; however, complications associated with this treatment should not be ignored.

REGISTRATION

http://www.

CLINICALTRIALS

gov . Unique identifier: NCT03831672.

Vertebral artery dissection managed by interventional radiology

A 21-year-old patient presented with sudden-onset headache, visual disturbance and left hand incoordination. She was diagnosed with a left vertebral artery dissection of the V3 segment resulting in multiple cerebellar and cerebral infarcts. There were no risk factors for dissection other than recent COVID-19 infection. She was treated initially with antiplatelets, followed by anticoagulation, but experienced recurrent ischaemia. Although guidance suggests endovascular repair may be beneficial for patients with cerebral artery dissection (CAD) who experience recurrent strokes on medical therapy, evidence is limited. After multidisciplinary team consideration of the individual patient anatomy and risks and benefits of different endovascular techniques, the patient was treated with endovascular coiling. At 10 months follow-up, she had no further strokes and improving neurological symptoms. The case highlighted COVID-19 as a potential trigger for CAD and the use of endovascular coiling in preventing catastrophic cerebral ischaemia in CAD refractive to medical therapy.

Endovascular Treatment of Intracranial Vertebral Artery Dissection

Intracranial vertebral artery dissection (VAD) is the most common arterial dissection in intracranial arteries. Some types of VAD can heal spontaneously after reconstitution of the vessel lumen with excellent prognosis, whereas others can progress to stroke that needs treatment. Recently, endovascular treatment (EVT) has emerged and is suggested as a treatment option for VADs due to perceived low rates of procedure-related morbidity with good efficacy. In the last decade, we have accumulated our strategies to treat those VADs. Here, we try to share our experiences about VADs, including indications and methods of treatment of VADs using EVT. We perform EVT for ruptured VADs presenting with SAH and some of unruptured VADs such as VAD with recurrent or progressive ischemia, dissecting aneurysm larger than 7 mm or with mass effect, early ugly change of VADs in shape and size during follow-up period, involving the basilar artery (BA) and bilateral VADs. We present how we have done in our real practice for the last decade for treating VADs by EVT rather than reviewing and organizing so-far-published literature. We tended to occlude the rupture point by vertebral artery (VA) occlusion in non-dominant VA or stent-assisted coiling in dominant VA for ruptured VADs. We tended to reconstruct original hemodynamics using various stents for unruptured VADs. To decide what to treat and how to treat are very complicated for VADs. However, we believe that EVT is the current mainstay for treating VADs. Each technique of EVT should be determined on a case-by-case basis at the discretion of endovascular neurosurgeons and/or interventional neuroradiologists according to presenting symptoms, hemodynamic status, including sufficiency of the collateral supply and anatomic features of the vertebrobasilar artery as well as the posterior inferior cerebellar artery, anterior spinal artery, and medullary perforators.