Outcomes after coverage of lenticulostriate vessels by flow diverters: a multicenter experience

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OBJECTIVE

With the increasing use of flow diversion as treatment for intracranial aneurysms, there is a concomitant increased vigilance in monitoring complications. The low porosity of flow diverters is concerning when the origins of vessels are covered, whether large circle of Willis branches or critical perforators. In this study, the authors report their experience with flow diverter coverage of the lenticulostriate vessels and evaluate their safety and outcomes.

METHODS

The authors retrospectively reviewed 5 institutional databases of all flow diversion cases from August 2012 to June 2018. Information regarding patient presentation, aneurysm location, treatment, and outcomes were recorded. Patients who were treated with flow diverters placed in the proximal middle cerebral artery (MCA), proximal anterior cerebral artery, or distal internal carotid artery leading to coverage of the medial and lateral lenticulostriate vessels were included. Clinical outcomes according to the modified Rankin Scale were reviewed. Univariate and multivariate analyses were performed to establish risk factors for lenticulostriate infarct.

RESULTS

Fifty-two patients were included in the analysis. Postprocedure cross-sectional images were available in 30 patients. Two patients experienced transient occlusion of the MCA during the procedure; one was asymptomatic, and the other had a clinical and radiographic ipsilateral internal capsule stroke. Five patients had transient symptoms without radiographic infarct in the lenticulostriate territory. Two patients experienced in-stent thrombosis, leading to clinical MCA infarcts (one in the ipsilateral caudate) after discontinuing antiplatelet therapy. Discontinuation of dual antiplatelet therapy prior to 6 months was the only variable that was significantly correlated with stroke outcome (p < 0.01, OR 0.3, 95% CI 0–0.43), and this significance persisted when controlled for other risk factors, including age, smoking status, and aneurysm location.

CONCLUSIONS

The use and versatility of flow diversion is increasing, and safety data are continuing to accumulate. Here, the authors provide early data on the safety of covering lenticulostriate vessels with flow diverters. The authors concluded that the coverage of these perforators does not routinely lead to clinically significant ischemia when dual antiplatelet therapy is continued for 6 months. Further evaluation is needed in larger cohorts and with imaging follow-up as experience develops in using these devices in more distal circulation.

ABBREVIATIONS ACA = anterior cerebral artery; AChA = anterior choroidal artery; AICA = anterior inferior cerebellar artery; DAPT = dual antiplatelet therapy; DWI = diffusion-weighted imaging; FD = flow diverter; ICA = internal carotid artery; MCA = middle cerebral artery; OphA = ophthalmic artery; PCoA = posterior communicating artery; PED = Pipeline embolization device; PICA = posterior inferior cerebellar artery.
Article Information

Contributor Notes

Correspondence Peter Kan: Baylor College of Medicine, Houston, TX. peter.kan@bcm.edu.INCLUDE WHEN CITING Published online January 11, 2019; DOI: 10.3171/2018.8.JNS18755.Disclosures Dr. Thomas: support of non–study-related clinical or research effort from Stryker. Dr. Mokin: consultant for Penumbra, Inc. Dr. Puri: consultant for Stryker Neurovascular and Medtronic; direct stock ownership in InNeuroCo; and support of non–study-related clinical or research effort from Stryker Neurovascular and Metronic.
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