Safety results from the treatment of 109 cerebral aneurysms using the Woven EndoBridge technique: preliminary results in the United Kingdom

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OBJECTIVE

The Woven Endobridge (WEB) device has been in clinical use for the treatment of brain aneurysms for the past 4 years. Observational studies to assess clinical outcome and related complications have been published. Clear evidence is required to better understand the safety profile of the WEB device. The authors here present a multicenter series that provides a detailed safety analysis focused on patient selection, procedural events, and technical issues of treated patients throughout the United Kingdom (UK).

METHODS

A nationwide password-protected database was set up to collect anonymous information across the UK (14 centers). Complications and clinical outcome were analyzed for the initial 109 patients (112 procedures). An independent root cause analysis classified the complications into groups (procedural, disease, device, ancillary device, and other). The modified Rankin Scale (mRS) was used as a marker of clinical outcome.

RESULTS

Each of the 109 patients had 1 aneurysm suitable for WEB treatment (109 aneurysms). Three patients had 2 procedures, making a total of 112 procedures performed. Eight procedures were abandoned because of access issues; 2 patients went on to have a successful procedure. All 109 patients had a preprocedure and discharge mRS scores recorded. One hundred patients had a recorded mRS score from a > 3-month follow-up.

Deployment of the WEB device was successful in 103 (94.5%) of 109 patients and 104 (92.9%) of 112 procedures. One patient had 2 successful WEB procedures on separate occasions. Patients without a successfully implanted WEB device were included in the analysis. Selection analysis showed that the average patient age was 56.5 years among 34 men and 75 women. The percentage of incidental aneurysms was 58.7%, acute 16.5%, symptomatic 18.3%, and recurrent 6.4%. Further results analysis showed that 40 (36.7%) of 109 patients had recorded adverse events, including those unrelated to the WEB device. Events that could be related to the WEB device numbered 17 (15.6%) among the 109 patients. Two patients with device-related complications were symptomatic. Overall, 11 patients (10.1%) had persistent clinical sequelae. Thromboembolism was the most prevalent event, affecting 15.6% of the patients (17 of 109), and 6.4% of the patients (7 of 109) with a thromboembolism were symptomatic.

Overall mortality before discharge was 0% and at the > 3-month follow-up was 5% (5 of 100 patients). Morbidity was defined as an mRS score increase to > 2. Overall morbidity at discharge was 1.8% (2 of 109) and at the > 3-month follow-up was 6% (6 of 100). No device-related morbidity or mortality was associated with this group.

CONCLUSIONS

The UK data show that the WEB device is safe for clinical use. Thromboembolic complication adds a risk that should be minimized with appropriate anticoagulation and correct sizing of the device. There is scope for further evaluation and standardization of an anticoagulation regimen for the WEB device.

ABBREVIATIONS DL = double layer; ISAT = International Subarachnoid Aneurysm Trial; MCA = middle cerebral artery; mRS = modified Rankin Scale; SAH = subarachnoid hemorrhage; SL = single layer; SLS = single-layer sphere; UK = United Kingdom; WEB = Woven EndoBridge.

Article Information

Correspondence Tufail Patankar, Department of Neurosurgery, Leeds Teaching Hospitals NHS Trust, Great George St., Leeds LS1 3EX, United Kingdom. email: tufail.patankar@nhs.net.

INCLUDE WHEN CITING Published online February 3, 2017; DOI: 10.3171/2016.9.JNS152849.

Disclosures Dr. Gholkar is a consultant for Sequent Medical. Dr. Lamin has a consulting and training contract with Covidien, Sequent Medical, and Medtronic. Dr. Molyneux is a consultant for Sequent Medical. Dr. Patankar is a consultant for Sequent Medical, Stryker, and Pulsar Vascular and has received funding from Sequent Medical for statistical analysis in this study. Dr. Sellar is a consultant for Sequent Medical. Sequent Medical funded Axiom Fusion eClinical Suite to build the WEB UK study database and provided funding for the statistical analysis.

© AANS, except where prohibited by US copyright law.

Headings

Figures

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    A: A WEB DL device deployed from a catheter into a bifurcation aneurysm. B: A WEB SL device. C: A WEB SLS device. Copyright Sequent Medical. Published with permission. Figure is available in color online only.

  • View in gallery

    Pie chart demonstrating the distribution of aneurysm locations. ACA = anterior cerebral artery; ACOM = anterior communicating artery; ICA = internal carotid artery; PCA = posterior cerebral artery; PCOM = posterior communicating artery. Figure is available in color online only.

  • View in gallery

    Bar graph showing the percentage of patients receiving anticoagulation preprocedurally, intraprocedurally, and postprocedurally and who suffered thromboembolic complications. Figure is available in color online only.

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