Flow diversion for acutely ruptured intracranial aneurysms treatment: A retrospective study and literature review

OBJECTIVE

Flow diversion is becoming an increasingly established practice for the treatment of acutely ruptured intracranial aneurysms. In this study the authors present a literature review and meta-analysis, adding a retrospective review of institutional registry on emergency treatment of aRIA with flow diverter stent.

MATERIALS AND METHODS

A systematic search of PubMed, SCOPUS, Ovid MEDLINE, and Ovid EMBASE was performed on April 20^th, 2021, extrapolating 35 articles. R language 'meta' and 'metafor' packages were used for data pooling. The DerSimonian-Laird model was used to calculate the pooled effect. The I² value and Q statistic evaluated study heterogeneity. Additionally, the authors retrospectively reviewed their institutional database for the treatment and outcomes of all patients with acutely ruptured intracranial aneurysms treated with flow diverter stent placement from May 2010 to November 2020 was performed.

RESULTS

From the systematic literature review and meta-analysis, the pooled proportion of complete aneurysm occlusion was 78%, with a pooled rate of 79%, 71%, 80%, and 50% for dissecting, saccular, fusiform, and mycotic aneurysms, respectively. The pooled proportion of aneurysm rebleeding and intrastent stenosis was 12% and 15% respectively, for a total of 27% rate. The analysis of authors retrospective register showed an overall mortality rate of 16.7% (3/18), with a low but not negligible postprocedural rebleeding and intrastent thrombosis rates (5.6% and 11.1% respectively).

CONCLUSION

Although increasingly utilized in the management of selected patients with acutely ruptured intracranial aneurysms, flow diversion for acutely ruptured intracranial aneurysms treatment presents rebleeding and intrastent stenosis rates not negligible.

Twenty Years of Experience in Juvenile Nasopharyngeal Angiofibroma (JNA) Preoperative Endovascular Embolization: An Effective Procedure with a Low Complications Rate

Juvenile nasopharyngeal angiofibroma (JNA) is a benign tumor of the nasal cavity that predominantly affects young boys. Surgical removal remains the gold standard for the management of this disease. Preoperative intra-arterial embolization (PIAE) is useful for reductions in intraoperative blood loss and surgical complications. In our series of 79 patients who underwent preoperative embolization from 1999 to 2020, demographics, procedural aspects, surgical management and follow-up outcome were analyzed. Embolization was performed in a similar fashion for all patients, with a superselective microcatheterization of external carotid artery (ECA) feeders and an injection of polyvinyl alcohol (PVA) particles, followed, in some cases, by the deployment of coils . Procedural success was reached in 100% of cases, with no complications such as bleeding or thromboembolic occlusion, and surgical intraoperative blood loss was significantly decreased. In conclusion, PIAE is a safe and effective technique in JNA treatment, minimizing intraoperative bleeding.

Ruptured Proximal Anterior Cerebral Artery Aneurysm Treated with Flow Diverter

AIM

This study aimed to discuss the use of flow modulation in treating ruptured aneurysms of the proximal segment of the anterior cerebral artery (A1 aneurysms). A1 aneurysms are rare, constituting approximately 1% of all intracranial aneurysms.

MATERIAL AND METHODS

We report a left A1 aneurysm with a wide neck and small sac (3 × 1.8 mm). In order to treat the lesion, a flow diverter (4 × 12-18 mm, FRED, Microvention) was placed from M1 to the proximal end of the paraophthalmic internal carotid artery, without directly covering the neck of the aneurysm. No procedural bleeding occurred. During stent deployment, abciximab was infused. A day after the procedure, double antiplatelet therapy was initiated for 1 month, followed by single antiplatelet therapy for another 3 months.

RESULTS

Due to the aneurysm morphology, we opted for a competitive flow diversion, covering the parent artery origin and leaving the A1A neck uncovered. A decreased flow into the aneurysmal parent artery gradually promoted aneurysm sac thrombosis. Both digital subtraction angiography at a 12-month follow-up and computed tomography angiography 24-month follow-up confirmed the regular patency of the stent and resolution of the aneurysm. In addition, the competitive modulation of flow in the ipsilateral anterior cerebral artery results in the narrowing of the vessel.

CONCLUSION

A1 aneurysm endovascular treatment is often challenging. Coiling or assisted coiling is the most frequently employed. Although flow diverter stent (FDS) is a consolidated technique for treating ruptured intracranial blister-like and dissecting aneurysms, its role in treating intracranial saccular ruptured aneurysms has to be elucidated. However, more number of case studies is needed to confirm the efficacy and safety of an FDS in treating ruptured A1 aneurysms.

Pressing Issues in COVID-19: Probable Cause to Seize SARS-CoV-2 for Its Preferential Involvement of Posterior Circulation Manifesting as Severe Posterior Reversible Encephalopathy Syndrome and Posterior Strokes

Since December 2019, a novel Severe Acute Respiratory Syndrome coronavirus 2 from China has rapidly spread worldwide. Although respiratory involvement is the mainstay of coronavirus disease 2019 (COVID-19), systemic involvement has recently drawn more attention. In particular, a number of recent articles have shed light on the nervous system as one of the possible targets. At our institution, we observed 15 patients with acute brain vascular manifestations; most interesting, we had a higher prevalence of the posterior circulation acute impairment. In our series, 7 patients had acute posterior cerebral injury: 1, hemorrhagic posterior reversible encephalopathy syndrome; 5, posterior circulation ischemic stroke; and 1, parieto-occipital hemorrhagic stroke. On the basis of our evidence and previous basic science reports, we believe a common etiopathogenetic thread may connect ischemic/hemorrhagic events of the posterior circulation and posterior reversible encephalopathy syndrome in the setting of COVID-19.