Citations

Abstract Since the International Subarachnoid Aneurysm Trial, 1 endovascular treatment has been the favored treatment for appropriate ruptured intracranial aneurysms. While our endovascular technology has advanced to allow us to treat the majority of intracranial aneurysms, simple coil embolization is still the most common modality. This video demonstrates the fundamentals of aneurysm catheterization and coiling for safe treatment. In addition, the set-up and devices are detailed. This video is to add to the library of basic techniques that will aid a large number of practitioners. This patient consented to endovascular treatment. The video demonstrates endovascular coil embolization of a posterior communicating artery aneurysm in a 76-yr-old female who presented with a subarachnoid hemorrhage. Image of biplane suite in video used courtesy of Siemens Medical Solutions USA, Inc. Illustration at 5:12 reprinted from Yasargil MG, et al, Microneurosurgery IV B , p. 9, Thieme, New York, 1995.

Abstract Acute carotid terminus occlusion (CTO) is responsible for up to 5% of acute ischemic strokes secondary to emergent large vessel occlusion (ELVO) and up to 20% of acute internal carotid artery (ICA) occlusions. 1 The term “CTO” has also been used to describe occlusions in the supra-clinoid segment or at the bifurcation of the ICA. Compared to other ELVOs, patients with CTO present with higher stroke severity and larger infarct volume, likely to be a result of disruption of direct Circle of Willis collaterals across the anterior communicating artery (AComA) and posterior communicating artery (PComA). 2,3 Similary, CTO is usually associated with worse prognosis compared to other ELVOs in general. With regard to response to treatment, previous studies have reported significantly lower recanalization rates with intravenous alteplase with CTO compared to M1 segment occlusion. With regard to the safety and efficacy of mechanical thrombectomy, prior reports provide conflicting results with some reporting lower successful recanalization rates with CTO compared to M1 occlusion, and others reporting similar results. In our experience, we have found that successful recanalization of CTO can be achieved with a similar approach to M1 occlusions utilizing a direct aspiration first pass technique (ADAPT). 3,4 Herein, we present a case of CTO for which we performed mechanical thrombectomy using ADAPT. This procedure was an emergent standard of care procedure for which a consent was not required and so not obtained.

Abstract Tinnitus is an abnormal perception of a sound without external stimulation. Venous pulsatile tinnitus (VPT) is a specific form of tinnitus characterized by an objective and often subjective bruit that occurs as a result of localized venous abnormalities. Clinical evaluation relies on sound quality, duration, and precipitating factors. Idiopathic intracranial hypertension (IIH) and transverse sinus stenosis (TSS) are among the most common causes of VPT. Other causes include sigmoid sinus wall abnormalities (SSWAs), jugular vein anomalies (JVAs), and emissary veins anomalies. These anomalies can be detected on magnetic resonance imaging, magnetic resonance angiography/magnetic resonance venography, and high-resolution temporal bone computed tomography. The pathogenesis behind the VPT includes turbulent blood flow as a result of luminal stenosis or abnormal dilation, amplification of internal sound due to temporal bone defects, and abnormal position of the venous sinus system structures adjacent to the bony structures of the auditive apparatus. Based on these theories, different interventional treatment modalities can be applied to treat the underlying causes. Endovascular treatments have shown high efficacy and safety among those treatments which include stenting of the lateral sinus stenosis in IIH and TSS, coiling of the SSWA and JVA, and embolization of emissary veins anomalies. Further studies are needed to understand the natural history of these anomalies and the efficacy of treatments of VPT, which—unlike other types of tinnitus—can be cured with proper treatment.

Objective To systematically analyse prior reports of carotid endarterectomy (CEA) performed in cases of ≤50% carotid stenosis in order to understand patient tolerance and potential benefit. Methods A systematic review and descriptive analysis was performed in concordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. An English-language search was performed of online databases using librarian-selected search terms. Abstracts were reviewed for relevance which included mention of carotid endarterectomy and stenosis. Prospective or retrospective observational cohort studies that reported series of patients who underwent endarterectomy for minimal (≤50%) luminal stenosis with reported outcomes were included. Results Six studies (which included our institutional series) with a total of 143 patients met the inclusion criteria. The weighted mean age at the time of CEA was 72.3 years; 113 (79.0%) were male. 55.8% of patients with available data had recurrent ipsilateral ischaemic events despite medical therapy. Two patients out of 129 with available perioperative data (1.6%) had perioperative MRI findings of acute ischaemic stroke, both within the hemisphere contralateral to the side of CEA. Of the 138 patients with available follow-up (mean, 36 months), none had recurrent ipsilateral ischaemic events. Conclusions Endarterectomy for symptomatic carotid disease causing ≤50% stenosis may be a potentially beneficial strategy to prevent stroke recurrence. Studies with robust methodology are needed to draw more definitive conclusions in terms of the safety and efficacy of endarterectomy for minimal stenosis with vulnerable features relative to intensive medical therapy.

Background and Purpose: Based on promising results of the Solitaire FR With the Intention for Thrombectomy (SWIFT) trial, Solitaire FR stent retriever device recently received the Food and Drug Administration (FDA) approval for recanalization of cerebral vessels in patients with acute ischemic stroke. Real world experience with this device since its FDA approval in the United States has not been previously described. Methods: We conducted retrospective analysis of consecutive acute ischemic strokes cases from March 2012 to July 2012 in 10 centers within the United States, where Solitaire FR was used as a single device or in conjunction with other intra-arterial endovascular approaches. Results: A total of 107 patients were identified (mean age, 64 years; male gender, 51%; mean admission NIHSS score 17). Mean time from symptom onset to angiogram (groin puncture) was 4 hrs 47 min. Intravenous thrombolysis with tissue plasminogen activator (tPA) was administered in 37% of cases. Other endovascular techniques utilized in conjunction with Solitaire FR included intra-arterial thrombolysis with tPA (12% of patients), aspiration thrombectomy with Penumbra system (29%) and stenting (17%). Complete recanalization (TIMI 2-3) was achieved in 88% of patients. The rate of sICH within the first 24 hours was 15%. In-hospital mortality was 24%. 30-day clinical follow up data was available on 82 (77%) patients. Of those, 28 patients (34%) had favorable functional outcome (defined as modified Ranking Scale,mRS≤2) and 22 patients (27%) had excellent functional outcome (mRS≤1) at 30 days. Three or more passes with the Solitaire device was associated with a higher incidence of mortality compared with patients requiring 1 or 2 passes only (43% and 18% respectively, p = 0.011). No statistically significant correlation between clot location or length and outcome was evident. Use of other devices with the Solitaire FR was correlated with worsened outcome (p=0.037). Conclusions: This is the first study describing real-world experience with Solitaire FR device outside the SWIFT trial in the United States. Out study shows that variety of other endovascular approaches are used in conjunction with Solitaire FR.

Background and Purpose: Ultrasound is the most commonly used imaging modality for assessment of carotid artery stenosis. A number of studies have demonstrated that surface irregularities, heterogeneous echotexture and hypoechoic plaques are risk factors for acute ischemic stroke. We performed a systematic review and meta-analysis of the literature to better define the risk of stroke based off of the sonographic characteristics of carotid plaques. Materials and Methods: We performed a comprehensive literature search evaluating the association of carotid plaque characteristics on ultrasound with ischemic outcomes. We included both case-control and cohort studies examining the relationship between complex plaque and acute ischemic stroke. Complex plaque was defined as plaque that had any of the following characteristics: heterogeneous plaque echogenicity, hypoechoic plaque, plaque neovascularization, plaque surface irregularity, plaque ulceration, and intraplaque motion. Meta-analyses using the random-effects model were performed for complex plaque and each of the individual complex plaque characteristics. Results: A total of 1013 articles were screened and 30 studies with 11528 patients (3054 symptomatic and 8474 asymptomatic) were included. The odds ratios for the association between complex plaque and ischemic symptoms was 5.18 (95%CI=4.63-5.79). Heterogeneous echotexture (OR=11.72, 95%CI=9.82-13.98), intraplaque motion (OR=1.57, 95%CI=1.02-2.41), plaque echolucency (OR=3.23, 95%CI=2.72-3.84), plaque neovascularity (OR=5.66, 95%CI=3.15-10.16) and plaque ulceration (OR=2.65, 95%CI=1.89-3.73) were all associated with ischemic symptoms. Surface irregularity without frank ulceration was not associated with ischemic symptoms (OR=1.35, 95%CI=0.98-1.86). Conclusions: Complex plaque, heterogeneous plaque echogenicity, hypoechoic plaque, plaque neovascularization, plaque ulceration and intraplaque motion are associated with ischemic symptoms. Assessment of carotid plaque on ultrasound provides stroke risk information beyond measurement of luminal stenosis.

Background: Given the uncertainty regarding clinical applicability of early treatment trials and lack of data on long-term disease progression, we evaluated the progression of stenosis and development of symptoms on patients with asymptomatic carotid artery stenosis (ACAS) treated with contemporary medical therapy over a prolonged follow up. Methods: Retrospective review of bilateral carotid arteries from consecutive patients diagnosed with moderate or severe ACAS, at our institution between 2000 and 2001. Patient vascular risk factors and treatments, cerebrovascular imaging, ipsilateral symptoms, and revascularization were recorded. Progression of stenosis was defined by change category of stenosis. Factors associated with symptomatic carotid disease were sought using univariate and multivariate logistic regression analysis. Results: We identified 214 patients (58.8% men; median age 70 years) and collected data on 349 vessels. Severe stenosis (>70%) upon diagnosis was present in 92(26.4%) vessels. All patients were on antithrombotics, 97% on antihypertensives, and 95% on statins. Median length of follow up was 13 years (range 5-14) and the mean number of time points with follow-up imaging was 8.1±3.9. Progression of stenosis was observed in 237(67.9%) vessels. 72(20.6%) patients developed symptomatic carotid stenosis (TIA in 14.4%, non-disabling stroke in 4%, and disabling stroke in 2.2%). Median time to appearance of first symptom was 6 years (range 1-13). Revascularization procedures were performed in 118(33.8%) vessels, including 73(61.9%) vessels which had become symptomatic. On multivariate analysis, baseline stenosis (OR 1.65, 95%CI 1.12-2.44), intracranial stenosis > 50% (OR 2.87, 95%CI 1.46-5.62), plaque ulceration (OR 3.41, 95%CI 1.34-8.69), silent infarction (OR 4.25, 95%CI 2.30-7.83), and previous history of TIA/stroke (OR 2.73, 95%CI 1.14-6.54) were associated with development of TIA/stroke ipsilateral to the carotid stenosis. Conclusions: There is a substantial rate of progression of stenosis in patients with asymptomatic carotid atherosclerosis over time despite adequate medical therapy. Over long-term follow up, one in five patients with ACAS developed ipsilateral TIA/stroke.

Background: Fever has been associated with worse clinical outcomes in aneurysmal subarachnoid hemorrhage (aSAH). However, the impact of the cause, severity, and duration of fever is not clear. We conducted this study to evaluate the impact of fever and subfebrile load and fever characteristics on functional outcome. Methods: We collected detailed information on fever onset, cause, severity, and duration during the ICU stay in a cohort of 586 consecutive patients with aSAH. Fever was defined as core body temperature ≥ 38.3°C. Subfebrile measurements were those between 37 and 38.2°C. Febrile and subfrebile loads were defined as number of hours with fever or subfebrile measurements. Poor outcome was defined as modified Rankin score (mRS) > 2. Univariate and multivariate logistic regression models were developed to define predictors of outcome using various categorizations of fever cause, severity, and duration. Results: 532/586 patients (90.9%) had fever for a mean of 2.1±3.0 days. Fever started within 24 hours in 69 (11.8%) and within 72 hours in 110 (18.8%). Poor outcome occurred in 175 patients (29.9%). On univariate analysis, days of fever, febrile load, fever onset within 24 hours, and fever onset within 72 hours were associated with poor outcome (all p<0.001), but subfebrile load was not (p=0.58). On multivariate model constructed with all variables associated with outcome on univariate analyses (including age, WFNS grade, modified Fisher grade) days of fever remained independently associated with poor outcome (OR 1.14 of poor outcome per day of fever, 95% CI 1.06-1.22; p=0.0006) displacing all other fever measures from the final model. Conclusions: The great majority of patients with aSAH are febrile during their ICU stay. Early onset of fever, number of hours with fever, and especially days of fever are associated with poor functional outcome. Conversely, the number of hours with elevated but subfebrile temperature does not influence clinical outcome. These data suggest that prolonged fever should be avoided, but subfebrile temperatures do not justify intervention.

Background: Flow diversion has been proposed as a valid option for patients with proximal internal carotid artery aneurysms. We analyzed a consecutive series of 38 patients with proximal (to the origin of the posterior communicating artery) internal carotid artery aneurysms treated with flow diversion over a 28-month interval. Methods: Clinical information and angiographic follow-up data were prospectively collected in a consecutive series of patients with proximal internal carotid artery aneurysms treated with flow diversion. No patients were lost to follow-up and every eligible patient (with at least 6 months of follow-up) underwent catheter angiography at 6 months. Results: The series include 38 patients (37 women and 1 man). Most of the aneurysms were large or giant and with a wide neck. In two patients, we failed to deliver the device to the target segment because of proximal vessel tortuosity; thus 36 patients underwent flow diversion. There were no permanent periprocedural neurological deficits. One patient experienced a transient neurological deficit and another patient suffered slight transient worsening of a third nerve paresis. Complete angiographic occlusion of the aneurysm was observed in 75% of patients at 6 months and in 87% of the eligible patients at one year. One patient was found to have asymptomatic internal carotid occlusion. Conclusion: Flow diversion is an effective and safe method to treat internal carotid artery aneurysms not amenable to other endovascular techniques.

Background and Purpose- It is important to know the costs for hospitalization for endovascular embolectomy patients so that comparisons can be made to payments to hospitals. Methods- Using the National Inpatient Sample, we evaluated the costs for hospitalization for patients treated with endovascular embolectomy in the United States from 2006-2008. The primary endpoint examined in this study was total hospital costs, and these were correlated with clinical outcome. Hospitalization costs were then compared with Medicare payments for their respective outcomes. MS-DRG 24 was the diagnostic related group code (DRG) for mechanical embolectomy with good outcome and MS-DRG 23 was the DRG code for mechanical embolectomy with major complications. Medicare payments were available at http://www.cms.hhs.gov . Results- A total of 3864 patients received endovascular embolectomy. 1649 patients were <65 years old and 2205 patients were ≥65 years old. Median hospital costs in 2008 dollars were $36,999 (IQR $26,662-$56,405) for patients with good outcome, $50,628 (IQR $33,135-$76,063) for patients with severe disability, and $35,109 (IQR $25,053-$62,621) for patients with mortality. Reimbursement in the year 2008 for DRG 24 (good outcome) was $22075 and reimbursement for DRG 23 (major complications) was $26639. Conclusions- Our study of the NIS shows that hospitalization costs in the United States for ischemic stroke patients treated with endovascular embolectomy are rather high, probably due to the serious nature of their illness. Medicare payments have not been adequate in reimbursing these hospitalizations. Further work is needed to ensure the future reconciliation of costs with payments.