The Los Angeles motor scale (LAMS) and ASPECTS score are independently associated with DSA ASITN collateral score.

BACKGROUND: Mechanical thrombectomy (MT) is the treatment standard in eligible patients with acute ischemic stroke (AIS) secondary to large vessel occlusions (LVO). Studies have shown that good collateral status is a strong predictor of MT efficacy, thus making collateral status important to quickly assess. The Los Angeles Motor Scale is a clinically validated tool for identifying LVO in the field. The aim of this study is to investigate whether admission LAMS score is also associated with the American Society of Interventional and Therapeutic Neuroradiology (ASITN) collateral score on digital subtraction angiography (DSA). METHODS: We conducted a retrospective multicenter cohort study of consecutive patients presenting with AIS caused by LVO from 9/1/2017 to 10/1/2023 with diagnostically adequate DSA imaging. Demographic, clinical, and imaging data was collected through manual chart review. Both univariate and multivariate analysis were applied to assess associations. A p-value <0.05 was considered significant. RESULTS: A total of 308 patients (median age: 68, IQR: 57.5-77) were included in the study. On multivariate logistic regression analysis, we found that lower admission LAMS score (adjusted OR: 0.82, 95% CI: 0.68-0.98, p < 0.05) and higher ASPECTS score (adjusted OR: 1.21, 95% CI: 1.02-1.42, p < 0.05) were independently associated with good DSA ASITN collateral score of 3-4. CONCLUSIONS: Admission LAMS and ASPECTS score are both independently associated with DSA ASITN collateral score. This demonstrates the capability of LAMS to act as a surrogate marker of CS in the field.

Determinants of Timely Access to Recanalization Treatments and Outcomes in Pediatric Ischemic Stroke.

BACKGROUND: Timely revascularization in acute arterial ischemic stroke (AIS) is paramount for optimal outcomes. However, factors causing treatment delays in pediatric AIS remain understudied. We investigated determinants affecting the time from symptom onset or last-known-well to the start of recanalization treatment in pediatric AIS. METHODS: We conducted an ancillary analysis of the French KID-CLOT study (The National Retrospective Study of Recanalization Treatments in Pediatric Arterial Ischemic Stroke), considering patients with pediatric AIS receiving recanalization treatments (IV thrombolysis IVT and mechanical thrombectomy) from 2015 to 2018. The study assessed prehospital triage's impact, direct versus transferred admissions, and unit type (pediatric versus adult) on treatment delay and clinical outcomes using modified Rankin Scale at 1 year. RESULTS: Among 68 patients (median age, 11 [IQR, 4-16]; initial PedNIHSS, 13 [IQR, 7-19]), treatment modalities were IVT (n=31), and mechanical thrombectomy (n=23), and IVT+mechanical thrombectomy (n=14). Prehospital triage significantly reduced last-known-well to treatment delay (overall, 229 versus 270 minutes; P=0.01), most notably for and mechanical thrombectomy (P<0.001). There was no substantial delay difference between direct and transferred admissions, or between unit types, although a trend favored adult units (370.3 versus 436.73 minutes; P=0.06). Prehospital triage correlated with improved outcomes, with a shift to lower modified Rankin Scale scores (P=0.021). CONCLUSIONS: For pediatric AIS treated with reperfusion therapy, prehospital triage emerges as a pivotal factor in reducing treatment delays and enhancing outcomes. These findings underscore the need for a dedicated prehospital stroke protocol for children. REGISTRATION: URL: https://www.clinicaltrials.gov; Unique identifier: NCT03887143.

[Quality of life in acute ischaemic stroke patients treated with recanalisation]. / Rekanalizációs beavatkozással kezelt, akut ischaemiás stroke-os betegek életminosége.

Background and purpose:

Stroke is a serious health problem that has a significant impact on health-related quality of life. Despite the increasing popularity of measuring quality of life among patients, it is not routinely measured in clinical practice, and therefore little is known about how well clinical measures reflect quality of life after stroke. The aim of this study was to investigate the quality of life of patients with acute ischaemic stroke.

For the prospective study, patients diagnosed with acute ischemic stroke at the Neurology Clinic of the Clinical Center of the University of Pécs were selected through convenience sampling between June 2022 and May 2023. Based on the treatments, patients were divided into three groups: mechanical thrombectomy (MT), intravenous thrombolysis (IVT), and standard care (SC). Modified Rankin Scale (Pre-mRS, Follow-up mRS), NIH Stroke Scale (NIHSS), and European Quality of Life 5 Dimensions Scale (EQ-5D-5L) were used in the research. Descriptive statistics, paired T-tests, Wilcoxon tests, McNemar tests and Pearson correlation analysis were applied for the analysis (SPSS 25.0; p <0.05).

A total of 198 participants (115 males, 83 females) took part in the study (MT: 50, IVT: 69, SC: 79). The Pre-mRS and follow-up mRS values indicate that the majority of patients in all three groups fell into the mild category (Pre-mRS: 176 participants; 88%, follow-up mRS: 158 participants; 80%). There was a significant improvement in NIHSS scores in all three groups (IVT: 4.36 vs. 1.57, p<0.001; MT: 8.98 vs. 4.50, p<0.001; SC: 4.38 vs. 2.84, p<0.001). The EQ-5D-5L value also significantly increased for all groups (IVT: 0.82 vs. 0.88, p<0.001; MT: 0.63 vs. 0.73, p<0.001, SC: 0.76 vs. 0.80, p=0.014). Patients admitted with lower NIHSS values reported better quality of life at the end of our study (r: -0.43451).

At 30 days, significant improvement was observed in MT, IVT and SC groups when measured with EQ-5D-5L, but the extent of improvement was highest in the MT group.

Thrombectomy Outcomes for Anterior Circulation Stroke in the 6-24 h Time Window Solely Based On NCCT and CTA: A Single Center Study.

PURPOSE: Since perfusion imaging may be unavailable in smaller hospitals, alternative imaging selection methods for acute ischemic stroke can improve outcomes and optimize resources. This study assessed the safety and effectiveness of using imaging criteria other than DEFUSE 3 and DAWN for thrombectomy beyond 6 h from symptom onset in patients stroke in the anterior circulation. METHODS: This is a retrospective, single-center analysis of consecutive patients with large vessel occlusion in the anterior circulation undergoing thrombectomy. Patients were categorized into two groups based on the collateral status (moderate collaterals and good collaterals). RESULTS: Among 198 patients, 106 (54%) met the inclusion criteria and were analyzed. Good collateral status was observed in 78 (74%) patients. Patients with good collaterals showed significantly lower mRS scores at discharge and at 90 days compared to their counterparts with moderate collateral status (4 (3-4) vs. 4 (4-5); p = 0.001 and 2 (0-4) vs. 6 (3-6); p < 0.001, respectively). More patients with good collateral status achieved favorable outcomes at 90 days compared to those with moderate status (48 (61.5%) vs. 5 (17.9%); p < 0.001). Good collaterals were an independent predictor of good clinical outcomes at 90 days (OR = 1.31, 95% CI: 1.13-1.53, p < 0.001). CONCLUSION: Selecting patients for endovascular treatment of acute ischemic stroke using non-contrast CT and CT angiography shows 90-day outcomes similar to the DAWN and DEFUSE-3 trials. Using collateral status on CT angiography can predict favorable outcomes after mechanical thrombectomy in resource-limited settings where perfusion imaging is unavailable.

Neurointerventional payment for out-of-network mechanical thrombectomy in the era of the No Surprises Act.

BACKGROUND: Congress enacted the No Surprises Act (NSA) in 2021. The NSA relies on the ability for providers to appeal their out-of-network (OON) payment through an arbitration process known as Independent Dispute Resolution (IDR). This study was designed to evaluate the effective access to IDR for mechanical thrombectomy (MT). METHODS: This study uses a simulation to model the likelihood that neurointerventionalists have financially viable access to the NSA IDR process to seek adequate payment for MT OON claims. RESULTS: When evaluating professional claims, for only batches of four or more claims, would the expected payment recovery exceed the expected IDR costs. For global claims (both professional and technical components), a batch size of two claims would be required for the expected payment recovery to exceed expected IDR costs.For the 1000 simulations at large MT centers (300 MT annually), there were no instances where it would have been financially viable to submit professional-only OON claims to the IDR process. For global claims, it would have been financially viable to submit to IDR for only 13.2% of these claims. For smaller stroke centers, there were also no instances where it would have been financially viable to submit professional-only claims. For global claims, it would have been financially viable for only 3.3-6.1% of claims. CONCLUSIONS: The NSA process was designed to protect patients from unexpected bills following non-elective medical services. Given the emergent nature of many neuroendovascular cases and the lack of access to the IDR process as this model illustrates, the field is at risk for under-reimbursement due to NSA legislation.

Intra-arterial tenecteplase after successful endovascular therapy (ANGEL-TNK): protocol of a multicentre, open-label, blinded end-point, prospective, randomised trial.

BACKGROUND: Despite successful reperfusion after thrombectomy for large vessel occlusion (LVO) stroke, up to half of patients are dependent or dead at 3-month follow-up.The aim of the current study is to demonstrate safety and efficacy of administering adjunct intra-arterial (IA) tenecteplase in anterior circulation LVO patients who have achieved successful reperfusion defined as eTICI 2b50 to 3. METHODS: ANGEL-TNK is a multicentre, open-label, assessor-blinded endpoint, prospective randomised, controlled trial that will enrol up to 256 patients. Patients who meet inclusion criteria with anterior circulation LVO stroke and successful reperfusion will be randomised to receive IA tenecteplase or best medical management at 1:1 ratio. RESULTS: The primary endpoint is a 90-day excellent outcome defined as modified Rankin Scale (mRS) 0-1. The primary safety endpoint is symptomatic intracranial haemorrhage within 48 hours from randomisation. Secondary endpoints include 90-day ordinal mRS, mRS 0-2, mRS 0-3, all-cause mortality and any intracranial haemorrhage. CONCLUSION: In patients with anterior circulation LVO stroke, the ANGEL-TNK trial will inform whether adjunct IA tenecteplase administered after successful thrombectomy reperfusion improves patient outcomes. TRIAL REGISTRATION NUMBER: NCT05624190.

Home and workforce reintegration one year after thrombectomy in acute stroke patients.

INTRODUCTION: Endovascular thrombectomy (EVT) combined with intravenous thrombolysis is the current standard treatment for acute large-vessel occlusion stroke. Beyond clear clinical benefits in the acute and post-acute phases, comprehensive evaluations of long-term outcomes, including home and workforce reintegration, remain limited. This study aimed to assess home and workforce reintegration 1 year post-EVT in a cohort of acute stroke patients and explore their association with health-related quality of life (HRQoL). PATIENTS AND METHODS: We conducted a prospective observational study of 404 patients undergoing EVT at a tertiary university medical center between October 2019 and December 2021. Patients' functional outcomes were evaluated using the modified Rankin Scale (mRS), and HRQoL was assessed via the European Quality of Life Five Dimension Scale (EQ-5D). Data on occupational and living status were collected through standardized telephone interviews at 3- and 12-months post-treatment. RESULTS: Of 357 patients with 12-month follow-up data, 33.6% had a favorable outcome (mRS 0-2). Among stroke survivors, the rate of home reintegration without nursing care was 42.1%, and workforce reintegration among previously employed patients was 43.3% at 12 months. Both outcomes were significantly associated with improved HRQoL. Lower neurological deficits and younger age were predictive of successful home and workforce reintegration. DISCUSSION AND CONCLUSION: One year post-EVT, approximately 40%-50% of acute stroke patients successfully reintegrate into home and work settings. These findings underscore the need for ongoing support tailored to improving long-term reintegration and quality of life for stroke survivors. DATA ACCESS STATEMENT: The data supporting the findings of the study are available from the corresponding author upon reasonable request and in accordance to European data privacy obligations.

Mitigating health disparities by improving access to catheter-based therapies for vulnerable patients with acute pulmonary embolism.

INTRODUCTION: This study explores the implementation and outcomes of catheter-based thrombectomy (CBT) for acute pulmonary embolism (PE) within a safety-net hospital (SNH), addressing a critical gap in the literature concerning CBT in underserved and vulnerable populations. METHODS: This is a retrospective study of patients undergoing CBT between October 2020 and January 2024 at a SNH. The primary outcome was 30-day all-cause mortality. RESULTS: A total of 107 patients (47.6 % female, mean age 58.4 years) underwent CBT for acute PE, with 23 (21.5 %) high-risk and 84 (78.5 %) intermediate-risk PE. Demographically, 64 % identified as Black, 10 % White, 19 % Hispanic or Latino, and 5 % Asian. In terms of insurance coverage, 50 % had private insurance or Medicare, 36 % had Medicaid, and 14 % were uninsured. Notably, 67 % of the patients resided in high poverty rate zip codes and 11 % were non-citizen non-residents. Over a median follow up period of 30 days, 6 (5.6 %) patients expired (all high-risk PE), 3 of whom presented with cardiac arrest. No patients who presented with intermediate-risk PE died at 30 days. There was no difference in 30-day mortality based on race, insurance type, poverty level or citizenship status. CONCLUSION: Our study findings reveal no disparities in access or outcomes to CBT at our SNH, emphasizing the feasibility and success of implementing PERT and CBT at a SNH, offering a potential model to address healthcare disparities in acute PE on a broader scale.

Aspiration of Right Atrial Tumor Metastasis.

A 72-year-old man with cirrhosis had undiagnosed hepatocellular carcinoma with distant metastasis occupying nearly the entire right atrium. He was a poor surgical candidate because of his bleeding risks and advanced liver cirrhosis. He successfully underwent urgent large-bore aspiration thrombectomy under simultaneous echocardiography and fluoroscopy, thus leading to a diagnosis of metastatic malignant disease.

Rapidly Progressive Right Atrial Mass Secondary to Metastatic Hepatocellular Carcinoma.

Although the differential diagnosis for cardiac masses is broad and includes both benign and malignant primary cardiac tumors, metastases of noncardiac primary malignancies to the heart are an important etiology. We present an unusual case of a rapidly progressive right atrial mass caused by metastatic hepatocellular carcinoma.

Safety and effectiveness of SOFIA/SOFIA PLUS for direct aspiration as first line treatment in patients with acute anterior ischemic stroke: results from the prospective, multicentric SESAME study.

Background: Mechanical thrombectomy is a cornerstone treatment for acute ischemic stroke (AIS) with large vessel occlusion (LVO), yet the optimal technique remains debated. The SOFIA/SOFIA PLUS catheter has emerged as a promising tool for direct aspiration thrombectomy. Purpose: This prospective multi-center study, adhering Good-Clinical-Practice guidelines, aimed to evaluate the safety and efficacy of the SOFIA/SOFIA PLUS catheter for direct aspiration as a first-line treatment technique in patients with acute anterior circulation LVO. Materials and methods: Between 10/2017 and 12/2021, 246 consecutive patients presenting with AIS due to anterior circulation LVO were enrolled from 14 European centers. Primary treatment with SOFIA catheters was performed within 6 h of symptom onset. Clinical and radiological data were collected, and statistical analyses were conducted. Results: The mean age of the included patients was 71.6 ± 13.9 years, with 44.7% being male. Primary aspiration achieved complete recanalization in 72.8% of patients, with functional independence observed in 63.8% after 90 days. Secondary outcomes included a median NIHSS of 4 at 24 h post-procedure, median ASPECTS of 7 on follow-up imaging, and a mortality rate of 24.4% at 90 days. No device malfunctions were observed, and the rate of symptomatic intracranial hemorrhage was 4.4%. Conclusion: Primary aspiration with the SOFIA/SOFIA PLUS catheter demonstrates favorable safety and efficacy profiles in the treatment of anterior circulation LVO. These findings support the utilization of this technique as a first-line approach in mechanical thrombectomy for AIS, contributing to the growing body of evidence endorsing the effectiveness of direct aspiration thrombectomy in stroke management.

Thrombectomy for patients with a large infarct core: a study-level meta-analysis with trial sequential analysis.

Background: The effectiveness and safety of endovascular treatment compared with medical management alone regarding outcomes for patients with a large infarct core remain uncertain. Objectives: To juxtapose the clinical outcomes of thrombectomy versus the best medical care in patients with a large infarct core. Design: Systematic review and meta-analysis. Data sources and methods: We conducted searches in PubMed, Cochrane, and Embase for articles published up until November 8, 2023. Randomized trials were selected for inclusion if they encompassed patients with large vessel occlusion and sizable strokes receiving thrombectomy. The primary outcome was functional outcomes at 3 months after pooling data using random-effects modeling. Safety outcomes included mortality at 3 months, symptomatic intracranial hemorrhage (SICH), and decompressive craniectomy. We performed a trial sequential analysis to balance type I and II errors. Results: From 904 citations, we identified six randomized trials, involving a cohort of 1897 patients with a large ischemic region. Of these, 953 individuals underwent endovascular thrombectomy. At 3 months, thrombectomy was significantly correlated with better neurological prognosis, as evidenced by the increased odds of good functional outcomes (odds ratio (OR), 2.90; 95% confidence interval (CI), 2.08-4.05) and favorable functional outcomes (OR, 2.40; 95% CI, 1.86-3.09). Mortality rates did not demonstrably diminish as a consequence of the endovascular management (OR, 0.78; 95% CI, 0.58-1.06). However, the incidence of SICH was greater in the thrombectomy group compared to those with only medical treatment (5.5% vs 3.2%; OR, 1.77; 95% CI, 1.11-2.83). The application of trial sequential analysis yielded definitive evidence regarding favorable function outcomes and a shift in the distribution of modified Rankin scale scores at 3 months; however, others remained inconclusive. Conclusion: The results from most of the included trials display consistency. Meta-analysis of these six randomized trials offers high-quality evidence that thrombectomy significantly mitigates disability in patients with a large infarction, while also increasing the risk of SICH. Trial registration: PROSPERO, CRD42023480359.

Multicenter clinical trial evaluating the safety and efficacy of mechanical thrombectomy using the Versi Retriever.

BACKGROUND: This study aimed to elucidate the safety and efficacy of mechanical thrombectomy using the Versi Retriever in patients with acute ischemic stroke (AIS). METHODS: This was a prospective, multicenter, single-arm study conducted at 10 institutes in Japan from December 2018 to March 2021 on mechanical thrombectomy using the Versi Retriever in patients with AIS. The primary efficacy outcome was the modified Rankin scale (mRS) 0-2 at 90 days after the procedure. The primary safety outcome was mortality within 90 days after the procedure. RESULTS: Fifty-eight patients with a mean age of 72.7 years were enrolled in the study. The primary efficacy outcome of mRS 0-2 at 90 days was 62.0% (95% CI 47.2-75.3%) in patients within 8 hours of stroke onset. The rate of immediate reperfusion of Thrombolysis in Cerebral Infarction (TICI) grade 2b-3 using the Versi Retriever in three passes was 78.0% (64.0-88.5%). The rate of final reperfusion of TICI 2b-3 was 100% (92.9-100%). The primary safety outcome of mortality within 90 days was 8.0% (2.2-19.2%) in patients within 8 hours of AIS onset. The incidence of intracranial hemorrhage within 24 hours was 12.0% (4.5-24.3%) for symptomatic cases and 32.0% (19.5-46.7%) for asymptomatic cases. CONCLUSION: The Versi Retriever proved to be a safe and effective option for mechanical thrombectomy in patients with AIS.

The value of quantitative dual-energy CT parameters in predicting delayed haemorrhage after thrombectomy in acute ischaemic stroke.

OBJECTIVE: This study investigates the predictive value of dual-energy CT Rho/Z quantitative parameters for delayed hemorrhage post-thrombectomy in patients with acute ischemic stroke MATERIALS AND METHODS: A retrospective analysis was conducted on 80 patients who underwent dual-energy CT after thrombectomy for acute ischemic stroke. Patients were divided into delayed hemorrhage/no delayed hemorrhage, symptomatic intracranial hemorrhage/asymptomatic intracranial hemorrhage and cerebral parenchymal hematoma/no cerebral parenchymal hematoma groups RESULTS: The quantitative parameters significantly associated with delayed hemorrhage are DEI and Zeff (p < 0.001), with the optimal cutoff values for DEI and Zeff being 0.045 and 9.355, respectively. The quantitative parameters significantly associated with symptomatic intracranial hemorrhage are DEI and Zeff (p < 0.001), with the optimal cutoff values being 0.064 and 9.422, respectively. The parameters significantly associated with cerebral parenchymal hematoma are DEI and Zeff (p < 0.001), with the optimal cutoff values for DEI and Zeff being 0.058 and 9.09, respectively CONCLUSION: The DEI and Zeff parameters derived from dual-energy CT Rho/Z analysis are valuable in predicting delayed hemorrhage, symptomatic intracranial hemorrhage, and cerebral parenchymal hematoma in patients with acute ischemic stroke following thrombectomy.

Repeated basilar tip occlusion due to atlantooccipital assimilation: a case report.

We describe an 82-year-old man with multiple cerebral infarctions due to vertebral artery dissection associated with an atlanto-occipital assimilation. Despite multiple thrombectomies and antithrombotic therapy changes, the patient developed thrombosis and recurrent infarction, due to mechanical damage to the vertebral artery possibly associated with abnormal cervical spine motion from atlanto-occipital assimilation. This case highlights the rare association between atlanto-occipital assimilation and stroke and the importance of considering structural abnormalities for stroke management.

Can the clot meniscus and claw signs predict thrombectomy and clinical outcomes in patients with stroke? A systematic review and meta-analysis.

BACKGROUND: The angiographic shape of an occlusion, like the clot meniscus sign and the claw sign, has been reported to potentially impact the recanalization rate and clinical outcome in patients undergoing mechanical thrombectomy for acute ischemic strokes. METHOD: Following PRISMA guidelines, a systematic literature search was conducted across PubMed, Scopus, Embase and Web of Science databases. Patients were grouped into clot meniscus/claw sign positive and negative groups based on the definitions obtained from each study. Primary outcomes included technical success, with a meta-analysis performed using a random-effects model to calculate proportions and odds ratios (OR) with 95% confidence intervals (Cl). RESULTS: We included seven studies recruiting 1572 patients. The results indicated that the positive and negative groups had comparable first-pass effect (OR 1.95; 95% CI 0.76 to 5.01; P=0.167) and final recanalization (OR 1.36; 95% CI 0.81 to 2.27; P=0.248) rates. However, the rate of having a favorable functional outcome was significantly higher in the positive group than in the negative sign group (OR 1.91; 95% CI 1.25 to 2.92; P<0.003). Within the sign-positive population, the use of contact aspiration was associated with a significantly higher rate of recanalization compared with using a stent retriever (OR 0.18; 95% CI 0.07 to 0.49; P<0.001). This result did not translate into a clinical impact, as both stent retriever and contact aspiration showed comparable rates of functional independence at 3 months (OR 0.22; 95% CI 0.02 to 2.33; P=0.210). CONCLUSION: The presence of the clot meniscus/claw sign is not associated with recanalization outcomes after thrombectomy. However, it might be a good sign to predict which thrombectomy technique might be associated with better recanalization, although current evidence may need further confirmation.

Association between basal ganglia infarction and hemorrhagic transformation after mechanical thrombectomy in acute ischemic stroke: insights from the DIRECT-MT trial.

BACKGROUND: Acute ischemic stroke (AIS) often leads to significant morbidity and mortality. Mechanical thrombectomy (MT) is an effective intervention for large vessel occlusion strokes. However, hemorrhagic transformation (HT) remains a critical post-procedural complication. This study investigates the relationship between basal ganglia infarction (BGI) and the risk of HT, particularly focusing on hemorrhagic infarction (HI) and parenchymal hematoma (PH). METHODS: Data from the DIRECT-MT trial were analyzed. Patients were categorized based on the presence of BGI identified on initial non-contrast CT. HT was classified into HI and PH following the Heidelberg criteria. Multivariate logistic regression, propensity score matching (PSM), and inverse probability of treatment weighting (IPTW) were used to assess the association between BGI and HT. RESULTS: Among 607 patients, 273 had BGI. BGI was associated with a higher risk of HT, specifically PH. The incidence of PH in the BGI group was 20% compared with 11% in the non-BGI group. Adjusted analyses, including PSM and IPTW, confirmed the significant association between BGI and PH with an adjusted odds ratio (aOR) of 2.51 (95% CI 1.49 to 4.22, P<0.001). However, no significant association was found between BGI and HI. CONCLUSIONS: BGI significantly increases the risk of PH following MT for AIS, underscoring the need for tailored therapeutic strategies in managing these patients. No significant correlation was observed between BGI and HI. Future research should explore the underlying mechanisms and validate these findings across diverse populations to improve patient outcomes.

Poor venous outflow is associated with hyperintense acute reperfusion marker on follow-up MRI in patients with acute ischemic stroke with a large vessel occlusion.

BACKGROUND: Hyperintense acute reperfusion marker (HARM) refers to delayed enhancement in the subarachnoid or subpial space on post-contrast fluid attenuated inversion recovery (FLAIR) images. HARM is a measure of blood-brain barrier breakdown, which has been correlated with poor outcomes in patients with acute ischemic stroke with large vessel occlusion (AIS-LVO). We hypothesized that unfavorable venous outflow (VO) would be correlated with HARM after thrombectomy treatment of AIS-LVO. OBJECTIVE: To determine whether poor VO is associated with HARM on follow-up MRI after stroke in patients with AIS-LVO. METHODS: Patients with AIS-LVO from the prospective CRISP2 and DEFUSE2 studies with a baseline CT angiography (CTA) scan and a follow-up MRI with FLAIR sequence were screened for enrollment. VO was measured on the baseline CTA scan using the cortical venous opacification score (COVES). HARM was determined on FLAIR sequences at the follow-up MRI. The primary outcome was the occurrence of HARM between those with good VO (VO+; COVES 3-6) and bad VO (VO-; COVES 0-2). RESULTS: 121 patients were included; 60.3% (n=73) had VO+ and 39.7% (n=48) had VO-. Patients with VO- had higher presentation National Institutes of Health Stroke Scale scores (18 (IQR 12-20) vs 12 (IQR 8-16) in VO+; P<0.001). Middle cerebral artery M1 segment occlusions were more common in VO- patients (65% vs 43% VO+; P=0.028). VO- patients also had a larger pre-treatment ischemic core (23 (4-44) mL vs 12 (3-22) mL in VO+; P=0.049) and Tmax >6 s volumes (105 (72-142) mL vs 66 (35-95) mL in VO+; P<0.001). VO- patients were more likely to develop HARM after thrombectomy (31% vs 10% in VO+; P=0.003). On multivariable regression analysis, VO- (OR=3.6 (95% CI 1.2 to 10.6); P=0.02) and the presence of any ICH (OR=3.6 (95% CI 1.2 to 10.5); P=0.02) were independently associated with the occurrence of HARM. CONCLUSIONS: In patients with AIS-LVO, VO- correlated with HARM on post-thrombectomy MRI.