Abstract NS7: Presenting Symptoms and Response to Dysphagia Screen Predict Unfavorable Outcome in Acute Ischemic Stroke Patients Who Do Not Receive IV tPA Due to Mild and Rapidly Improving Stroke Symptoms

Background & Purpose: Studies have shown that patients who do not receive IV t-PA due to mild and rapidly improving stroke symptoms (MaRISS) are often not discharged home. The purpose of this study was to identify whether presenting symptoms and response to initial dysphagia screen can predict which patients not treated with IV tPA due to MaRISS have an unfavorable outcome. Methods: Acute ischemic stroke (AIS) patients presenting to hospitals participating in the Georgia Coverdell Acute Stroke Registry and not treated with IV t-PA due to MaRISS alone from January 1, 2009 through December 31, 2013 were included in this analysis. Patients who were unable to ambulate or needed assistance to ambulate prior to admission were excluded. Presenting symptoms and response to dysphagia screen were collected from retrospective chart review at participating hospitals. Multivariable regression analysis was used to identify factors associated with a lower likelihood of favorable outcome, defined as discharge to home. During the study period, < 1% of patients presenting to participating hospitals with MaRISS within the 3 hour time window received IV t-PA. Results: Of 841 AIS patients who did not receive IV-tPA due to MaRISS [median NIHSS 1 (Q1-Q3: 0-3)], 160 (19%) did not have a favorable outcome. Factors associated with lower likelihood of a favorable outcome included increasing NIHSS score (per unit OR 0.89, 95% CI 0.84 to 0.93), weakness as the presenting symptom (OR 0.50, 95% CI 0.30 to 0.84), and a failed dysphagia screen (OR 0.43, 95% CI 0.23 to 0.80). Conclusion: Nearly 1 in 5 AIS patients presenting with MaRISS were not discharged to home. Among AIS patients who present with MaRISS and do not receive IV thrombolytic therapy, baseline characteristics including increasing NIHSS score and weakness as a presenting symptom, and a failed dysphagia screen were all associated with a lower likelihood of discharge to home. Given the low rate of patients presenting during the study period, a prospective randomized trial to evaluate IV t-PA treatment focusing on this subgroup of patients is warranted.

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Abstract TP198: The Impact of Regular Employments on Hyper-Acute Ischemic Stroke

Stroke ◽

10.1161/str.51.suppl_1.tp198 ◽

2020 ◽

Vol 51 (Suppl_1) ◽

Author(s):

Takeo Sato ◽

Kenichiro Sakai ◽

Ryoji Nakada ◽

Tomotaka Shiraishi ◽

Teppei Komatsu ◽

...

Keyword(s):

Multivariate Analysis ◽

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Endovascular Therapy ◽

Positive Impact ◽

Favorable Outcome ◽

Stroke Patients ◽

Nihss Score ◽

Factors Associated ◽

The Impact

Background and Purpose: We aimed to investigate the differences in weekly variations of stroke occurrence between hyper-acute ischemic stroke patients with and without regular employments (RE), and the impact of RE on outcome. Methods: Consecutive symptomatic ischemic stroke patients with < 4.5 h from onset to door between October 2012 and May 2018 were enrolled. All the situations of employment on admission were obtained from interviews with the participant or substitute guardians. First, we divided the patients into with and without RE to evaluate the differences in weekly variations of stroke occurrence. Second, we divided the same patients into with and without favorable outcome (mRS score of 0 to 2 at 3 months from the onset) to evaluate the impact of RE on outcome. Results: We screened 1,249 consecutive symptomatic ischemic stroke patients, including 385 patients (292 (76%) male, median age 67 years) with hyper-acute ischemic stroke. Of all, 251 patients (65%) were included in RE group. In the multivariate analysis, patients with RE were more likely to develop strokes on Monday compared to that on Sunday and public holiday (OR 2.841, 95% CI 1.145-7,049, p = 0.024, Figure A). In the multivariate analysis, the factors associated with favorable outcome were low NIHSS score on admission (OR 0.909, 95% CI 0.857-0.964, p = 0.001), not receiving endovascular therapy (OR 0.175 95% CI 0.069-0.444, p <0.001), and having RE (OR 2.506, 95% CI 1.049-5.986, p = 0.039, Figure B). Conclusions: There were dramatic differences in weekly variations of hyper-acute ischemic stroke occurrence between patients with and without RE. Monday seems to be “a black day” for ischemic stroke patients with RE. RE had a positive impact on outcome in hyper-acute ischemic stroke.

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Abstract TMP2: Is Eptifibatide a Viable and Safe Option as Stand-alone Therapy for Acute Ischemic Stroke Patients?

Stroke ◽

10.1161/str.47.suppl_1.tmp2 ◽

2016 ◽

Vol 47 (suppl_1) ◽

Author(s):

Daniel Korya ◽

Mohammad Moussavi ◽

Siddhart Mehta ◽

Jaskiran Brar ◽

Harina Chahal ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Time Window ◽

T Test ◽

Bleeding Complications ◽

Stroke Severity ◽

Paired Samples ◽

Group A ◽

Group B ◽

Iv Tpa

Introduction: The list of contraindications for IV tPA in acute ischemic stroke (AIS) is often too long and may lead to physicians opting to offer no treatment for certain strokes. An alternative treatment is proposed in cases where IV tPA is not an option due to time-window restrictions or contraindications. We compared the stroke severity, outcomes and safety of IV eptifibatide when compared with IV tPA. Methods: Patients who presented to a community based university affiliated comprehensive stroke center from 2012-15 with AIS over a two-year period were included in the study. Those who qualified for IV tPA, and were treated, were compared with patients who only received IV eptifibatide. The initial NIH Stroke Score (NIHSS), 24-hour NIHSS, discharge NIHSS (DCNIHSS), discharge mRS (DCmRS) and symptomatic ICH rates were compared with a paired samples t-test to determine significance of difference between the means. SPSS Version 22 was used for all data analysis. Results: A total of 864 patients presented with AIS in the evaluated time period and of those 166 met study criteria. There were 119 patients who received IV tPA alone (group A) and 47 patients received eptifibatide (group B). The mean initial NIHSS, 24-NIHSS, DCNIHSS, DCmRS and percent bleeding complications for group A were: 11.2, 10.8, 8.6, 3.1 and 6%. For group B the figures were: 6.7, 4.8, 4.3, 1.7 and 0%, respectively. Group A was compared with group B in a paired samples T-test and yielded -4.3, -6.2, -6, -1.5 (p=.0001 to .04) for initial, 24-hour, discharge NIHSS and discharge mRS, respectively. The difference between initial and discharge NIHSS between the two groups was -2.7 (p=.009), favoring IV tPA. Conclusion: In patients who are either outside the time-window or with contraindications to IV tPA, eptifibatide may be a safe alternative and appears to be efficacious. None of the patients who were started on eptifibatide had bleeding complications and they had a statistically significant improvement in their level of disability and stroke severity at discharge. A limitation of this study is that patients in group A had significantly worse initial NIHSS compared with group B. To better evaluate the efficacy of eptifibatide, a larger, prospective study should be initiated.

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Clinical profile of patients with acute ischemic stroke receiving intravenous thrombolysis (rtPA-alteplase)

International Journal of Advances in Medicine ◽

10.18203/2349-3933.ijam20180078 ◽

2018 ◽

Vol 5 (1) ◽

pp. 164

Author(s):

Shiva Prasad Jagini ◽

Suresh I.

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Prospective Observational Study ◽

Primary Outcome ◽

Intravenous Thrombolysis ◽

Clinical Profile ◽

Favorable Outcome ◽

Nihss Score ◽

The Mean ◽

Centre Hospital

Background: Stroke patients are at highest risk death in the first few weeks after the event, and between 20-50% die within first month depending on type, severity, age, co-morbidities and effectiveness of treatment of complications. Objective of this study was to clinical profile of patients with acute ischemic stroke receiving intravenous thrombolysis (rtPA-alteplase).Methods: Prospective Observational study of 26 cases of acute ischemic stroke receiving IV thrombolysis using rtPA-alteplase at Kovai Medical Centre Hospital, Coimbatore over a period of 1 year 9 months.Results: 21 cases had NIHSS score of range 10 to 22. The mean NIHSS score at admission is 13.5. 15 subjects (57.7%) had achieved primary outcome in this study. MRS Score of 0 to 2 is considered as favorable outcome. In this study 20 subjects (76.92 %) had favorable outcome at the end of 3 months.Conclusions: Majority of the patients receiving rtPA-alteplase had favorable outcome.

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Abstract TP13: Procedural Time (Groin Puncture to Recanalization) Significantly Predicts Outcomes in Endovascular Treatment: A Pooled Analysis of SWIFT, STAR and SWIFT PRIME Trials

Stroke ◽

10.1161/str.48.suppl_1.tp13 ◽

2017 ◽

Vol 48 (suppl_1) ◽

Author(s):

Ameer E Hassan ◽

Jeffrey L Saver ◽

Mayank Goyal ◽

David S Liebeskind ◽

Reza Jahan ◽

...

Keyword(s):

Ischemic Stroke ◽

Endovascular Treatment ◽

Acute Ischemic Stroke ◽

Clinical Outcomes ◽

Pooled Analysis ◽

Favorable Outcome ◽

Stroke Patients ◽

Nihss Score ◽

Post Procedure ◽

Procedural Time

Background: Recent single center studies have suggested that “procedural time” independent of “time to procedure” can affect outcomes of acute ischemic stroke patients undergoing endovascular treatment (ET). We performed a pooled analysis from three ET trials to determine the effect of procedural time on angiographic and clinical outcomes. Objective: To determine the relationship between procedural time and clinical outcomes among acute ischemic stroke patients undergoing successful recanalization with ET. Methods: We analyzed data from SWIFT, STAR and SWIFT PRIME trials. Baseline demographic and clinical characteristics, NIHSS score on admission, intracranial hemorrhage rates and mRS at 3 months post procedure were analyzed. TICI scale was used to grade post procedure angiographic recanalization. Procedural time was defined by the time interval between groin puncture and recanalization. We estimated the procedural time after which favorable clinical outcome was unlikely even after recanalization (futile) after age and NIHSS score adjustment. Results: We analyzed 301 patients who underwent ET and had near complete or complete recanalization (TICI 2b or 3). The procedural time (±SD) was significantly shorter in patients who achieved a favorable outcome (mRS 0-2) compared with those who did not achieve favorable outcome (44±25 vs 51±33 minutes, p=0.04). Table 1. In the multivariate analysis (including all baseline characteristics with a p value <0.05 as independent variables), shorter procedural time was a significant predictor of lower odds of unfavorable outcome (OR 0.49, 95% CI 0.28, 0.85, p=0.012). The rates of favorable outcomes were significantly higher when the procedural time was <60 minutes compared with ≥60 minutes (62% vs 45%, p=0.020). Conclusion: Procedural time in patients undergoing mechanical thrombectomy for acute ischemic stroke is an important determinant of favorable outcomes in those with near complete or complete recanalization.

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Abstract 3275: Early Neurological Improvement After Intravenous Thrombolysis in Acute Stroke Predicts Long-Term Functional Outcome

Stroke ◽

10.1161/str.43.suppl_1.a3275 ◽

2012 ◽

Vol 43 (suppl_1) ◽

Author(s):

Leonard L Yeo ◽

Liang Shen ◽

Ben Wakerley ◽

Aftab Ahmad ◽

Kay W Ng ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Functional Outcome ◽

Symptom Onset ◽

Functional Outcomes ◽

Treatment Time ◽

Favorable Outcome ◽

Stroke Patients ◽

Neurological Improvement ◽

Iv Tpa

Background: Intravenously administered tissue plasminogen activator (IV-TPA) remains the only approved therapeutic agent for arterial recanalization in acute ischemic stroke (AIS). Wide variations in the rates and timing of neurological recovery are observed in thrombolyzed patients. While all IV-TPA treated patients are routinely evaluated for neurological recovery at 24-hours, considerable improvement occurs in some cases within 2-hours of treatment initiation. We evaluated whether early neurological improvement at 2-hours after IV-TPA bolus (ENI-2) can predict functional outcomes in thrombolyzed AIS patients at 3-months. Methods: Data for consecutive stroke patients treated with IV-TPA within 4.5 hours of symptom-onset during 2007-2010 were prospectively entered in the thrombolyzed registry maintained at our tertiary care center. Data were collected for demographic characteristics, vascular risk factors, stroke subtypes and blood pressure levels before IV-TPA bolus. National Institute of Health Stroke Scale (NIHSS) scores were obtained before IV-TPA bolus and at 2-hours. ENI-2 was defined as a reduction in NIHSS score by more than 10-points from baseline score or an absolute score of 4-points or less at 2-hours after IV-TPA bolus. Functional outcomes at 3-months were determined by modified Rankin scale (mRS). Data were analyzed by SPSS 19.0. Results: Of the 2238 AIS patients admitted during the study period, 240 (11%) received IV-TPA within 4.5-hours of symptom-onset. Median age was 65yrs (range 19-92), 63% males, median NIHSS 17points (range 3-35) and median onset-to-treatment time 149 minutes. Overall, 122 (50.8%) patients achieved favorable functional outcome (mRS 0-1) at 3-months. Factors associated with favorable outcome at 3-months on univariable analysis were younger age, female gender, presence of atrial fibrillation, baseline NIHSS, onset-to-treatment time (OTT) and ENI-2. However, multivariable analysis demonstrated NIHSS at onset (OR per 1-point increase 0.907, 95%CI 0.848-0.969) and ENI-2 (OR 4.926 95%CI 1.66-15.15) as independent predictors of favorable outcome at 3-months. Conclusion: Early Neurological improvement at 2-hours after IV-TPA bolus is a strong predictor of the functional outcome at 3-months in acute ischemic stroke patients.

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Abstract P258: Factors Associated With Imaging Choice of Acute Ischemic Stroke Patients and the Related Health Outcomes

Circulation ◽

10.1161/circ.141.suppl_1.p258 ◽

2020 ◽

Vol 141 (Suppl_1) ◽

Author(s):

Jason J Wang ◽

Artem Boltyenkov ◽

Gabriela Martinez ◽

Jeffrey M Katz ◽

Angela Hoang ◽

...

Keyword(s):

Ischemic Stroke ◽

Health Outcomes ◽

Acute Ischemic Stroke ◽

Regression Models ◽

Critical Role ◽

Clear Understanding ◽

Negatively Associated ◽

Factors Associated ◽

To Receive ◽

Iv Tpa

Introduction: Acute ischemic stroke (AIS) presents an ongoing challenge for population health and availability of healthcare resources. Imaging plays a critical role in both diagnosis and treatment decisions in AIS, but optimal utilization regarding advanced imaging with angiography and perfusion using either CTAP or MRAP remain uncertain according to national guidelines. Consequently, wide variation in AIS imaging exists in clinical practice, mostly defaulted to physician preferences and institutional factors, without a clear understanding of the benefits and risks involved in stroke care. Although CTAP and MRAP each have unique benefits and risks in the AIS setting, the effect of this risk-benefit tradeoff on health outcomes and utilization of resources is unknown. This study analyses the factors associated with imaging preferences and the related health outcomes. Method: We performed a retrospective study on an AIS registry consisting of consecutive patients admitted to our institution from November 1, 2011, through October 1, 2018. Imaging and treatment selections and modified Rankin Score (mRS) at discharge were the main outcomes. Independent variables include age, gender, race-ethnicity, and NIH stroke score (NIHSS) at admission. Multivariable logistic regression models were performed. P<0.05 was considered statistically significant. Results: 1884 patients with curated imaging data during hospitalization were included. Among them, 32% were ≥80 years old, 47.4% female, 15.53% black, 60.3% white, and 24.4% with NIHSS≥10 at admission. CTAP and MRAP were performed in 21.1% and 72.2% patients, respectively. 46.1% received thrombolytics (IV-tPA), 1.3% had endovascular therapy (EVT), and 52.7% were not treated. The two clinical outcomes were independent functionality at discharge (mRS0-2) at 48.4%, and patients expired in hospital at 7.1%. Adjusted by all the factors, regression models showed that patients with NIHSS≥10 were more likely to receive CTAP (p<0.0001, OR=3.39) and less likely to receive MRAP (p<0.0001, OR=0.48); whereas age ≥80 was less likely to receive CTAP (p<0.0001, OR=0.37) or MRAP (p<0.0001, OR=0.37). NIHSS≥10 (p<0.0001, OR=0.15) and IV-tPA (p=0.0006, OR=0.69) were negatively related to independent functionality at discharge, and MRAP (p<0.0001, OR=1.97) was positively related to it. NIHSS≥10 (p=0.0212, OR=1.69) were positively related to mortality, while utilization of MRAP showed a negative relationship (p<0.0001, OR=0.26) with it. Conclusion: Higher NIHSS was positively associated with mortality and utilization of CTAP, while it is negatively associated with MRAP. MRAP was positively related to independent functionality at discharge. Older age was negatively associated with CTAP or MRAP utilization.

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Endovascular stroke therapy may be safe in patients with elevated international normalized ratio

Journal of NeuroInterventional Surgery ◽

10.1136/neurintsurg-2016-012757 ◽

2016 ◽

Vol 9 (12) ◽

pp. 1187-1190 ◽

Cited By ~ 14

Author(s):

Sibu Mundiyanapurath ◽

Anne Tillmann ◽

Markus Alfred Möhlenbruch ◽

Martin Bendszus ◽

Peter Arthur Ringleb

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Endovascular Therapy ◽

Tertiary Care ◽

Multivariable Analysis ◽

International Normalized Ratio ◽

Unfavorable Outcome ◽

Favorable Outcome ◽

University Hospital ◽

Increased Risk

IntroductionEndovascular therapy in acute ischemic stroke is safe and efficient. However, patients receiving oral anticoagulation were excluded in the larger trials.ObjectiveTo analyze the safety of endovascular therapy in patients with acute ischemic stroke and elevated international normalized ratio (INR) values.MethodsRetrospective database review of a tertiary care university hospital for patients with anterior circulation stroke treated with endovascular therapy. Patients with anticoagulation other than vitamin K antagonists were excluded. The primary safety endpoint was defined as symptomatic intracranial hemorrhage (sICH; ECASS II definition). The efficacy endpoint was the modified Rankin scale (mRS) score after 3 months, dichotomized into favorable outcome (mRS 0–2) and unfavorable outcome (mRS 3–6).Results435 patients were included. 90% were treated with stent retriever. 27 (6.2%) patients with an INR of 1.2–1.7 and 21 (4.8%) with an INR >1.7. 33 (7.6%) had sICH and 149 patients (34.3%) had a favorable outcome. Patients with an elevated INR did not have an increased risk for sICH or unfavorable outcome in multivariable analysis. The additional use of IV thrombolysis in patients with an INR of 1.2–1.7 did not increase the risk of sICH or unfavorable outcome. These results were replicated in a sensitivity analysis introducing an error of the INR of ±5%. They were also confirmed using other sICH definitions (Safe Implementation of Thrombolysis in Stroke (SITS), National Institute of neurological Disorders and Stroke (NINDS), Heidelberg bleeding classification).ConclusionsEndovascular therapy in patients with an elevated INR is safe and efficient. Patients with an INR of 1.2–1.7 may be treated with combined IV thrombolysis and endovascular therapy.

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Prediction of deep vein thrombosis by ultrasonography and D-dimer in Asian patients with ischemic stroke

10.21203/rs.3.rs-20274/v2 ◽

2020 ◽

Author(s):

Sang Hee Ha ◽

Yeon-Jung Kim ◽

Sung Hyuk Heo ◽

Dae-il Chang ◽

Bum joon Kim

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Stroke Patients ◽

Nihss Score ◽

Factors Associated ◽

Vein Thrombosis ◽

Asian Patients ◽

Stroke Mechanism ◽

Deep Vein ◽

D Dimer

Abstract Background: Deep vein thrombosis (DVT) is an important complication of ischemic stroke, although the incidence of DVT is regarded as being lower in Asian than in non-Asian patients. Here, we investigated the incidence and factors associated with DVT in Asian patients with ischemic stroke.Methods: Acute ischemic stroke patients received lower extremity ultrasonography (LEUS) to diagnose the presence of DVT. Clinical characteristics and laboratory results, including D-dimer level, were compared between patients with and without DVT. Independent risk factors for DVT were investigated using multivariable analysis. Similar analysis was performed to identify factors associated with elevated D-dimer level (>0.5 mg/dl) in acute ischemic stroke patients.Results: During the study period, 289 patients were enrolled, and 38 (13.1%) showed DVT. Female sex (OR=2.579, 95% CI=1.224–5.432; p=0.013) and a high National Institutes of Health Stroke Scale (NIHSS) score (OR=1.191 95% CI=1.095–1.294; p=0.005) were independently associated with the presence of DVT, although D-dimer level was not. Stroke mechanism, especially cardioembolic stroke (OR=3.777, 95% CI=1.532–9.313; p=0.004; reference: large artery atherosclerosis), NIHSS score (OR=1.087, 95% CI=1.002–1.179; p=0.001) and thrombolysis (OR=12.360, 95% CI 2.456-62.213; p=0.002) were independently associated with elevated abnormal D-dimer levels.Conclusion: The severity of ischemic stroke, but not the D-dimer level, was associated with the presence of DVT in Asian ischemic stroke patients. D-dimer level was influenced by the stroke mechanism. LEUS in patients with severe neurological deficit, rather than screening with D-dimer, may be more beneficial for diagnosing DVT in Asian patients with acute ischemic stroke.

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Abstract 2268: Trends In Reasons For Non-eligibility For tPA

Stroke ◽

10.1161/str.43.suppl_1.a2268 ◽

2012 ◽

Vol 43 (suppl_1) ◽

Author(s):

Xin Tong ◽

Mary G George

Keyword(s):

Ischemic Stroke ◽

Acute Stroke ◽

Acute Ischemic Stroke ◽

Advanced Age ◽

Stroke Patients ◽

Rapid Improvement ◽

Nihss Score ◽

Mild Stroke ◽

Over Time ◽

Iv Tpa

Background: Use of IV tPA has increased over time, as has the adherence to the NQF endorsed performance measure for receipt of IV tPA within 3 hours. Little is known about trends in the reasons for patient ineligibility for IV tPA. This study examines trends in reasons for not providing IV tPA over time and by race and gender among acute ischemic stroke patients in the Paul Coverdell National Acute Stroke Registry (PCNASR), a quality improvement program for acute stroke implemented by state health departments. Methods: There were 13,164 PCNASR patients enrolled from 2008- 2010 with a clinical diagnosis of acute ischemic stroke with documentation of LKW and who arrived within 2 hours of LKW. Cochran-Armitage tests were used to test for trend on accepted reasons for not providing IV tPA within 3 hours of time last known well (LKW). Chi-square tests were used to test for differences among reasons between men and women and between non-Hispanic whites and minorities. Multiple reasons for not giving tPA could be selected. Results: Among 13,164 acute ischemic patients admitted between 2008 and 2010 with documentation of LKW and who arrived within 2 hours of LKW, 3781 (28.7%) received IV tPA, 7284 (55.3%) had documented reasons for not receiving IV tPA, and 2099 (16.0%) did not receive IV tPA. Contraindications to IV tPA, advanced age, rapid improvement and inability to determine eligibility increased over time. Mild stroke decreased over time. Conditions with warning, advanced age, limited life expectancy and family refusal were more common in women; mild stroke and rapid improvement were more common in men. Contraindications were more common in minorities; advanced age, mild stroke and rapid improvement, and family refusal were more common in non-Hispanic whites. When advanced age was selected, 46.6% of patients were over age 90 and 3.4% were under age 80. When stroke too mild was selected, 44.8% of patients had missing NIHSS scores, 42.1% of scores were 0-4, 8.8% were 5-9, and 4.3% were ≥ 10. The three most common reasons for not providing tPA were rapid improvement (40.9%), mild stroke (33.0%), and contraindications (29.2%) in 2010. Conclusions: More than half of ischemic stroke patients arriving within 2 hours of LKW were ineligible to receive IV tPA. There was little use of advanced age for patients under age 80. Documentation of stroke too mild was not substantiated by an NIHSS score in nearly half of patients. Better documentation of NIHSS score should be provided.

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Abstract T MP52: Probabilistic Atlasing of Acute Ischemic Stroke Topology

Stroke ◽

10.1161/str.46.suppl_1.tmp52 ◽

2015 ◽

Vol 46 (suppl_1) ◽

Author(s):

Daniel Ichwan ◽

Fabien Scalzo ◽

Dezhi Liu ◽

Brandon Bergsneider ◽

Ariana Anderson ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Anatomical Variation ◽

Imaging Features ◽

Stroke Patients ◽

Nihss Score ◽

Presenting Symptoms ◽

Mri Sequences ◽

Spatio Temporal ◽

Pre Treatment

Background: Knowing which areas of the brain are most vulnerable to acute ischemic stroke can focus care on more effective, targeted therapies. By displaying lesion incidence, these susceptible regions are clearly illustrated and can be correlated with characteristics common to that population. While previous studies created DWI lesion atlases, we aimed to map the spatio-temporal topology of multi-modal MRI sequences from a large cohort of stroke patients onto a standard atlas coordinate system. Methods: Pre-treatment ADC and perfusion-weighted imaging (PWI) and post-treatment FLAIR MRI sequences for 241 acute ischemic stroke patients which were retrospectively processed. Lesion locations were circumscribed semi-automatically on the ADC and FLAIR images. Perfusion parameters were extracted from the PWI images using Bayesian hemodynamic parameter estimation. To account for anatomical variation, custom software was created to co-register the MRIs onto an atlas. Decomposing by NIHSS score items, the software then created probabilistic maps by overlaying and averaging the subgroup’s lesions and parameters within the atlas. Results: An multi-dimensional set of annotated, co-registered stroke images for ADC, PWI and FLAIR sequences was established. Incidence maps based on NIHSS score items displayed anatomic localization of presenting symptoms in various imaging modes, before and after reperfusion or other therapies (Figure). A software suite was produced that co-registers, atlases, and calculates incidence maps for any set of images. Conclusions: A framework to obtain spatial incidence maps was applied to ADC, PWI and FLAIR MRI of ischemic stroke. This instrument can co-register any annotated imaging parameters and compute lesion maps for any metric of interest. This novel atlasing method may be used to elucidate stroke etiology, predict lesion progression and identify optimal treatments based on individual imaging features at presentation.

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