Abstract WMP16: Eloquence-Weighted Imaging Improves Clinical Outcomes Prediction in Endovascular Stroke Therapy

Background: Larger infarct size at presentation as determined by ASPECTS is associated with reduced likelihood of good outcome in acute ischemic stroke. However, infarct volume alone explains only a modest fraction (∼30%) of the variation in stroke outcome. Incorporating the relative eloquence of each ASPECTS region may improve the predictive power. Methods: In the combined database of the SWIFT and STAR trials, we identified patients treated with the Solitaire stent retriever. Using the 24hr CT scan, a multivariate linear regression was used to determine the relative contribution of each ASPECTS region, separately in each hemisphere, to freedom from disability (mRS 0-2) at 90 days. The coefficients from the regression were used to create an Eloquence-weighted ASPECTS score (EL-ASPECTS), which was compared against the original in predicting outcome based on the presentation CT scan. Results: Among 254 patients treated with ET, average age was 68, 64% were female, and NIHSS was mean 16 (SD +/- 5). Mean ASPECTS at presentation was 8.2 and 6.4 at 24 hrs. The most commonly involved ASPECTS regions were the lentiform nuclei (70%), insula (55%), and caudate (52%). In multivariate analysis, for the right hemisphere on 24hr CT, preservation of M1 (OR 1.6) and M4 (OR 1.2) regions were most strongly predictive of good outcome. For the left hemisphere on 24 hr CT, preservation of M3 (OR 2.6), and M5 (OR 2.5) and involvement of M2 (OR -1.9) were most predictive. Eloquence weights were assigned to all 20 R/L ASPECTS regions to create EL-ASPECTS. EL-ASPECTS, compared with original ASPECTS, demonstrated improved discrimination for independent functional outcome for right hemisphere (C-statistic 0.78 vs. 0.69), left hemisphere (0.78 vs. 0.72), and all stroke patients (0.76 vs. 0.70). On presentation CTs, multivariate analyses including age and presentation NIHSS demonstrated EL-ASPECTS but not original ASPECTS was predictive of good clinical outcome (OR 1.65, p<.01). Higher C-statistic values were seen with EL-ASPECTS in analysis of presentation CT scans. Conclusions: Incorporation of regional weighting into ASPECTS improves the ability to predict who will achieve independent functional outcomes with endovascular therapy in acute ischemic stroke.

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Diagnostic of psychoemotional and cognitive impairments in acute ischemic stroke

Physical and rehabilitation medicine, medical rehabilitation ◽

10.36425/rehab77964 ◽

2021 ◽

Author(s):

Anastasya . M. Tynterova

Keyword(s):

Ischemic Stroke ◽

Coping Strategies ◽

Acute Ischemic Stroke ◽

Left Hemisphere ◽

Right Hemisphere ◽

Cognitive Impairments ◽

Self Control ◽

Cerebral Hemispheres ◽

Adaptive Coping ◽

The Right

Aims: to assess the severity of cognitive, psychoemotional, behavioral disorders, the level of self-control and prevalence of certain coping strategies in patients with lesions of the right and left cerebral hemispheres after acute ischemic stroke. Materials and methods: The study included 60 patients with a diagnosis of ischemic stroke. Depending on the location of the stroke, patients were divided into two groups: Group 1 - 30 patients with lesions of the right hemisphere, Group 2 - 30 patients with lesions of the left hemisphere. The study was conducted on the 7th day of treatment and included: assessment of the cognitive status according to the Montreal scale (with additional scales for assessing the functions of the right hemisphere); assessment of the level of distress, depression, anxiety and somatization using the Four DimensionalSymptomQuestionnaire; assessment of mental and physical asthenia according to the MFI-20 scale, level of self-control using the Rotter'sLocus of Control Scale and coping strategies modality using E. Heim coping questionnaire. Results: The study established the prevalence of depression, a tendency towards non-adaptive coping strategies, ideational praxis related disorders understanding of metaphors and low level of self-control in relation to health in patients with lesions of the right hemisphere. Patients with ischemic stroke localized in the left hemisphere are characterized by a high level of mental asthenia, a choice of adaptive and relatively adaptive coping strategies, and a low level of self-control in respect to interpersonal relationships. Conclusions: The results of the study show that in the acute period of stroke there are qualitative and quantitative differences in neuropsychiatric symptoms of patients with lesions of the right and left cerebral hemispheres. The predominance of depression, cognitive impairments, and non-adaptive coping strategies in patients with lesions of the right hemisphere even with minimal or moderate motor deficits justifies early examination of the patient's behavioral, neuropsychiatric, and cognitive syndromes. The results of the study indicate the need to develop individual psychological rehabilitation programs for patients with lesions of the right and left cerebral hemispheres during the acute period of stroke.

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Regional Contributions to Poststroke Disability in Endovascular Therapy

Interventional Neurology ◽

10.1159/000492400 ◽

2018 ◽

Vol 7 (6) ◽

pp. 533-543 ◽

Cited By ~ 6

Author(s):

Sunil A. Sheth ◽

Konark Malhotra ◽

David S. Liebeskind ◽

Conrad W. Liang ◽

Albert J. Yoo ◽

...

Keyword(s):

Left Hemisphere ◽

Right Hemisphere ◽

Statistical Significance ◽

Parameter Estimates ◽

Relative Contribution ◽

C Statistic ◽

Improve Patient Selection ◽

Flow Restoration ◽

Cortical Regions ◽

The Right

Background and Purpose: The relative contribution of each Alberta Stroke Program Early CT Score (ASPECTS) region to poststroke disability likely varies across regions. Determining the relative weights of each ASPECTS region may improve patient selection for endovascular stroke therapy (EST). Methods: In the combined Solitaire Flow Restoration with the Intention for Thrombectomy (SWIFT), Solitaire Flow Restoration Thrombectomy for Acute Revascularization (STAR), and Solitaire Flow Restoration with the Intention for Thrombectomy as Primary Endovascular Treatment (SWIFT PRIME) databases, we identified patients treated with the Solitaire stent retriever. Using 24-h CT scan, a multivariate ordinal regression was used to determine the relative contribution of each ASPECTS region to clinical outcome separately in each hemisphere. The coefficients from the regression were used to create a weighted ASPECTS (wASPECTS), which was compared with the original ASPECTS to predict 90-day modified Rankin Scale disability outcomes in an independent validation cohort. Results: Among 342 patients treated with EST, the average age was 67 years, 57% were female, and the median National Institutes of Health Stroke Scale (NIHSS) score was 17 (IQR 13–20). The median ASPECTS at presentation was 8 (IQR 7–10). The most commonly involved ASPECTS regions on 24-h CT were the lentiform nuclei (70%), insula (55%), and caudate (52%). In multivariate analysis, preservation of M6 (β = 9.7) and M4 (β = 4.4) regions in the right hemisphere was most strongly predictive of good outcome. For the left hemisphere, M6 (β = 5.5), M5 (β = 4.1), and M3 (β = 3.1) generated the greatest parameter estimates, though they did not reach statistical significance. A wASPECTS incorporating all 20 parameter estimates resulted in improved discrimination against the original ASPECTS in the independent cohort (C-statistic 0.78 vs. 0.67, right hemisphere). Conclusions: For both right and left hemisphere, preservation of the high cortical regions was more strongly associated with improved outcomes compared to the deep regions. Our findings support taking into consideration the location and relative weightings of the involved ASPECTS regions when evaluating a patient for EST.

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Abstract P538: A Detailed Analysis of Intracranial Hemorrhage After Endovascular Treatment in Acute Ischemic Stroke Due to Large Vessel Occlusion in the Escape-NA1 Trial

Stroke ◽

10.1161/str.52.suppl_1.p538 ◽

2021 ◽

Vol 52 (Suppl_1) ◽

Author(s):

Johanna Ospel ◽

Michael D Hill ◽

Nima Kashani ◽

Arnuv Mayank ◽

Nishita Singh ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Intracranial Hemorrhage ◽

Intraventricular Hemorrhage ◽

Infarct Volume ◽

Prognostic Impact ◽

Vessel Occlusion ◽

Good Outcome

Purpose: We investigated the prevalence and prognostic impact on outcome of any intracranial hemorrhage, hemorrhage morphology, type and volume in acute ischemic stroke patients undergoing mechanical thrombectomy. Methods: Prevalence of intracranial hemorrhage, hemorrhage type, morphology and volume was determined on 24h follow-up imaging (non contrast head CT or gradient-echo/susceptibility-weighted MRI). Proportions of good outcome (mRS 0-2 at 90 days) were reported for patients with vs. without any intracranial hemorrhage. Multivariable logistic regression with adjustment for key minimization variables and total infarct volume was performed to obtain adjusted effect size estimates for hemorrhage type and volume on good outcome. Results: Hemorrhage on follow up-imaging was seen in 372/1097 (33.9%) patients, among them 126 (33.9%) with hemorrhagic infarction (HI) type 1, 108 (29.0%) with HI-2, 72 /19.4%) with parenchymal hematoma (PH) type 1, 37 (10.0) with PH2, 8 (2.2%) with remote PH and 21 (5.7%) with extra-parenchymal/intraventricular hemorrhage. Good outcomes were less often achieved by patients with hemorrhage on follow-up imaging (164/369 [44.4%] vs. 500/720 [69.4%]). Any type of intracranial hemorrhage was strongly associated with decreased chances of good outcome ( adj OR 0.62 [CI 95 0.44 - 0.87]). The effect of hemorrhage was driven by both PH hemorrhage sub-type [PH-1 ( adj OR 0.39 [CI 95 0.21 - 0.72]), PH-2 ( adj OR 0.15 [CI 95 0.05 - 0.50])] and extra-parenchymal/intraventricular hemorrhage ( adj OR 0.60 (0.20-1.78) Petechial hemorrhages (HI-1 and HI-2) were not associated with poorer outcomes. Hemorrhage volume ( adj OR 0.97 [CI 95 0.05 - 0.99] per ml increase) was significantly associated with decreased chances of good outcome. Conclusion: Presence of any hemorrhage on follow-up imaging was seen in one third of patients and strongly associated with decreased chances of good outcome.

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Predictors of good outcome after intravenous tPA for acute ischemic stroke

Neurology ◽

10.1212/wnl.57.3.474 ◽

2001 ◽

Vol 57 (3) ◽

pp. 474-480 ◽

Cited By ~ 116

Author(s):

A. M. Demchuk ◽

D. Tanne ◽

M. D. Hill ◽

S. E. Kasner ◽

S. Hanson ◽

...

Keyword(s):

Diabetes Mellitus ◽

Blood Pressure ◽

Ischemic Stroke ◽

Ct Scan ◽

Acute Ischemic Stroke ◽

Glucose Level ◽

The United States ◽

Baseline Serum ◽

Good Outcome ◽

History Of

Background: Thrombolytic therapy for acute ischemic stroke with IV alteplase is increasingly well established in North America but not elsewhere. Baseline factors that altered the response to alteplase were not identified by the National Institute of Neurological Disorders and Stroke tPA Stroke Study Group.Methods: The authors gathered information from centers in the United States, Canada, and Germany on 1,205 patients with acute ischemic stroke treated with IV alteplase. The purpose was to identify independent factors that were predictive of good outcome using multivariable logistic regression modelling. The modified Rankin Scale score was dichotomized into good outcome (mRS 0 to 1) and poor outcome (mRS >1) as the primary outcome measure.Results: In relative order of decreasing magnitude, milder baseline stroke severity, no history of diabetes mellitus, normal CT scan, normal pretreatment blood glucose level, and normal pretreatment blood pressure were independent predictors of good outcome among patients treated with IV alteplase for acute ischemic stroke. Confounding was observed among history of diabetes mellitus, CT scan appearance, baseline serum glucose level, and blood pressure, suggesting important relationships among these variables.Conclusions: Several factors were independently predictive of good outcome among patients with acute ischemic stroke treated with alteplase. These results require further confirmation before clinical implementation.

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Overview of The Head CT-Scan in Stroke Patients who was Treated at Muhammadiyah Hospital Palembang

Muhammadiyah Medical Journal ◽

10.24853/mmj.2.1.24-34 ◽

2021 ◽

Vol 2 (1) ◽

pp. 24

Author(s):

Pratrisna Yusastra ◽

Indriyani Indriyani ◽

Budi Utama

Keyword(s):

Ischemic Stroke ◽

Ct Scan ◽

Hemorrhagic Stroke ◽

Right Hemisphere ◽

Clinical Symptoms ◽

Neurological Deficits ◽

Thalamic Lesion ◽

Stroke Patients ◽

Head Ct ◽

The Right

Background: Stroke is a collection of symptoms of neurological deficits due to sudden acute disturbance of brain function, both focal and global, caused by blockage or rupture of arteries and veins and proven by imaging and/or reflex pathology. Using CT-Scan, the description of acute phase stroke can be easier and can determine the appropriate treatment criteria for stroke. Purposes: To determine characteristic Head CT-Scan image of stroke patients hospitalized in Muhammadiyah Palembang Hospital. Methods: This study was conducted in a retrospective descriptive manner and obtained a sample of 41 stroke patients according to the inclusion and exclusion criteria using total sampling. Result: In this study, there were 28 patients (68.2%) with ischemic stroke and 13 patients (31.7%) with hemorrhagic stroke. Head CT-Scan image of ischemic stroke shows basal ganglia lesion (28.5%) and the right hemisphere lesions (57.1%) as the most predominant area. Head CT-Scan image of hemorrhagic stroke (58.3%) had intracerebral hemorrhage with the dominant thalamic lesion area (66.6%) and the right hemisphere (58.3%) had the most lesions with 8 patients (66, 6%) had a midline shift. Stroke patients were treated as experienced by the elderly (90.2%) and were dominated by the female sex (63.4%) and are dominated by clinical symptoms of hemiparesis (29.2%). Conclusion: Stroke patients at Muhammadiyah Palembang hospital dominated by ischemic stroke and on head CT Scan image predominantly shows lesions on the right cerebral hemisphere.

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Abstract 164: Outcome Prediction After Endovascular Reperfusion Therapy For Acute Ischemic Stroke: The SNARL Score

Stroke ◽

10.1161/str.44.suppl_1.a164 ◽

2013 ◽

Vol 44 (suppl_1) ◽

Author(s):

Shyam Prabhakaran ◽

Kevin N Sheth ◽

John B Terry ◽

Raul G Nogueira ◽

Anat Horev ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Outcome Prediction ◽

Validation Cohort ◽

Reperfusion Therapy ◽

Anterior Circulation ◽

Derivation Cohort ◽

Good Outcome ◽

C Statistic ◽

Pre Treatment

Background: Tools to predict outcome after endovascular reperfusion therapy (ERT) for acute ischemic stroke (AIS) have previously included only pre-treatment variables. We sought to derive and validate an outcome prediction score based on readily available pre-treatment and treatment factors. Methods: The derivation cohort consisted of 516 patients with anterior circulation AIS from 9 centers from September 2009-July 2011. The validation cohort consisted of 110 patients with anterior circulation AIS from the Penumbra Pivotal Trial. Multivariable logistic regression identified predictors of good outcome, defined as a modified Rankin Score (mRS) of < 2, in the derivation sample; model beta coefficients were used to assign point scores. Discrimination was tested using C-statistics. We then validated the score in the Penumbra cohort and performed calibration (predicted versus observed good outcome) in both cohorts. Results: Good outcome at 3 months was noted in 189 (36.8%) patients in the derivation cohort. The independent predictors of good outcome were A ge (2 pts: <60; 1 pt: 60-79; 0 pts: >79), N IHSS score (4 pts: 0-10; 2 pts: 11-20; 0 pts: > 20), L ocation of clot (2 pts: M2; 1 pt: M1; 0 pts: ICA), R ecanalization (5 pts: TICI 2 or 3), and S ymptomatic hemorrhage (2 pts: none, HT1-2, or PH1; 0 pts: PH2). The outcome (SNARL) score demonstrated good discrimination in the derivation cohort (C-statistic 0.78, 95% CI 0.72-0.78) and validation cohort (C-statistic 0.74, 95% CI 0.64-0.84). There was excellent calibration in each cohort (Figure). Conclusions: The SNARL score is a validated tool to determine the probability of functional recovery among AIS treated with endovascular reperfusion strategies. Unlike previous scores that did not include treatment factors such as successful recanalization or hemorrhagic complications, our score can be applied to patients after treatment and may provide guidance to physicians, patients, and families about expected functional outcome.

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Abstract 127: Predictors of Good Functional Outcomes in an Acute Ischemic Stroke Cohort with a Large Infarct Core Treated with Mechanical Thrombectomy: Signals to Treat?

Stroke ◽

10.1161/str.48.suppl_1.127 ◽

2017 ◽

Vol 48 (suppl_1) ◽

Author(s):

Jeffrey Wagner ◽

Donald Frei ◽

Raul Nogueira ◽

Adnan Siddiqui ◽

Osama O Zaidat ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Functional Outcomes ◽

Mechanical Thrombectomy ◽

Infarct Volume ◽

Target Vessel ◽

Infarct Core ◽

Nihss Score ◽

Good Outcome ◽

Large Infarct

Purpose: Mechanical thrombectomy has been demonstrated to provide benefits in the treatment of acute ischemic stroke (AIS). But whether to treat AIS patients with a large infarct core remains controversial. Although it is a common practice that patients with large infarct core are not offered endovascular treatment, previous data have consistently shown a proportion of these patients may benefit from IA intervention. The purpose of this study is to identify predictors of good outcomes in an AIS cohort with a large infarct volume previously treated with mechanical thrombectomy. Hypothesis: We hypothesize that among AIS patients with a large infarct volume, younger patients (≤66 years) who present with lower NIHSS scores will show good functional outcomes (mRS 0-2) at 90 days if treated with mechanical thrombectomy. Methods: Univariable and multivariable analyses were preformed to identify factors that predict good functional outcomes in AIS patients with ASPECTS 0-5 who were treated with the Penumbra System. Five previous prospective, multicenter trials (PIVOTAL, PICS, RetroSTART, START, SEPARATOR 3D) were included in this study. Patients who presented with symptoms of AIS were analyzed for association between presenting demographics and modified Rankin scale (mRS) score at 90 days in univariate and multivariate analyses. Results: Data for 614 patients with a median age of 69 years and an NIHSS score of 18 met study criteria. Of these, the 90-day mRS 0-2 rate and mortality were, respectively, 40.23% and 25.41%. Among those with ASPECTS 0-5 (N=93), 17.20% had good functional outcome. An age of ≤66 years was significantly associated with good outcome (p<0.0001) among those with ASPECTS 0-5. Within this age group who had ASPECTS 0-5, a baseline NIHSS score of ≤ 20 (p= 0.0088) with a target vessel location at the MCA (p=0.0210) were also strong predictors of good outcome if treated by mechanical thrombectomy. Conclusion: These data demonstrate that age ≤66 years, baseline NIHSS score of ≤ 20 with a target vessel location in the MCA are important predictors of good outcomes in an AIS cohort with a large infarct core who are eligible for mechanical thrombectomy.

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The Natural History and Reperfusion Therapy Outcomes of Acute Ischemic Stroke due to Isolated M2 Occlusions

BioMed Research International ◽

10.1155/2021/6626604 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Hongmin Gong ◽

Libo Zhao ◽

Ge Tang ◽

Yu Chen ◽

Deyu Yang ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Infarct Volume ◽

Intravenous Thrombolysis ◽

Reperfusion Therapy ◽

Neurological Deficits ◽

Good Outcome ◽

Symptomatic Intracerebral Hemorrhage ◽

Efficacy Outcome ◽

The Difference

Objective. Currently, the standard treatment modality for patients with acute ischemic stroke (AIS) presenting with isolated M2 occlusions is not specific. We therefore assessed the difference in treatment outcomes for patients with isolated M2 occlusions. Methods. We retrospectively analyzed consecutive patients with AIS presenting with isolated M2 occlusions from October 1, 2018, to June 30, 2020. Patients were divided into 3 groups based on the treatments they received: no reperfusion therapy (NRT), intravenous thrombolysis treatment (IVT), and endovascular intervention (EVT), which comprised IVT in conjunction with EVT or EVT alone. The primary outcomes were improvements in modified Rankin Scale (mRS) scores at 90 days and National Institutes of Health Stroke Scale (NIHSS) scores at 24 hours after treatment compared with the baseline. The secondary efficacy outcome comprised a good outcome rate defined as a 90 − day mRS score ≤ 2 , final infarct volume (FIV), 90-day mortality rate, and successful recanalization rate, which was defined as a modified thrombolysis in cerebral infarction score ≥ 2 b . Safety outcomes included symptomatic intracerebral hemorrhage and procedure-related complications. Results. Seventy patients were enrolled and divided into 3 groups: the NRT group ( n = 25 ), IVT group ( n = 27 ), and EVT group ( n = 18 ). Twenty-four-hour posttreatment NIHSS scores were substantially decreased by EVT compared with NRT (adjusted β -4.01, 95% confidence interval [CI] -6.60 to -1.43; P = 0.003 ) or IVT (adjusted β , -3.61 [95% CI, -6.45 to -0.77]; P = 0.013 ). Compared with the outcomes observed after NRT, patients who received EVT were more likely to achieve lower 90-day mRS scores (adjusted β , -1.42 [95% CI, -2.66 to -0.63]; P = 0.007 ), higher good outcome rates (adjusted odds ratio, 8.73 [95% CI, 1.43-53.24]; P = 0.019 ), and smaller FIVs (adjusted β , -29.66 [95% CI, -59.73 to 0.42]; P = 0.048 ). The recanalization rate of EVT was high (88.89%), and procedure-related complications were rare (5.56%). Conclusions. For acute, isolated M2 occlusions, EVT could dramatically and rapidly improve neurological deficits with high safety and effectiveness. These changes were observed at 24 hours after treatment and were maintained over the long term.

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Abstract 2840: Aspect Score: DWI or CT Scan, Which One Is Better Marker For Stroke Morbidity And Outcome?

Stroke ◽

10.1161/str.43.suppl_1.a2840 ◽

2012 ◽

Vol 43 (suppl_1) ◽

Author(s):

Manoj Mittal ◽

Raymond Seet ◽

Zhang Yi ◽

Alejandro Rabinstein

Keyword(s):

Ischemic Stroke ◽

Ct Scan ◽

Acute Ischemic Stroke ◽

Predictive Value ◽

Univariate Analysis ◽

Fisher Exact Test ◽

Chi Square ◽

Exact Test ◽

Good Outcome ◽

The Difference

Background and Objective The Alberta Stroke Program Early CT Score (ASPECTS) is a validated grading system to assess ischemic changes on CT in acute ischemic stroke. Magnetic resonance imaging with diffusion weighted imaging (DWI) sequence is commonly used to identify the final ischemic changes. We examined the difference between the relationship of NIHSS at admission and ASPECT score calculated using CT scan versus MRI DWI sequence. Methods We conducted a retrospective analysis of prospectively collected data from 99 cases of acute ischemic stroke treated with IV rt-PA by time criteria, admitted to Mayo Clinic from March, 2002 through June, 2011. CT head at 24 hours and MRI DWI sequence were used to assign ASPECT score. We dichotomized ASPECTS (categorized as 0 to 7 versus 8 to 10) and favorable patient outcome at 3 month (modified Rankin score less than equal to 2 and more than 2). Univariate analysis including t-test, Chi-square, and Fisher Exact test was used when appropriate. Results Mean age was 70±14 years. Mean admission NIHSS score was 8±4. DWI ASPECTS (p<0.001) and CT ASPECTS (p=0.127) were inversely associated with admission NIHSS. Higher (8-10) CT ASPECTS (p=0.001) or DWI ASPECTS (p=0.002) were associated with good outcome (mRS ≤2) at 3 months. Sensitivity, specificity, positive predictive value and negative predictive value for good outcome identified by CT ASPECTS versus DWI ASPECTS were 81% vs 52%, 54% vs 54%, 83% vs 59% and 50% vs 47% respectively. Conclusion CT and MRI DWI are comparably useful to calculate the ASPECTS for estimation of functional outcome, but CT scan at 24 hours may be more sensitive for the prediction of good recovery.

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Abstract TP53: NIHSS and Variation of Infarct Volume by Hemisphere

Stroke ◽

10.1161/str.48.suppl_1.tp53 ◽

2017 ◽

Vol 48 (suppl_1) ◽

Author(s):

Tyler P Behymer ◽

Achala Vagal ◽

Heidi Sucharew ◽

Vineeth Yeluru ◽

Arjun Minhas ◽

...

Keyword(s):

Ischemic Stroke ◽

Left Hemisphere ◽

Right Hemisphere ◽

Infarct Volume ◽

Rank Correlation ◽

Neurological Deficits ◽

P Value ◽

Imaging Data ◽

Data Set ◽

Nihss Score

Introduction: The National Institute of Health Stroke Scale (NIHSS) is the most widely used measure of neurological deficits in clinical trials. Using the placebo arm of the NINDS t-PA Stroke Trial, it has been demonstrated that the total volume of cerebral infarction in patients with similar NIHSS scores is greater for right compared to left hemisphere strokes. Our objective was to verify this finding in a non-clinical trial, independent data set of acute ischemic strokes. Methods: The Greater Cincinnati/Northern Kentucky Stroke Study (GCNKSS) is a population-based study that tracks the incidence of stroke. A convenient subsample from the 2010 GCNKSS ischemic stroke cohort (N= 368) underwent detailed imaging analysis. Research nurses abstracted patient reords to include baseline retrospective NIHSS score. The 24 hour infarct volume was segmented using manual tracing. NIHSS was compared between left and right brain using Wilcoxon rank sum test. Spearman rank correlation determined the association between the NIHSS score and infarct volume by hemisphere. Patients were stratified by NIHSS (0 to 5, 6 to 20, and greater than 20). Results: Among 368 ischemic stroke subjects with imaging data, excluded were 77 brainstem or cerebellar infarcts, 37 undetermined volume, 1 missing NIHSS, and 3 undetermined laterality. For the remaining 250 patients, 132 were left and 118 were right hemisphere strokes, and 210 had an MRI and 40 had CT. Median time from onset to imaging was 24 hours. Baseline NIHSS was similar by hemisphere and correlated with stroke volume (r=0.38, p<0.01). The infarct volumes of right hemisphere strokes were greater than left hemisphere (p-value=0.02) (Table). Conclusion: The NIHSS score correlates with volume by hemisphere, but has a larger infarct volume for right hemisphere than left hemisphere for similar NIHSS. This likely reflects the different weighting of the NIHSS with regard to language. This finding confirms prior results in an independent dataset.

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