Platelet-rich clots as identified by Martius Scarlet Blue staining are isodense on NCCT

BackgroundCurrent studies on clot characterization in acute ischemic stroke focus on fibrin and red blood cell composition. Few studies have examined platelet composition in acute ischemic stroke clots. We characterize clot composition using the Martius Scarlet Blue stain and assess associations between platelet density and CT density.Materials and methodHistopathological analysis of the clots collected as part of the multi-institutional STRIP registry was performed using Martius Scarlet Blue stain and the composition of the clots was quantified using Orbit Image Analysis (www.orbit.bio) machine learning software. Prior to endovascular treatment, each patient underwent non-contrast CT (NCCT) and the CT density of each clot was measured. Correlations between clot components and clinical information were assessed using the χ2 test.ResultsEighty-five patients were included in the study. The mean platelet density of the clots was 15.7% (2.5–72.5%). There was a significant correlation between platelet-rich clots and the absence of hyperdensity on NCCT, (ρ=0.321, p=0.003*, n=85). Similarly, there was a significant inverse correlation between the percentage of platelets and the mean Hounsfield Units on NCCT (ρ=−0.243, p=0.025*, n=85).ConclusionMartius Scarlet Blue stain can identify patients who have platelet-rich clots. Platelet-rich clots are isodense on NCCT.

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Abstract TP249: Drip, Drive, and Retrieve - New Application of Mobile Neuro IVR Team -

Stroke ◽

10.1161/str.44.suppl_1.atp249 ◽

2013 ◽

Vol 44 (suppl_1) ◽

Author(s):

Yohei Takenobu ◽

Akira Ishii ◽

Kazumichi Yoshida ◽

Takayuki Kikuchi ◽

Mitsushige Ando ◽

...

Keyword(s):

Ischemic Stroke ◽

Subarachnoid Hemorrhage ◽

Acute Stroke ◽

Acute Ischemic Stroke ◽

Clinical Information ◽

Parent Artery ◽

Stroke Treatment ◽

Parent Artery Occlusion ◽

Aneurysm Embolization ◽

The Mean

[Background and Purpose] Neuro-interventional radiology (NIVR) is increasingly recognized as an essential option for acute stroke treatment. However, the access to NIVR physician or NIVR-capable hospital is still limited. Patient transfer system between primary stroke centers (PSCs) and comprehensive stroke centers has a problem about deterioration during transfer, insufficient information transmission, small area coverage, and loss of time. We organized a mobile NIVR team consisting of 6-7 board certified NIVR physicians, and concluded a NIVR alliance program with affiliating PSCs. The team performed procedures at the local sites on request of PSCs. [Methods] Between 2008 and 2012, we concluded a NIVR alliance program with 7 affiliated PSCs. The team dispatched NIVR physicians to the PSCs immediately after receiving "rescue call." Clinical information including medical images was updated in real-time and interactive manner during travel. [Results] We received 23 calls and reacted to all cases. We treated 8 cases of acute ischemic stroke (6 mechanical thrombectomy, 3 carotid stenting, 5 for non-responder to intravenous rt-PA), and 15 for subarachnoid hemorrhage (14 aneurysm embolization, one parent artery occlusion). The mean travel distance was 39.0 km (min - max: 6.3 - 90.3). For acute ischemic stroke, the mean "door-to-puncture time" was 154 minutes (min - max: 130 - 168). For subarachnoid hemorrhage, procedure was performed on the onset or the next day. All the procedure were successfully performed and no deterioration related to procedure were observed. [Conclusions] The new application of NIVR delivery system can safely enable to avoid deterioration during transfer, cover larger area without delay, and enlarge the opportunity to access NIVR therapy for acute stroke patients.

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Differences in Acute Ischemic Stroke Management and Prognosis between Multiple Large-Vessel Occlusion and Single Large-Vessel Occlusion: Subanalysis of the RESCUE-Japan Registry 2

Cerebrovascular Diseases ◽

10.1159/000514369 ◽

2021 ◽

Vol 50 (4) ◽

pp. 397-404

Author(s):

Kotaro Tatebayashi ◽

Kazutaka Uchida ◽

Hiroto Kageyama ◽

Hirotoshi Imamura ◽

Nobuyuki Ohara ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Patient Characteristics ◽

Large Vessel ◽

Large Vessel Occlusion ◽

Vessel Occlusion ◽

Endovascular Thrombectomy ◽

Tandem Occlusion ◽

The Mean ◽

Patient Prognosis

Introduction: The management and prognosis of acute ischemic stroke due to multiple large-vessel occlusion (LVO) (MLVO) are not well scrutinized. We therefore aimed to elucidate the differences in patient characteristics and prognosis of MLVO and single LVO (SLVO). Methods: The Recovery by Endovascular Salvage for Cerebral Ultra-Acute Embolism Japan Registry 2 (RESCUE-Japan Registry 2) enrolled 2,420 consecutive patients with acute LVO who were admitted within 24 h of onset. We compared patient prognosis between MLVO and SLVO in the favorable outcome, defined as a modified Rankin Scale (mRS) score ≤2, and in mortality at 90 days by adjusting for confounders. Additionally, we stratified MLVO patients into tandem occlusion and different territories, according to the occlusion site information and also examined their characteristics. Results: Among the 2,399 patients registered, 124 (5.2%) had MLVO. Although there was no difference between the 2 groups in terms of hypertension as a risk factor, the mean arterial pressure on admission was significantly higher in MLVO (115 vs. 107 mm Hg, p = 0.004). MLVO in different territories was more likely to be cardioembolic (42.1 vs. 10.4%, p = 0.0002), while MLVO in tandem occlusion was more likely to be atherothrombotic (39.5 vs. 81.3%, p < 0.0001). Among MLVO, tandem occlusion had a significantly longer onset-to-door time than different territories (200 vs. 95 min, p = 0.02); accordingly, the tissue plasminogen activator administration was significantly less in tandem occlusion (22.4 vs. 47.9%, p = 0.003). However, interestingly, the endovascular thrombectomy (EVT) was performed significantly more in tandem occlusion (63.2 vs. 41.7%; adjusted odds ratio [aOR], 2.3; 95% confidence interval [CI], 1.1–5.0). The type of MLVO was the only and significant factor associated with EVT performance in multivariate analysis. The favorable outcomes were obtained less in MLVO than in SLVO (28.2 vs. 37.1%; aOR, 0.48; 95% CI, 0.30–0.76). The mortality rate was not significantly different between MLVO and SLVO (8.9 vs. 11.1%, p = 0.42). Discussion/Conclusion: The prognosis of MLVO was significantly worse than that of SLVO. In different territories, we might be able to consider more aggressive EVT interventions.

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Abstract 16967: Increased Blood Pressure Variability is Associated With Worse Outcome in Acute Ischemic Stroke

Circulation ◽

10.1161/circ.132.suppl_3.16967 ◽

2015 ◽

Vol 132 (suppl_3) ◽

Author(s):

Adam de Havenon ◽

Haimei Wang ◽

Greg Stoddard ◽

Lee Chung ◽

Jennifer Majersik

Keyword(s):

Blood Pressure ◽

Logistic Regression ◽

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Blood Pressure Variability ◽

Harmful Effect ◽

Final Analysis ◽

Ordinal Logistic Regression ◽

Stroke Severity ◽

The Mean

Background: Increased blood pressure variability (BPV) is detrimental in the weeks to months after ischemic stroke, but it has not been adequately studied in the acute phase. We hypothesized that increased BPV in acute ischemic stroke (AIS) patients would be associated with worse outcome. Methods: We retrospectively reviewed inpatients at our hospital between 2010-2014 with an ICD-9 code of AIS; 213 were confirmed to have AIS by a vascular neurologist. A modified Rankin Score (mRS) after discharge was available in 148/213, at a mean of 86 ± 60 days. In 45/213 the discharge mRS was either 0 or 6, in which case they were included in the final analysis. BPV was measured as the standard deviation (SD) of each patient’s systolic blood pressure readings during the first 24 hours and 5 days of hospitalization (9,844 total readings), or until discharge if discharged in <5 days (Figure 1). The SBP SD was further divided in quartiles. A multivariate ordinal logistic regression with the outcome of mRS, the primary predictor of quartiles of SBP SD, and baseline NIH stroke scale (NIHSS) to control for initial stroke severity. Results: Mean±SD age was 64.2 ± 16.3 years, NIHSS was 12.6 ± 7.9, and mRS was 2.7 ± 2.1. The mean SBP SDs for the first 24 hours and 5 days were 12.1 ± 6.2 mm Hg and 14.1 ± 4.9 mm Hg. In the ordinal logistic regression model, the quartiles of SBP SD for the first 24 hours and 5 days were positively associated with higher mRS (OR = 1.37, 95% CI 1.01 - 1.74, p = 0.009; OR = 1.30, 95% CI 1.03 - 1.63, p = 0.028). This effect became even more pronounced in patients with the highest quartile of variability (OR = 2.76, 95% CI 1.29 - 5.88, p = 0.009; OR = 2.10, 95% CI 1.01 - 4.36, p = 0.046). Conclusion: In our cohort of 193 patients with AIS, there was a significant association between increased systolic BPV and worse functional outcome, after controlling for initial stroke severity. This data suggests that increased BPV may have a harmful effect for AIS patients, which warrants a prospective observational study.

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Abstract WP399: Reduced Cost and Decreased Length of Stay Associated with Acute Ischemic Stroke Care Provided by Nurse Practitioners: A Single Primary Stroke Center Experience

Stroke ◽

10.1161/str.48.suppl_1.wp399 ◽

2017 ◽

Vol 48 (suppl_1) ◽

Author(s):

Leah Roering ◽

Michelle Peterson ◽

Muhammad Shah Miran ◽

Melissa Freese ◽

Kenneth Shea ◽

...

Keyword(s):

Ischemic Stroke ◽

Length Of Stay ◽

Acute Ischemic Stroke ◽

Nurse Practitioners ◽

Acute Care Hospital ◽

Stroke Care ◽

Care Hospital ◽

Medical Provider ◽

The Mean ◽

Stroke Center

Background: Nurse practitioner (NP) have a wider role in modern stroke centers providing quality evidence based care to patients in both in and outpatient settings for acute ischemic stroke (AIS) and transient ischemic attack (TIA) patients. We studied the outcome measures, length of stay (LOS) and cost before and after implementation of nurse practitioners as the primary medical provider in a community based stroke center. Methods: St Cloud hospital is acute care hospital with dedicated stroke service responsible for workup and management of all patients admitted with AIS and TIA. From March 2014-March 2015, all patients were primarily managed by stroke neurologists with or without support of NP, representing physician driven arm. From June 2015-March 2016 all non-critical patients were managed primarily by NP, representing the NP driven arm of care. For this analysis, we excluded all patients with subarachnoid hemorrhage or intracerebral hemorrhage. Using ICD codes, we abstracted LOS and hospitalization cost for all patients, and compared between two arms. Results: A total of 822 patients were included in physician arm and 336 in NP arm. The mean age was 72±14 years for both arms, and 54.4% were male in physician arm and 57.4% were male in NP arm. The mean total LOS for the physician arm was 3.1 ±3.3 days while 2.9±3.6 for NP arm (p=0.6). The total cost for physician arm was $11,286.70 ±$10,920.90 while the NP arm was $10,277.30± $10,142.30 (p=0.1). Conclusion: There is a trend towards lower cost and length of stay with implementation of NP as primary stroke provider for patients admitted with acute ischemic stroke.

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Correlation of neutrophil-to-lymphocyte ratio and clinical outcome of acute thrombotic stroke in patients with COVID-19

Narra J ◽

10.52225/narra.v1i3.50 ◽

2021 ◽

Vol 1 (3) ◽

Author(s):

Rizky Sarengat ◽

Mohammad S. Islam ◽

Mohammad S. Ardhi

Keyword(s):

Ischemic Stroke ◽

Clinical Outcome ◽

Acute Ischemic Stroke ◽

National Institutes Of Health ◽

Neutrophil To Lymphocyte Ratio ◽

Stroke Patients ◽

Cross Sectional ◽

Lymphocyte Ratio ◽

Life Threatening ◽

The Mean

The coronavirus disease 2019 (COVID-19) pandemic has caused millions of deaths worldwide. Acute ischemic stroke is a life-threatening risk factor for COVID-19 infection. Neutrophil-to-lymphocyte ratio (NLR) is one of the predictors of poor prognosis in acute ischemic stroke. The aim of this study was to assess the correlation between NLR values and the clinical outcome of acute thrombotic stroke patients with COVID-19 that was measured using the National Institutes of Health Stroke Scale (NIHSS). A cross-sectional hospital-based study was conducted in Dr. Soetomo General Hospital Surabaya, Indonesia. Patients with acute thrombotic stroke and COVID-19 admitted between 1 March 2020 and 31 May 2021 were recruited. The NLR values and the NIHSS scores were assessed during the admission and the correlation between NLR and NIHSS scores was calculated. This study included 21 patients with acute thrombotic stroke and COVID-19, consisting of 12 males and 9 females. The mean age was 57.6 years old. The mean NLR values was 8.33±6.7 and the NIHSS scores ranging from 1 to 33. Our data suggested a positive correlation between NLR values and NIHSS scores, r=0.45 with p=0.041. In conclusion, the NLR value is potentially to be used as a predictor of the clinical outcome in acute thrombotic stroke patients with COVID-19. However, further study is warranted to validate this finding.

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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 P188: Transfer Time From Spoke ER Arrival to CSC Arrival in a Hub-Spoke Transfer Model of Thrombolysis for Acute Ischemic Stroke

Stroke ◽

10.1161/str.52.suppl_1.p188 ◽

2021 ◽

Vol 52 (Suppl_1) ◽

Author(s):

Vivien H Lee ◽

Paul A Segerstrom ◽

Ciarán J Powers ◽

Sharon Heaton ◽

Shahid M Nimjee ◽

...

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Univariate Analysis ◽

Transfer Model ◽

Transfer Time ◽

Intravenous Tissue Plasminogen Activator ◽

The Mean ◽

Comprehensive Stroke Center ◽

Stroke Center ◽

Er Status

Introduction: Acute ischemic stroke (AIS) patients who present to a spoke Emergency Room (ER) and require transfer to a comprehensive stroke center (CSC) hub face potential delays Methods: We performed a retrospective review of 269 suspected AIS patients who received intravenous tissue plasminogen activator (tPA) from July 2016 to October 2017 in our academic telestroke network. During this period, nearly all tPA patients were transferred to the CSC hub. Data was collected on patient demographics, National Institutes of Health Stroke Scale (NIHSS), door to needle time (DTN), and distance to CSC. ER-to-CSC was defined as the time from patient arrival at Spoke ER to arrival at CSC. Top volume ER status was assigned to the 4 Spoke ERs with the highest volume of tPA. Results: Among 269 AIS patients who received tPA at spoke ERs, the mean age was 65.4 years (range, 21 to 95), 49% were female, and 91.8% were white. The initial median NIHSS was 6 (range, 0 to 30) and the mean DTN was 73.1 minutes (range, 14 to 234). The mean distance from Spoke ER to CSC was 55.2 miles (range 5.8 to 125) and the mean ER-to-CSC was 2.6 hours (range 0.62 to 6.3) (Figure 1). In univariate analysis, the following factors were significantly associated with ER-to-CSC: distance (p < 0.0001), DTN (p < 0.0001), NIHSS (p 0.0007), and top volume ER status (p 0.0034). Patient sex, age, race, SBP, weight, initial NIHSS, daytime shift, and weekend status were not significantly associated with ER-to-CSC. Significant variables from the univariate analysis were included in multivariate linear regression model in which DTN (P < 0.0001), distance (P < 0.0001), and NIHSS (P 0.024) association with ER-to-CSC remained significant. Conclusions: In our series of AIS tPA patients transferred to CSC, the mean time from spoke ER arrival to CSC arrival was 2.6 hours. Factors associated with CSC arrival time include markers of ER performance (DTN), severity (NIHSS), and distance. Further study is warranted to improve transfer time in AIS.

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Abstract 3086: Safety of Induced Hypertension in Acute Ischemic Stroke Patients with Suboptimal Recanalization after Endovascular Thrombolysis.

Stroke ◽

10.1161/str.43.suppl_1.a3086 ◽

2012 ◽

Vol 43 (suppl_1) ◽

Author(s):

Steve M Cordina ◽

Shahram Majidi ◽

Saqib A Chaudhry ◽

Ameer E Hassan ◽

Gustavo J Rodriguez ◽

...

Keyword(s):

Ischemic Stroke ◽

Endovascular Treatment ◽

Acute Ischemic Stroke ◽

Odds Ratio ◽

Multivariate Logistic Regression Analysis ◽

Norepinephrine Infusion ◽

Induced Hypertension ◽

The Mean ◽

Poor Outcomes ◽

Similar Risk

Background: Induced hypertension is feasible, likely safe and can improve neurologic deficits in patients who are not candidates for thrombolysis. The safety of inducing hypertension in post-thrombolytic patients with suboptimal recanalization after endovascular thrombolysis is not currently known. Objective: To determine the feasibility and safety of inducing hypertension in patients in the acute post thrombolytic phase. Methods: We analyzed retrospectively collected data from a database of patients who presented with acute ischemic stroke and who received endovascular treatment with or without intravenous (IV) r-tPA . Patients with suboptimal recanalization after endovascular thrombolysis underwent induction of hypertension (systolic blood pressure [SBP] target 140-180 mmHg) for a 24 hour period after an immediate post-procedure CT scan did not demonstrate any intracerebral hemorrhage (ICH). We determined the rate of symptomatic ICH (sICH), and outcome based on modified Rankin score (mRS) at the time of discharge and compared these data to those observed in patients with non-induced hypertension and normotension. Multivariate logistic regression analysis was used to identify the odds ratio of neurological worsening and/or death after adjusting for initial National Institute of Health Stroke Scale (NIHSS) score and success of hypertension induction, which was defined as a sustained mean BP of ≥ 30% above the admission BP over the first 24 hours. Results: A total of 16 patients (12%, mean age 66) underwent post-thrombolytic induced hypertension among 138 patients who were treated with endovascular treatment. The mean age (± standard deviation [SD]) of treated patients was 68 (± 15.3) years and 52 (46%) were women. Hypertension was induced using intravenous phenylephrine or norepinephrine infusion in 9 and 7 patients, respectively. The mean (±SD) increase in SBP was 140 (±16.4) mmHg. In multivariate analysis, patients with post-thrombolytic induced hypertension had similar risk of sICH (odds ratio [OR] 0.98, 95% confidence interval [CI] 0.11-8.55) and similar discharge mRS (OR 1.85, 95% CI 0.50-6.84). Conclusion: There was no observed increase in sICH or poor outcomes associated with induced hypertension in patients with suboptimal recanalization after endovascular thrombolysis supporting safety. Further trials directed towards assessing efficacy of this approach are needed.

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Abstract 202: The NIH Stroke Scale Can Miss Improvement After IV tPA For Acute Ischemic Stroke

Circulation Cardiovascular Quality and Outcomes ◽

10.1161/circoutcomes.8.suppl_2.202 ◽

2015 ◽

Vol 8 (suppl_2) ◽

Author(s):

Elisabeth B Marsh ◽

Erin Lawrence ◽

Rafael H Llinas

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Post Treatment ◽

Functional Improvement ◽

Stroke Severity ◽

Post Discharge ◽

Significant Difference ◽

The Mean ◽

Iv Tpa

Background and Objective: The National Institute of Health Stroke Scale (NIHSS) is the most commonly used metric to evaluate stroke severity and improvement following intervention. Despite its advantages as a rapid, reproducible screening tool, it may be too insensitive to adequately capture functional improvement following treatment. We evaluated the difference in rate of improvement by previously accepted criteria (change of ≥4 NIHSS points) versus physician documentation in patients receiving IV tissue plasminogen activator (tPA) for acute ischemic stroke. Methods: Prospectively collected data on all patients receiving IV tPA over a 15 month period were retrospectively reviewed. NIHSS 24 hours post-treatment and on discharge were extrapolated based on examination and compared to NIHSS on presentation. NIHSS scores at post-discharge follow-up were also recorded. Two reviewers evaluated the medical record and determined improvement based on physician documentation. Using tests of proportion, ‘significant improvement’ by NIHSS was compared to physician documentation at each time point. Results: Forty-one patients were treated with IV tPA. The mean admission NIHSS was 8.6 and improved to 6.4 24 hours post-tPA. Twenty-nine of 41 patients (79%) were “better” by documentation; however only 11/41 (27%) met NIHSS criteria for improvement (p compared to documentation <0.001). On discharge, 20/41 patients (49%) met NIHSS criteria for improvement; however a significant difference between physician documentation remained (p=0.04). The mean post-discharge follow-up NIHSS score was 2.0. 20/21 patients (95%) were “better” compared to 16/21 (76%) meeting NIHSS criteria (p=0.08). Conclusion: The NIHSS may inadequately capture functional improvement post-treatment, especially in the days immediately following intervention.

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Clot composition of embolic strokes of undetermined source: a feasibility study

BMC Neurology ◽

10.1186/s12883-020-01969-w ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Amre Nouh ◽

Tapan Mehta ◽

Mohamed Hussain ◽

Xianyuan Song ◽

Martin Ollenschleger

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Mechanical Thrombectomy ◽

National Institutes Of Health ◽

Carotid Dissection ◽

Stroke Patients ◽

Stroke Etiology ◽

The Mean ◽

Undetermined Etiology ◽

A Prospective Study

Abstract Background A number of emerging studies have evaluated clot composition in acute ischemic stroke. Studies of clot composition of embolic strokes of undetermined strokes are lacking. Objectives We sought to analyze the RBC to platelet ratios in clots and correlated our findings with stroke etiology. Methods This was a prospective study analyzing clots retrieved by mechanical thrombectomy in acute ischemic stroke patients at our institution. All clots were stained and scanned at 200x magnification by using a Scanscope XT digital scanner (Apergio, Vista, California). Image-J software (National Institutes of Health, Bethesda, Maryland) was used for semi quantitative analysis of percentage RBC’s and platelets. Unpaired t-test was used to compare means of RBC to Platelet ratios. Correlation of RBC to Platelet ratios with stroke etiology was performed. Results A total of 33 clots from 33 patients were analyzed. Stroke etiology was undetermined in 6 patients, cardioembolic in 14, large vessel atherosclerosis (LVA) in 9, and carotid dissection in 4. The mean RBC to platelet ratio was 0.78:1 (+/− 0.65) in cardioembolic clots, 1.73:1 (+/− 2.38) in LVA and 1.4:1(+/− 0.70) in carotid dissections. Although patients with undetermined etiology had a similar clot composition to cardioembolic stroke (0.36:1+/− 0.33), (p = 0.19), it differed significantly from LVA and dissections respectively (p = 0.037, p = 0.01). Conclusion In our study, a low RBC to Platelet ratio was found among patients with embolic strokes of undetermined source, however shared similar characteristics with cardioembolic thrombi. Ongoing collection and analysis is needed to confirm these findings and its significance in evaluating stroke etiology.

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