Evidence map›Paper›PMID 34865511›Full record

ArticleStroke2022

Machine Learning Automated Detection of Large Vessel Occlusion From Mobile Stroke Unit Computed Tomography Angiography.

Alexandra L Czap, Mersedeh Bahr-Hosseini, Noopur Singh, Jose-Miguel Yamal, May Nour, Stephanie Parker, Youngran Kim, Lucas Restrepo, Rania Abdelkhaleq, Sergio Salazar-Marioni and 7 more

Open access · bronzeAbstract read
In one paragraph

Article in Stroke, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers.

0numbers the graph read from it
0cells of the map it votes in
24citing papers in PubMed
3.9field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

24 citing papers in PubMed, 34 citations in OpenAlex.

  1. Trial
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  4. Redefining Stroke Care with Artificial Intelligence: Recent Advances.Current neurology and neuroscience reports · 2026
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  19. Prehospital stroke management and mobile stroke units.Current opinion in neurology · 2023
    Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

17 authors at 4 institutions in 1 country.

Alexandra L CzapDepartment of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).
Mersedeh Bahr-HosseiniDepartment of Neurology and Comprehensive Stroke Center, UCLA, Los Angeles, CA (M.B.-H., M.N., L.R., J.L.S.).
Noopur SinghDepartment of Biostatistics and Data Science, School of Public Health, University of Texas Health Sciences Center at Houston (N.S., J.-M.Y.).ORCID 0000-0002-8091-6072
Jose-Miguel YamalDepartment of Biostatistics and Data Science, School of Public Health, University of Texas Health Sciences Center at Houston (N.S., J.-M.Y.).
May NourDepartment of Neurology and Comprehensive Stroke Center, UCLA, Los Angeles, CA (M.B.-H., M.N., L.R., J.L.S.).
Stephanie ParkerDepartment of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).
Youngran KimDepartment of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).ORCID 0000-0002-2063-5017
Lucas RestrepoDepartment of Neurology and Comprehensive Stroke Center, UCLA, Los Angeles, CA (M.B.-H., M.N., L.R., J.L.S.).
Rania AbdelkhaleqDepartment of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).
Sergio Salazar-MarioniDepartment of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).
Kenny PhanDepartment of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).ORCID 0000-0003-4921-3608
Ritvij BowryDepartment of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).ORCID 0000-0002-2262-0855
Suja S RajanDepartment of Management, Policy and Community Health, School of Public Health, University of Texas Health Sciences Center at Houston (S.S.R.).
James C GrottaClinical Innovation and Research Institute, Memorial Hermann Hospial Texas Medical Center, Houston (J.C.G.).
Jeffrey L SaverDepartment of Neurology and Comprehensive Stroke Center, UCLA, Los Angeles, CA (M.B.-H., M.N., L.R., J.L.S.).
Luca Giancardo *Center for Precision Health, UTHealth School of Biomedical Informatics, UTHealth McGovern Medical School, Houston, TX (L.G.).ORCID 0000-0002-4862-2277
Sunil A Sheth *Department of Neurology, UTHealth McGovern Medical School, Houston TX (A.L.C., S.P., Y.K., R.A., S.S.-M., K.P., R.B., S.A.S.).ORCID 0000-0003-0602-8509
The University of Texas Health Science Center · USUCLA Health · USThe University of Texas Health Science Center at Houston · USMemorial Hermann · US

Funding

Deep Learning Enabled Endovascular Stroke Therapy Screening in Community HospitalsR01NS121154 · NINDS · UNIVERSITY OF TEXAS HLTH SCI CTR HOUSTON · PI GIANCARDO, LUCA, SHETH, SUNIL · 2021 to 2025
$2.2M
NINDS NIH HHS R01 NS121154
6 · The paper itself

Abstract

backgroundPrehospital automated large vessel occlusion (LVO) detection in Mobile Stroke Units (MSUs) could accelerate identification and treatment of patients with LVO acute ischemic stroke. Here, we evaluate the performance of a machine learning (ML) model on CT angiograms (CTAs) obtained from 2 MSUs to detect LVO.

methodsPatients evaluated on MSUs in Houston and Los Angeles with out-of-hospital CTAs were identified. Anterior circulation LVO was defined as an occlusion of the intracranial internal carotid artery, middle cerebral artery (M1 or M2), or anterior cerebral artery vessels and determined by an expert human reader. A ML model to detect LVO was trained and tested on independent data sets consisting of in-hospital CTAs and then tested on MSU CTA images. Model performance was determined using area under the receiver-operator curve statistics.

resultsAmong 68 patients with out-of-hospital MSU CTAs, 40% had an LVO. The most common occlusion location was the middle cerebral artery M1 segment (59%), followed by the internal carotid artery (30%), and middle cerebral artery M2 (11%). Median time from last known well to CTA imaging was 88.0 (interquartile range, 59.5-196.0) minutes. After training on 870 in-hospital CTAs, the ML model performed well in identifying LVO in a separate in-hospital data set of 441 images with area under receiver-operator curve of 0.84 (95% CI, 0.80-0.87). ML algorithm analysis time was under 1 minute. The performance of the ML model on the MSU CTA images was comparable with area under receiver-operator curve 0.80 (95% CI, 0.71-0.89). There was no significant difference in performance between the Houston and Los Angeles MSU CTA cohorts.

conclusionsIn this study of patients evaluated on MSUs in 2 cities, a ML algorithm was able to accurately and rapidly detect LVO using prehospital CTA acquisitions.

Indexed as

Ischemic StrokeStrokeAngiographyComputed Tomography AngiographyHumansMachine LearningTomography, X-Ray Computed

Identifiers

PMID34865511
PMCPMC9038611
OpenAlexW4200575763

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.