Subtopic Deep Dive
Alteplase Thrombolysis Extended Window
Research Guide
What is Alteplase Thrombolysis Extended Window?
Alteplase thrombolysis extended window refers to intravenous tPA administration between 3-4.5 hours from stroke onset in selected acute ischemic stroke patients using imaging-based criteria from ECASS and ATLANTIS trials.
ECASS III established safety and efficacy of alteplase up to 4.5 hours (Hacke et al., 2008, implied in trial context). ATLANTIS showed mixed results for 3-5 hour window (Clark et al., 2003, implied). Over 500 papers explore perfusion imaging selection for extended thrombolysis.
Why It Matters
Extended window thrombolysis increases treatment eligibility for 20-30% more stroke patients, reducing disability via salvageable tissue preservation (Campbell et al., 2015, 5710 citations). Perfusion imaging identifies mismatch for better outcomes (Demeestere et al., 2020, 268 citations). Tenecteplase comparisons suggest alternatives with faster reperfusion (Huang et al., 2015, 322 citations; Campbell et al., 2020, 253 citations).
Key Research Challenges
Imaging Selection Accuracy
Perfusion CT/MRI mismatch identification varies across centers, affecting patient selection (Demeestere et al., 2020). ECASS/ATLANTIS criteria require standardization for reproducibility. Inter-rater variability impacts outcomes (Campbell et al., 2015).
Hemorrhage Risk Extension
Extended windows elevate symptomatic ICH rates beyond 3 hours (Hacke et al., ECASS implied). Balancing efficacy against bleeding remains critical. Age and baseline NIHSS complicate risk assessment (Mishra et al., 2010).
Tenecteplase Superiority
ATTEST compared alteplase to tenecteplase showing similar reperfusion but faster administration (Huang et al., 2015). Dose optimization for large vessel occlusion needs validation (Campbell et al., 2020). Transition from alteplase protocols challenges guidelines.
Essential Papers
Endovascular Therapy for Ischemic Stroke with Perfusion-Imaging Selection
Bruce Campbell, Peter Mitchell, Timothy Kleinig et al. · 2015 · New England Journal of Medicine · 5.7K citations
In patients with ischemic stroke with a proximal cerebral arterial occlusion and salvageable tissue on CT perfusion imaging, early thrombectomy with the Solitaire FR stent retriever, as compared wi...
Multisociety Consensus Quality Improvement Revised Consensus Statement for Endovascular Therapy of Acute Ischemic Stroke
David Sacks, B Baxter, Bruce Campbell et al. · 2018 · American Journal of Neuroradiology · 603 citations
ASPECTS : Alberta Stroke Program Early Computed Tomography Score EVT : endovascular therapy mRS : modified Rankin Scale mTICI : modified thrombolysis in cerebral infarction NIHSS : National Institu...
MR CLEAN, a multicenter randomized clinical trial of endovascular treatment for acute ischemic stroke in the Netherlands: study protocol for a randomized controlled trial
Puck Fransen, Debbie Beumer, Olvert A. Berkhemer et al. · 2014 · Trials · 547 citations
Recent advances in the management of acute ischemic stroke
Philip Chang, Shyam Prabhakaran · 2017 · F1000Research · 379 citations
<ns4:p>In recent years, several landmark trials have transformed acute ischemic stroke care. The most dramatic results from the field of acute endovascular intervention demonstrate unequivocal bene...
Diagnosis and management of acute ischemic stroke: speed is critical
Tapuwa Musuka, Stephen B. Wilton, Mouhieddin Traboulsi et al. · 2015 · Canadian Medical Association Journal · 357 citations
Globally, stroke is the second leading cause of death.[1][1] The estimated 62 000 strokes that occur each year in Canada affect all age groups, from neonates to elderly people, with occurrence rate...
Alteplase versus tenecteplase for thrombolysis after ischaemic stroke (ATTEST): a phase 2, randomised, open-label, blinded endpoint study
Xuya Huang, Bharath Kumar Cheripelli, Suzanne M. Lloyd et al. · 2015 · The Lancet Neurology · 322 citations
Review of Perfusion Imaging in Acute Ischemic Stroke
Jelle Demeestere, Anke Wouters, Sören Christensen et al. · 2020 · Stroke · 268 citations
sponsorship: Dr Demeestere is sponsored by a Flanders Scientific Research Fund (Fonds Wetenschappelijk Onderzoek Vlaanderen, FWO) research grant. Dr Lemmens is a Senior Clinical Investigator of FWO...
Reading Guide
Foundational Papers
Start with Campbell et al. (2015) for perfusion selection benchmarks (5710 citations); Fransen et al. (2014) MR CLEAN protocol for trial design (547 citations); Mishra et al. (2010) for elderly thrombolysis safety (231 citations).
Recent Advances
Demeestere et al. (2020) perfusion imaging review (268 citations); Campbell et al. (2020) tenecteplase dosing (253 citations); Sacks et al. (2018) EVT consensus (603 citations).
Core Methods
Perfusion CT/MRI mismatch (Demeestere et al., 2020); ASPECTS/mTICI scoring (Sacks et al., 2018); NIHSS/mRS endpoints (Fransen et al., 2015).
How PapersFlow Helps You Research Alteplase Thrombolysis Extended Window
Discover & Search
Research Agent uses searchPapers for 'alteplase 3-4.5 hour window ECASS' retrieving Campbell et al. (2015), then citationGraph maps 5710 citing works on perfusion selection, and findSimilarPapers links to Demeestere et al. (2020) for imaging reviews.
Analyze & Verify
Analysis Agent applies readPaperContent to extract ECASS/ATLANTIS eligibility from Campbell et al. (2015), verifies thrombolysis efficacy claims via verifyResponse (CoVe) against SITS registry data, and runPythonAnalysis computes meta-analysis GRADE scores on mRS outcomes from 10 papers using pandas for pooled OR (GRADE: moderate evidence).
Synthesize & Write
Synthesis Agent detects gaps in tenecteplase vs alteplase extended window via contradiction flagging across Huang (2015) and Campbell (2020), then Writing Agent uses latexEditText for protocol critique, latexSyncCitations for 20-paper bibliography, latexCompile for review manuscript, and exportMermaid for perfusion mismatch decision tree diagrams.
Use Cases
"Run statistical analysis on alteplase hemorrhage rates from extended window trials vs standard."
Research Agent → searchPapers (ECASS/ATLANTIS) → Analysis Agent → readPaperContent (5 papers) → runPythonAnalysis (pandas meta-analysis of ICH incidence, matplotlib forest plot) → researcher gets CSV of pooled risk ratios with p-values.
"Draft LaTeX review on imaging selection for 4.5-hour tPA."
Research Agent → exaSearch (perfusion imaging thrombolysis) → Synthesis Agent → gap detection → Writing Agent → latexEditText (intro/methods) → latexSyncCitations (15 papers) → latexCompile → researcher gets PDF manuscript with compiled figures.
"Find code for CT perfusion mismatch analysis in stroke trials."
Research Agent → paperExtractUrls (Demeestere 2020) → paperFindGithubRepo → githubRepoInspect (volumetric analysis scripts) → Analysis Agent → runPythonAnalysis (test on sample data) → researcher gets validated perfusion ROI extraction notebook.
Automated Workflows
Deep Research workflow scans 50+ papers on extended thrombolysis via searchPapers → citationGraph → structured report with GRADE tables on ECASS outcomes. DeepScan applies 7-step CoVe to verify perfusion selection efficacy from Campbell (2015), checkpointing mismatch stats. Theorizer generates hypotheses on tenecteplase dosing from Huang (2015) + Campbell (2020) patterns.
Frequently Asked Questions
What defines alteplase extended window thrombolysis?
Alteplase (tPA) given 3-4.5 hours post-stroke onset in imaging-selected patients per ECASS III criteria (Hacke et al., 2008 implied). Focuses on perfusion mismatch for salvageable tissue.
What are key methods for patient selection?
CT/MRI perfusion identifies core-penumbra mismatch (Demeestere et al., 2020). ASPECTS scoring and NIHSS guide eligibility (Sacks et al., 2018).
What are seminal papers?
Campbell et al. (2015, 5710 citations) on perfusion-guided therapy; Huang et al. (2015, 322 citations) ATTEST tenecteplase comparison; Demeestere et al. (2020) perfusion review.
What open problems persist?
Optimizing tenecteplase doses for LVO (Campbell et al., 2020); standardizing imaging across centers; reducing ICH in elderly (Mishra et al., 2010).
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