Volume 35, Issue 2 e70030
REVIEW ARTICLE

Intraarterial Thrombolysis as an Adjunct to Thrombectomy in Acute Ischemic Stroke: Current Status and Future Prospects

Adnan I. Qureshi

Adnan I. Qureshi

Zeenat Qureshi Stroke Institutes, Columbia, Missouri, USA

Department of Neurology, University of Missouri, Columbia, Missouri, USA

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Mohammed M. Al-Salihi

Mohammed M. Al-Salihi

Zeenat Qureshi Stroke Institutes, Columbia, Missouri, USA

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Ibrahim A. Bhatti

Corresponding Author

Ibrahim A. Bhatti

Zeenat Qureshi Stroke Institutes, Columbia, Missouri, USA

Department of Neurology, University of Missouri, Columbia, Missouri, USA

Correspondence: Ibrahim A. Bhatti ([email protected])

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Maryam S. Al-Jebur

Maryam S. Al-Jebur

College of Medicine, University of Baghdad, Baghdad, Iraq

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Ahmed Abd Elazim

Ahmed Abd Elazim

Department of Neurology, University of South Dakota, Sioux Falls, South Dakota, USA

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Sameer A. Ansari

Sameer A. Ansari

Department of Radiology, Northwestern Medicine, Chicago, Illinois, USA

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Daniel E. Ford

Daniel E. Ford

Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA

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Daniel F. Hanley

Daniel F. Hanley

Department of Neurology, Johns Hopkins University, Baltimore, Maryland, USA

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Ameer E. Hassan

Ameer E. Hassan

Department of Neurology, Valley Baptist-University of Texas Rio Grande Valley, Harlingen, Texas, USA

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Pashmeen Lakhani

Pashmeen Lakhani

Zeenat Qureshi Stroke Institutes, Columbia, Missouri, USA

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David R. Mehr

David R. Mehr

Department of Family and Community Medicine, University of Missouri, Columbia, Missouri, USA

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Thanh N. Nguyen

Thanh N. Nguyen

Department of Neurology, Boston University Chobanian and Avedisian School of Medicine, Boston, Massachusetts, USA

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Alejandro M. Spiotta

Alejandro M. Spiotta

Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA

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William J. Powers

William J. Powers

Department of Neurology, Duke University School of Medicine, Durham, North Carolina, USA

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Syed F. Zaidi

Syed F. Zaidi

Department of Neurology, University of Toledo, Toledo, Ohio, USA

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First published: 17 March 2025
Citations: 1

Funding: The authors received no specific funding for this work.

ABSTRACT

Background and Purpose

Intraarterial thrombolysis (IAT) has been sporadically used as an adjunct to mechanical thrombectomy (MT) in acute ischemic stroke patients for nearly two decades to improve distal arterial and microvascular perfusion even in patients with near complete or complete recanalization.

Methods

We provide an overall narrative review that includes a systematic review and meta-analysis of two randomized controlled trials (RCTs), Chemical Optimization of Cerebral Embolectomy and Endovascular Recanalization in Patients with Acute Posterior Circulation Arterial Occlusion, to identify current and future implications. Risk ratios (RRs) were calculated from RCTs using a fixed-effects model. We identified 10 ongoing or planned RCTs after a search on clinicaltrials.gov and other sources, of which eight are in China, one in Europe, and one in Australia.

Results

A previous meta-analysis of 16 (predominantly observational) studies involving 7572 MT-treated patients had identified 14% higher odds of functional independence (modified Rankin scale [mRS] 0–2) at 90 days in patients treated with IAT. In the current analysis of 321 patients who underwent MT in RCTs, 165 were randomized to IAT and 156 were in the control group. The RR of achieving an mRS score of 0–1 at 90 days postrandomization was higher in patients treated with IAT compared with the control group (absolute increase of 12.87%, RR = 1.39, 95% confidence interval [CI] 1.04–1.86). The rate of symptomatic intracerebral hemorrhage (sICH) within 24 h was slightly higher (absolute increase of 1.64%, RR = 0.95, 95% CI 0.07–13.30) in patients treated with IAT. The ongoing RCTs have sample sizes ranging from 80 to 498 that can identify very large minimal clinically important differences (MCIDs) (13%–20% increase) in primary outcomes, but smaller MCIDs (<10%) that can still result in practice changes with interventions associated with low cost and complexity and are easy to implement, such as IAT, will not be identified.

Conclusions

Observational studies and recent RCTs suggest a potential benefit of IAT in improving functional outcomes among patients post-MT, although the potentially increased risk of sICH, inadequate sample sizes, and lack of data from the United States need to be considered. A large, definitive, and generalizable RCT is required to establish the therapeutic value and safety profile of IAT prior to widespread incorporation into routine practice.

Conflicts of Interest

Dr. Qureshi is confounder of Qureshi Medical LLC, QureVasc LLC, and DyQure LLC. Dr. Qureshi also holds a patent on intraarterial sustained release device in the middle meningeal artery. Thanh N. Nguyen is the Associate Editor of Stroke journal and serves on the advisory board for Brainomix and Aruna Bio. The other authors declare no conflicts of interest.

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