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Automated CT Perfusion Imaging Versus Non-contrast CT for Ischemic Core Assessment in Large Vessel Occlusion

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Abstract

Purpose

There is increasing use of automated computed tomography perfusion (CTP) to aid thrombectomy decision in emergent large vessel occlusion. It is important to understand the performance of these software packages in predicting ischemic core and tissue-at-risk in the real-world setting. The aim of this study was to evaluate whether ischemic core on non-contrast CT (NCCT) and automated CTP correspond and predict infarct extent after thrombectomy for ischemic stroke.

Methods

Consecutive patients with acute anterior circulation large vessel occlusion undergoing successful thrombectomy (TICI 2b/3) were studied. All patients had baseline CT, CTP with RAPID post-processing software (RAPID-CTP), and post-thrombectomy 24 h CT. Ischemic cores were assessed by two blinded raters independently using the Alberta Stroke Program Early Computed Tomography Score (ASPECTS) on each modality. The interrater agreement for ASPECTS, and correlation between baseline CT-ASPECTS, RAPID-CTP-ASPECTS, and 24h CT-ASPECTS were calculated.

Results

A total of 86 patients with a mean age of 70.3 years (SD 16.5) were studied. The median baseline CT-ASPECTS was 9.5 (interquartile range, IQR 8–10), median RAPID-CTP-ASPECTS was 9 (IQR 8–10), and mean RAPID-CTP-ischemic core volume was 14.4 ml (SD 27.9 ml). The mean mismatch volume (difference of Tmax > 6s and cerebral blood flow (CBF) < 30%) was 128.6 ml (SD 126.0 ml). There was substantial correlation between baseline and 24h CT-ASPECTS (rs: 0.62; p < 0.001), but poor correlation between RAPID-CTP-ASPECTS and RAPID-CTP ischemic core volume with 24h NCCT-ASPECTS (rs: 0.21; p = 0.06 and −0.16; p = 0.15 respectively). The positive predictive value of any established infarct for baseline CT-ASPECTS was 81%, while that of RAPID-CTP-ASPECTS was 64%.

Conclusion

In this series of successfully revascularized patients, ischemic core as estimated by RAPID-CTP-ASPECTS did not correlate with the baseline CT and tended to depict a larger infarct core than the infarct extent as assessed by 24h CT-ASPECTS.

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Abbreviations

ASPECTS:

Alberta Stroke Program Early Computed Tomography Score

ELVO:

Emergent large vessel occlusion

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Funding

This work was supported by the Health and Medical Research Fund research fellowship scheme of Hong Kong, grant number 01150027.

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Authors and Affiliations

  1. Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, Toronto, Canada

    Anderson Chun On Tsang, Stephanie Lenck, Christopher Hilditch, Patrick Nicholson, Waleed Brinjikji, Timo Krings & Vitor M. Pereira

  2. Division of Neurosurgery, Department of Surgery, Room 701 Administrative Block, Queen Mary Hospital, The University of Hong Kong, 102 Pokfulam Road, Hong Kong, China

    Anderson Chun On Tsang

  3. Department of Neurology, Toronto Western Hospital, Toronto, Canada

    Frank L. Silver & Joanna D. Schaafsma

Authors
  1. Anderson Chun On Tsang
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  2. Stephanie Lenck
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Corresponding author

Correspondence to Anderson Chun On Tsang.

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Conflict of interest

A.C.O. Tsang, S. Lenck, C. Hilditch, P. Nicholson, W. Brinjikji, T. Krings, V.M. Pereira, F.L. Silver and J.D. Schaafsma declare that they have no competing interests.

Ethical standards

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.

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Tsang, A.C.O., Lenck, S., Hilditch, C. et al. Automated CT Perfusion Imaging Versus Non-contrast CT for Ischemic Core Assessment in Large Vessel Occlusion. Clin Neuroradiol 30, 109–114 (2020). https://doi.org/10.1007/s00062-018-0745-6

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  • DOI: https://doi.org/10.1007/s00062-018-0745-6

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