The impact of CT perfusion threshold on predicted viable and nonviable tissue volumes in acute ischaemic stroke

Huang, X., Kalladka, D., Cheripelli, B. K., Moreton, F. C. and Muir, K. W. (2017) The impact of CT perfusion threshold on predicted viable and nonviable tissue volumes in acute ischaemic stroke. Journal of Neuroimaging, 27(6), pp. 602-606. (doi:10.1111/jon.12442) (PMID:28414895)

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Abstract

Background and Purpose: Perfusion imaging is used for patient selection in clinical practice and trials. Postprocessing and definitions of tissue viability are nevertheless not standardized. We compared the lesion volumes generated with two well-recognized perfusion tissue definitions in a single-center phase 2 thrombolysis study. Methods: We analyzed perfusion imaging data from the Alteplase-Tenecteplase Trial Evaluation for Stroke Thrombolysis (ATTEST) study using two popular tissue viability thresholds (ischemic core definition: (1) cerebral blood volume < 2.0 mL/100 g−1 or (2) relative cerebral blood flow < 40% that of the contralesional hemisphere and relative delay time >2 seconds; penumbra definitions: (1) mean transit time > 145% of contralesional hemisphere or (2) relative delay time < 2 seconds). We compared volumes of core and penumbra, mismatch ratio, percentage, and volume of penumbra salvaged at 24 hours. Results: We included 73 (tenecteplase = 36, alteplase = 37) patients who had analyzable perfusion lesions at baseline. Significant differences were found in core volumes using the two thresholds (33 ± 37 mL vs. 26 ± 32 mL, P < .001), as was mismatch ratio (2.5 ± .9 vs. 4.2 ± 3.7, P < 0.001). The volume of penumbra salvaged at 24 hours (30 ± 19 mL vs. 35 ± 26 mL, P = .043) differed significantly, although the percentages of penumbra salvaged did not (P= .2). No difference was found between the two thrombolytic agents in the percentages of penumbra salvaged using either threshold. Conclusion: Two commonly used tissue definitions generated significantly different lesion volumes and mismatch ratios. Threshold selection may have significant impact on patient selection for trials or reperfusion therapies.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cheripelli, Dr Bharath Kumar and Huang, Dr Xuya and Muir, Professor Keith and Kalladka, Dr Dheeraj and Moreton, Dr Fiona
Authors: Huang, X., Kalladka, D., Cheripelli, B. K., Moreton, F. C., and Muir, K. W.
College/School:College of Medical Veterinary and Life Sciences > Institute of Neuroscience and Psychology
Journal Name:Journal of Neuroimaging
Publisher:Wiley
ISSN:1051-2284
ISSN (Online):1552-6569
Published Online:17 April 2017
Copyright Holders:Copyright © 2017 The American Society of Neuroimaging
First Published:First published in Journal of Neuroimaging 27(6): 602-606
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
542331ATTEST: Pilot trial of Tenecteplase for Acute Ischaemic StrokeKeith MuirThe Stroke Association (CHSA)TSA2010/04RI NEUROSCIENCE & PSYCHOLOGY