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Fainardi E, Busto G, Morotti A. Automated advanced imaging in acute ischemic stroke. Certainties and uncertainties. Eur J Radiol Open 2023; 11:100524. [PMID: 37771657 PMCID: PMC10523426 DOI: 10.1016/j.ejro.2023.100524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 09/12/2023] [Accepted: 09/13/2023] [Indexed: 09/30/2023] Open
Abstract
The purpose of this is study was to review pearls and pitfalls of advanced imaging, such as computed tomography perfusion and diffusion-weighed imaging and perfusion-weighted imaging in the selection of acute ischemic stroke (AIS) patients suitable for endovascular treatment (EVT) in the late time window (6-24 h from symptom onset). Advanced imaging can quantify infarct core and ischemic penumbra using specific threshold values and provides optimal selection parameters, collectively called target mismatch. More precisely, target mismatch criteria consist of core volume and/or penumbra volume and mismatch ratio (the ratio between total hypoperfusion and core volumes) with precise cut-off values. The parameters of target mismatch are automatically calculated with dedicated software packages that allow a quick and standardized interpretation of advanced imaging. However, this approach has several limitations leading to a misclassification of core and penumbra volumes. In fact, automatic software platforms are affected by technical artifacts and are not interchangeable due to a remarkable vendor-dependent variability, resulting in different estimate of target mismatch parameters. In addition, advanced imaging is not completely accurate in detecting infarct core, that can be under- or overestimated. Finally, the selection of candidates for EVT remains currently suboptimal due to the high rates of futile reperfusion and overselection caused by the use of very stringent inclusion criteria. For these reasons, some investigators recently proposed to replace advanced with conventional imaging in the selection for EVT, after the demonstration that non-contrast CT ASPECTS and computed tomography angiography collateral evaluation are not inferior to advanced images in predicting outcome in AIS patients treated with EVT. However, other authors confirmed that CTP and PWI/DWI postprocessed images are superior to conventional imaging in establishing the eligibility of patients for EVT. Therefore, the routine application of automatic assessment of advanced imaging remains a matter of debate. Recent findings suggest that the combination of conventional and advanced imaging might improving our selection criteria.
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Affiliation(s)
- Enrico Fainardi
- Neuroradiology Unit, Department of Experimental and Clinical Biomedical Sciences, University of Florence, Italy
- Neuroradiology Unit, Department of Radiology, Careggi University Hospital, Florence, Italy
| | - Giorgio Busto
- Neuroradiology Unit, Department of Radiology, Careggi University Hospital, Florence, Italy
| | - Andrea Morotti
- Department of Neurological and Vision Sciences, Neurology Unit, ASST Spedali Civili, Brescia, Italy
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2
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Thirugnanachandran T, Aitchison SG, Lim A, Ding C, Ma H, Phan T. Assessing the diagnostic accuracy of CT perfusion: a systematic review. Front Neurol 2023; 14:1255526. [PMID: 37885475 PMCID: PMC10598661 DOI: 10.3389/fneur.2023.1255526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 09/15/2023] [Indexed: 10/28/2023] Open
Abstract
Background and purpose Computed tomography perfusion (CTP) has successfully extended the time window for reperfusion therapies in ischemic stroke. However, the published perfusion parameters and thresholds vary between studies. Using Preferred Reporting Items for Systematic Reviews and Meta-Analyses of Diagnostic Test Accuracy Studies (PRISMA-DTA) guidelines, we conducted a systematic review to investigate the accuracy of parameters and thresholds for identifying core and penumbra in adult stroke patients. Methods We searched Medline, Embase, the Cochrane Library, and reference lists of manuscripts up to April 2022 using the following terms "computed tomography perfusion," "stroke," "infarct," and "penumbra." Studies were included if they reported perfusion thresholds and undertook co-registration of CTP to reference standards. The quality of studies was assessed using the Quality Assessment of Diagnostic Accuracy Studies-2 (QUADAS-2) tool and Standards for Reporting of Diagnostic Accuracy (STARD) guidelines. Results A total of 24 studies were included. A meta-analysis could not be performed due to insufficient data and significant heterogeneity in the study design. When reported, the mean age was 70.2 years (SD+/-3.69), and the median NIHSS on admission was 15 (IQR 13-17). The perfusion parameter identified for the core was relative cerebral blood flow (rCBF), with a median threshold of <30% (IQR 30, 40%). However, later studies reported lower thresholds in the early time window with rapid reperfusion (median 25%, IQR 20, 30%). A total of 15 studies defined a single threshold for all brain regions irrespective of collaterals and the gray and white matter. Conclusion A single threshold and parameter may not always accurately differentiate penumbra from core and oligemia. Further refinement of parameters is needed in the current era of reperfusion therapy.
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Affiliation(s)
| | | | | | | | | | - Thanh Phan
- Stroke and Ageing Research (STAR), Department of Medicine, School of Clinical Sciences at Monash Health, Monash University, Clayton, VIC, Australia
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3
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Ballout AA, Oh SY, Huang B, Patsalides A, Libman RB. Ghost infarct core: A systematic review of the frequency, magnitude, and variables of CT perfusion overestimation. J Neuroimaging 2023; 33:716-724. [PMID: 37248074 DOI: 10.1111/jon.13127] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 05/16/2023] [Accepted: 05/18/2023] [Indexed: 05/31/2023] Open
Abstract
BACKGROUND AND PURPOSE CT perfusion (CTP) imaging is now widely used to select patients with large vessel occlusions for mechanical thrombectomy. Ghost infarct core (GIC) phenomenon has been coined to describe CTP core overestimation and has been investigated in several retrospective studies. Our aim is to review the frequency, magnitude, and variables associated with this phenomenon. METHODS A primary literature search resulted in eight studies documenting median time from symptom onset to CTP, median estimated core size, median final infarct volume, median core overestimation of the GIC population, recanalization rates, good outcomes, and collateral status for this systematic review. RESULTS All the studies investigated patients who underwent CTP within 6 hours of symptom onset, ranging from median times of 105 to 309 minutes. The frequency of core overestimation varied from 6% to 58.4%, while the median estimated ischemic core and final infarction volume ranged from 7 to 27 mL and 12 to 31 mL, respectively. The median core overestimation ranged from 3.6 to 30 mL with upper quartile ranges up to 58 mL. GIC was found to be a highly time-and-collateral-dependent process that increases in frequency and magnitude as the time from symptom onset to imaging decreases and in the presence of poor collaterals. CONCLUSIONS CTP ischemic core overestimation appears to be a relatively common phenomenon that is most frequent in patients with poor collaterals imaged within the acute time window. Early perfusion imaging should be interpreted with caution to prevent the inadvertent exclusion of patients from highly effective reperfusion therapies.
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Affiliation(s)
- Ahmad A Ballout
- Department of Neurology, Zucker School of Medicine at Hofstra/Northwell, Manhasset, New York, USA
| | - Seok Yoon Oh
- Department of Neurology, Zucker School of Medicine at Hofstra/Northwell, Manhasset, New York, USA
| | - Brendan Huang
- Department of Neurology, Zucker School of Medicine at Hofstra/Northwell, Manhasset, New York, USA
| | - Athos Patsalides
- Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Manhasset, New York, USA
| | - Richard B Libman
- Department of Neurology, Zucker School of Medicine at Hofstra/Northwell, Manhasset, New York, USA
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Nakagawa I, Kotsugi M, Yokoyama S, Maeoka R, Takeshima Y, Matsuda R, Yamada S, Nakase H. Parenchymal Blood Volume Changes Immediately After Endovascular Thrombectomy Predict Futile Recanalization in Patients with Emergent Large Vessel Occlusion. World Neurosurg 2023; 176:e711-e718. [PMID: 37295462 DOI: 10.1016/j.wneu.2023.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/12/2023]
Abstract
OBJECTIVE More than one third of acute ischemic stroke (AIS) patients do not recover to functional independence even if endovascular thrombectomy (EVT) is performed rapidly and successfully. This suggests that angiographic recanalization does not necessarily lead to tissue reperfusion. Although recognition of reperfusion status after EVT is pivotal for optimal postoperative management, reperfusion imaging assessment immediately after recanalization has not been fully investigated. The present study aimed to evaluate whether reperfusion status based on parenchymal blood volume (PBV) assessment after angiographic recanalization influences infarct growth and functional outcome in patients who have undergone EVT following AIS. METHODS Seventy-nine patients who underwent successful EVT for AIS were retrospectively analyzed. PBV maps were acquired from flat-panel detector computed tomography (CT) perfusion images before and after angiographic recanalization. Reperfusion status was assessed from PBV values and their changes in regions of interest and collateral score. RESULTS Post-EVT PBV ratio and ΔPBV ratio, as PBV parameters indicating the degree of reperfusion, were significantly lower in the unfavorable prognosis group (P < 0.01 each). Poor reperfusion on PBV mapping was associated with significantly longer puncture-to-recanalization time, lower collateral score, and higher frequency of infarct growth. Logistic regression analysis identified low collateral score and low ΔPBV ratio as associated with poor prognosis after EVT (odds ratios, 2.48, 3.72; 95% confidence intervals, 1.06-5.81, 1.20-11.53; P = 0.04, 0.02, respectively). CONCLUSIONS Poor reperfusion in severely hypoperfused territories on PBV mapping immediately after recanalization may predict infarct growth and unfavorable prognosis in patients who undergo EVT following AIS.
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Affiliation(s)
- Ichiro Nakagawa
- Department of Neurosurgery, Nara Medical University, Nara, Japan.
| | - Masashi Kotsugi
- Department of Neurosurgery, Nara Medical University, Nara, Japan
| | - Shohei Yokoyama
- Department of Neurosurgery, Nara Medical University, Nara, Japan
| | - Ryosuke Maeoka
- Department of Neurosurgery, Nara Medical University, Nara, Japan
| | | | - Ryosuke Matsuda
- Department of Neurosurgery, Nara Medical University, Nara, Japan
| | - Shuichi Yamada
- Department of Neurosurgery, Nara Medical University, Nara, Japan
| | - Hiroyuki Nakase
- Department of Neurosurgery, Nara Medical University, Nara, Japan
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5
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Hoving JW, van Voorst H, Peerlings D, Daems JD, Koopman MS, Wouters A, Kappelhof M, LeCouffe NE, Treurniet KM, Bruggeman AAE, Rinkel LA, van den Wijngaard IR, Coutinho JM, van der Lugt A, Marquering HA, Roos YBWEM, Majoie CBLM, Emmer BJ. Association between computed tomography perfusion and the effect of intravenous alteplase prior to endovascular treatment in acute ischemic stroke. Neuroradiology 2023; 65:1053-1061. [PMID: 36884080 PMCID: PMC10169898 DOI: 10.1007/s00234-023-03139-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 03/01/2023] [Indexed: 03/09/2023]
Abstract
PURPOSE Intravenous alteplase (IVT) prior to endovascular treatment (EVT) is neither superior nor noninferior to EVT alone in acute ischemic stroke patients. We aim to assess whether the effect of IVT prior to EVT differs according to CT perfusion (CTP)-based imaging parameters. METHODS In this retrospective post hoc analysis, we included patients from the MR CLEAN-NO IV with available CTP data. CTP data were processed using syngo.via (version VB40). We performed multivariable logistic regression to obtain the effect size estimates (adjusted common odds ratio a[c]OR) on 90-day functional outcome (modified Rankin Scale [mRS]) and functional independence (mRS 0-2) for CTP parameters with two-way multiplicative interaction terms between IVT administration and the studied parameters. RESULTS In 227 patients, median CTP-estimated core volume was 13 (IQR 5-35) mL. The treatment effect of IVT prior to EVT on outcome was not altered by CTP-estimated ischemic core volume, penumbral volume, mismatch ratio, and presence of a target mismatch profile. None of the CTP parameters was significantly associated with functional outcome after adjusting for confounders. CONCLUSION In directly admitted patients with limited CTP-estimated ischemic core volumes who presented within 4.5 h after symptom onset, CTP parameters did not statistically significantly alter the treatment effect of IVT prior to EVT. Further studies are needed to confirm these results in patients with larger core volumes and more unfavorable baseline perfusion profiles on CTP imaging.
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Affiliation(s)
- Jan W Hoving
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands. .,Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, location University of Amsterdam, Office G1-229, Meibergdreef 9, 1105 AZ, Amsterdam, the Netherlands.
| | - Henk van Voorst
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands.,Department of Biomedical Engineering and Physics, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands
| | - Daan Peerlings
- Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Jasper D Daems
- Department of Public Health, Erasmus University Medical Center, Rotterdam, the Netherlands.,Department of Neurology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Miou S Koopman
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands
| | - Anke Wouters
- Department of Neurology, Amsterdam University Medical Centers, location University of Amsterdam, Amsterdam, the Netherlands
| | - Manon Kappelhof
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands
| | - Natalie E LeCouffe
- Department of Neurology, Amsterdam University Medical Centers, location University of Amsterdam, Amsterdam, the Netherlands
| | - Kilian M Treurniet
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands.,Department of Radiology, The Hague Medical Center, The Hague, the Netherlands
| | - Agnetha A E Bruggeman
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands
| | - Leon A Rinkel
- Department of Neurology, Amsterdam University Medical Centers, location University of Amsterdam, Amsterdam, the Netherlands
| | | | - Jonathan M Coutinho
- Department of Neurology, Amsterdam University Medical Centers, location University of Amsterdam, Amsterdam, the Netherlands
| | - Aad van der Lugt
- Department of Radiology, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Henk A Marquering
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands.,Department of Biomedical Engineering and Physics, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands
| | - Yvo B W E M Roos
- Department of Neurology, Amsterdam University Medical Centers, location University of Amsterdam, Amsterdam, the Netherlands
| | - Charles B L M Majoie
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands
| | - Bart J Emmer
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, the Netherlands
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Wang J, Qiu J, Wang Y. Neurological Functional Independence After Endovascular Thrombectomy and Different Imaging Modalities for Large Infarct Core Assessment : A Systematic Review and Meta-analysis. Clin Neuroradiol 2023; 33:21-9. [PMID: 35920865 DOI: 10.1007/s00062-022-01202-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 07/10/2022] [Indexed: 11/03/2022]
Abstract
PURPOSE To investigate the rate of neurological functional independence (NFI) at 90 days in patients with large infarct core (LIC), which was evaluated by different imaging modalities before endovascular thrombectomy (EVT). METHODS PubMed and EMBASE were searched for original studies on clinical functional outcomes at 90 days in LIC patients who received EVT treatment from inception to 28 September 2021. The pooled NFI rates were calculated using random effects model according to different imaging modalities and criteria. RESULTS We included 34 studies enrolling 2997 LIC patients. The NFI rates were 23% (95% confidence interval, CI 15-32%) and 24% (95% CI 10-38%) when LIC was defined as core volume ≥50 ml and ≥ 70 ml separately on computed tomography perfusion, 36% (95% CI 23-48%) and 21% (95% CI 17-25%) when LIC was defined as core volume ≥ 50 ml and ≥ 70 ml separately on magnetic resonance diffusion-weighted imaging (DWI), 28% (95% CI 24-32%) and 37% (95% CI 21-53%) when LIC was defined as DWI-ASPECTS ≤ 5 and ≤ 6 separately, 23% (95% CI 19-27%) and 32% (95% CI 18-46%) when LIC was defined as NCCT-ASPECTS ≤ 5 and ≤ 6 separately. CONCLUSION Similar NFI rates could be obtained after EVT in LIC patients if proper LIC criteria were select according to the imaging modality.
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7
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Lacidogna G, Pitocchi F, Mascolo AP, Marrama F, D’Agostino F, Rocco A, Mori F, Maestrini I, Sabuzi F, Cavallo A, Morosetti D, Garaci F, Di Giuliano F, Floris R, Sallustio F, Diomedi M, Da Ros V. CT Perfusion as a Predictor of the Final Infarct Volume in Patients with Tandem Occlusion. J Pers Med 2023; 13:jpm13020342. [PMID: 36836576 PMCID: PMC9964425 DOI: 10.3390/jpm13020342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/01/2023] [Accepted: 02/08/2023] [Indexed: 02/18/2023] Open
Abstract
BACKGROUND CT perfusion (CTP) is used in patients with anterior circulation acute ischemic stroke (AIS) for predicting the final infarct volume (FIV). Tandem occlusion (TO), involving both intracranial large vessels and the ipsilateral cervical internal carotid artery could generate hemodynamic changes altering perfusion parameters. Our aim is to evaluate the accuracy of CTP in the prediction of the FIV in TOs. METHODS consecutive patients with AIS due to middle cerebral artery occlusion, referred to a tertiary stroke center between March 2019 and January 2021, with an automated CTP and successful recanalization (mTICI = 2b - 3) after endovascular treatment were retrospectively included in the tandem group (TG) or in the control group (CG). Patients with parenchymal hematoma type 2, according to ECASS II classification of hemorrhagic transformations, were excluded in a secondary analysis. Demographic, clinical, radiological, time intervals, safety, and outcome measures were collected. RESULTS among 319 patients analyzed, a comparison between the TG (N = 22) and CG (n = 37) revealed similar cerebral blood flow (CBF) > 30% (29.50 ± 32.33 vs. 15.76 ± 20.93 p = 0.18) and FIV (54.67 ± 65.73 vs. 55.14 ± 64.64 p = 0.875). Predicted ischemic core (PIC) and FIV correlated in both TG (tau = 0.761, p < 0.001) and CG (tau = 0.315, p = 0.029). The Bland-Altmann plot showed agreement between PIC and FIV for both groups, mainly in the secondary analysis. CONCLUSION automated CTP could represent a good predictor of FIV in patients with AIS due to TO.
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Affiliation(s)
- Giordano Lacidogna
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
- Correspondence: ; Tel.: +39-0620903423
| | - Francesca Pitocchi
- Diagnostic Imaging Unit, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
| | - Alfredo Paolo Mascolo
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Federico Marrama
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Federica D’Agostino
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Alessandro Rocco
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Francesco Mori
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Ilaria Maestrini
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Federico Sabuzi
- Interventional Radiology Unit, Department of Biomedicine and Prevention, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Armando Cavallo
- Diagnostic Imaging Unit, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
| | - Daniele Morosetti
- Interventional Radiology Unit, Department of Biomedicine and Prevention, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Francesco Garaci
- Diagnostic Imaging Unit, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
| | - Francesca Di Giuliano
- Diagnostic Imaging Unit, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
| | - Roberto Floris
- Diagnostic Imaging Unit, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
| | - Fabrizio Sallustio
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Marina Diomedi
- Stroke Center, Department of Systems Medicine, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
| | - Valerio Da Ros
- Interventional Radiology Unit, Department of Biomedicine and Prevention, University Hospital of Rome “Tor Vergata”, Viale Oxford 81, 00133 Rome, Italy
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Laredo C, Rodríguez A, Oleaga L, Hernández‐Pérez M, Renú A, Puig J, Román LS, Planas AM, Urra X, Chamorro Á. Adjunct Thrombolysis Enhances Brain Reperfusion following Successful Thrombectomy. Ann Neurol 2022; 92:860-870. [PMID: 36054449 PMCID: PMC9804472 DOI: 10.1002/ana.26474] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 08/05/2022] [Accepted: 08/05/2022] [Indexed: 01/05/2023]
Abstract
OBJECTIVE This study was undertaken to investigate whether adjunct alteplase improves brain reperfusion following successful thrombectomy. METHODS This single-center, randomized, double-blind, placebo-controlled study included 36 patients (mean [standard deviation] = 70.8 [13.5] years old, 18 [50%] women) with large vessel occlusion undergoing thrombectomy resulting in near-normal (expanded Thrombolysis in Cerebral Infarction [eTICI] b50/67/2c, n = 23, 64%) or normal angiographic reperfusion (eTICI 3, n = 13, 36%). Seventeen patients were randomized to intra-arterial alteplase (0.225mg/kg), and 19 received placebo. At 48 hours, patients had brain perfusion/diffusion-weighted magnetic resonance imaging (MRI) and MRI-spectroscopy. The primary outcome was the difference in the proportion of patients with areas of hypoperfusion on MRI. Secondary outcomes were the infarct expansion ratio (final to initial infarction volume), and the N-acetylaspartate (NAA) peak relative to total creatine as a marker of neuronal integrity. RESULTS The prevalence of hypoperfusion was 24% with intra-arterial alteplase, and 58% with placebo (adjusted odds ratio = 0.20, 95% confidence interval [CI] = 0.04-0.91, p = 0.03). Among 14 patients with final eTICI 3 scores, hypoperfusion was found in 1 of 7 (14%) in the alteplase group and 3 of 7 (43%) in the placebo group. Abnormal brain perfusion was associated with worse functional outcome at day 90. Alteplase significantly reduced the infarct expansion ratio compared with placebo (median [interquartile range (IQR)] = 0.7 [0.5-1.2] vs 3.2 [1.8-5.7], p = 0.01) and resulted in higher NAA peaks (median [IQR] = 1.13 [0.91-1.36] vs 1.00 [0.74-1.22], p < 0.0001). INTERPRETATION There is a high prevalence of areas of hypoperfusion following thrombectomy despite successful reperfusion on angiography. Adjunct alteplase enhances brain reperfusion, which results in reduced expansion of the infarction and improved neuronal integrity. ANN NEUROL 2022;92:860-870.
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Affiliation(s)
- Carlos Laredo
- Area of NeuroscienceAugust Pi i Sunyer Biomedical Research InstituteBarcelonaSpain
| | - Alejandro Rodríguez
- Department of NeuroscienceComprehensive Stroke Center, Hospital Clinic of BarcelonaBarcelonaSpain
| | - Laura Oleaga
- Neuroradiology ServiceHospital Clinic of BarcelonaBarcelonaSpain
| | - María Hernández‐Pérez
- Neuroscience Department, Stroke UnitGermans Trias i Pujol University HospitalBadalonaSpain
| | - Arturo Renú
- Area of NeuroscienceAugust Pi i Sunyer Biomedical Research InstituteBarcelonaSpain,Department of NeuroscienceComprehensive Stroke Center, Hospital Clinic of BarcelonaBarcelonaSpain
| | - Josep Puig
- Department of RadiologyDr Josep Trueta Hospital, Girona Biomedical Research InstituteGironaSpain
| | - Luis San Román
- Neuroradiology ServiceHospital Clinic of BarcelonaBarcelonaSpain
| | - Anna M. Planas
- Area of NeuroscienceAugust Pi i Sunyer Biomedical Research InstituteBarcelonaSpain,Department of Brain Ischemia and NeurodegenerationBarcelona Institute of Biomedical Research–Spanish National Research CouncilBarcelonaSpain
| | - Xabier Urra
- Area of NeuroscienceAugust Pi i Sunyer Biomedical Research InstituteBarcelonaSpain,Department of NeuroscienceComprehensive Stroke Center, Hospital Clinic of BarcelonaBarcelonaSpain,Area of NeuroscienceUniversity of Barcelona, School of MedicineBarcelonaSpain
| | - Ángel Chamorro
- Area of NeuroscienceAugust Pi i Sunyer Biomedical Research InstituteBarcelonaSpain,Department of NeuroscienceComprehensive Stroke Center, Hospital Clinic of BarcelonaBarcelonaSpain,Area of NeuroscienceUniversity of Barcelona, School of MedicineBarcelonaSpain
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9
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Rodríguez-Vázquez A, Laredo C, Renú A, Rudilosso S, Llull L, Amaro S, Obach V, Vera V, Páez A, Oleaga L, Urra X, Chamorro Á. Optimizing the Definition of Ischemic Core in CT Perfusion: Influence of Infarct Growth and Tissue-Specific Thresholds. AJNR Am J Neuroradiol 2022; 43:1265-1270. [PMID: 35981763 PMCID: PMC9451632 DOI: 10.3174/ajnr.a7601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 06/20/2022] [Indexed: 01/26/2023]
Abstract
BACKGROUND AND PURPOSE CTP allows estimating ischemic core in patients with acute stroke. However, these estimations have limited accuracy compared with MR imaging. We studied the effect of applying WM- and GM-specific thresholds and analyzed the infarct growth from baseline imaging to reperfusion. MATERIALS AND METHODS This was a single-center cohort of consecutive patients (n = 113) with witnessed strokes due to proximal carotid territory occlusions with baseline CT perfusion, complete reperfusion, and follow-up DWI. We segmented GM and WM, coregistered CTP with DWI, and compared the accuracy of the different predictions for each voxel on DWI through receiver operating characteristic analysis. We assessed the yield of different relative CBF thresholds to predict the final infarct volume and an estimated infarct growth-corrected volume (subtracting the infarct growth from baseline imaging to complete reperfusion) for a single relative CBF threshold and GM- and WM-specific thresholds. RESULTS The fixed threshold underestimated lesions in GM and overestimated them in WM. Double GM- and WM-specific thresholds of relative CBF were superior to fixed thresholds in predicting infarcted voxels. The closest estimations of the infarct on DWI were based on a relative CBF of 25% for a single threshold, 35% for GM, and 20% for WM, and they decreased when correcting for infarct growth: 20% for a single threshold, 25% for GM, and 15% for WM. The combination of 25% for GM and 15% for WM yielded the best prediction. CONCLUSIONS GM- and WM-specific thresholds result in different estimations of ischemic core in CTP and increase the global accuracy. More restrictive thresholds better estimate the actual extent of the infarcted tissue.
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Affiliation(s)
- A Rodríguez-Vázquez
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
| | - C Laredo
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
| | - A Renú
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (A.R., S.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
- University of Barcelona (A.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
| | - S Rudilosso
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (A.R., S.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
| | - L Llull
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (A.R., S.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
- University of Barcelona (A.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
| | - S Amaro
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (A.R., S.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
- University of Barcelona (A.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
| | - V Obach
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (A.R., S.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
- University of Barcelona (A.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
| | - V Vera
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
| | - A Páez
- Radiology Department (A.P., L.O.), Hospital Clínic, Barcelona, Spain
| | - L Oleaga
- Radiology Department (A.P., L.O.), Hospital Clínic, Barcelona, Spain
| | - X Urra
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (A.R., S.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
- University of Barcelona (A.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
| | - Á Chamorro
- From the Comprehensive Stroke Center (A.R.-V., C.L., A.R., S.R., L.L., S.A., V.O., V.V., X.U., A.C.), Functional Unit of Cerebrovascular Diseases
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (A.R., S.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
- University of Barcelona (A.R., L.L., S.A., V.O., X.U., A.C.), Barcelona, Spain
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Laredo C, Solanes A, Renú A, Rudilosso S, Llull L, López-Rueda A, Macías NG, Rodriguez A, Urra X, Obach V, Pariente JC, Chamorro Á, Radua J, Amaro S. Clinical and therapeutic variables may influence the association between infarct core predicted by CT perfusion and clinical outcome in acute stroke. Eur Radiol 2022; 32:4510-20. [PMID: 35182205 DOI: 10.1007/s00330-022-08590-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/07/2021] [Accepted: 01/22/2022] [Indexed: 12/30/2022]
Abstract
OBJECTIVES After an acute ischemic stroke, patients with a large CT perfusion (CTP) predicted infarct core (pIC) have poor clinical outcome. However, previous research suggests that this relationship may be relevant for subgroups of patients determined by pretreatment and treatment-related variables while negligible for others. We aimed to identify these variables. METHODS We included a cohort of 828 patients with acute proximal carotid arterial occlusions imaged with a whole-brain CTP within 8 h from stroke onset. pIC was computed on CTP Maps (cerebral blood flow < 30%), and poor clinical outcome was defined as a 90-day modified Rankin Scale score > 2. Potential mediators of the association between pIC and clinical outcome were evaluated through first-order and advanced interaction analyses in the derivation cohort (n = 654) for obtaining a prediction model. The derived model was further validated in an independent cohort (n = 174). RESULTS The volume of pIC was significantly associated with poor clinical outcome (OR = 2.19, 95% CI = 1.73 - 2.78, p < 0.001). The strength of this association depended on baseline National Institute of Health Stroke Scale, glucose levels, the use of thrombectomy, and the interaction of age with thrombectomy. The model combining these variables showed good discrimination for predicting clinical outcome in both the derivation cohort and validation cohorts (area under the receiver operating characteristic curve 0.780 (95% CI = 0.746-0.815) and 0.782 (95% CI = 0.715-0.850), respectively). CONCLUSIONS In patients imaged within 8 h from stroke onset, the association between pIC and clinical outcome is significantly modified by baseline and therapeutic variables. These variables deserve consideration when evaluating the prognostic relevance of pIC. KEY POINTS •The volume of CT perfusion (CTP) predicted infarct core (pIC) is associated with poor clinical outcome in acute ischemic stroke imaged within 8 h of onset. •The relationship between pIC and clinical outcome may be modified by baseline clinical severity, glucose levels, thrombectomy use, and the interaction of age with thrombectomy. •CTP pIC should be evaluated in an individual basis for predicting clinical outcome in patients imaged within 8 h from stroke onset.
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11
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Carrera E, Baron JC. Patient Selection for Thrombectomy Using Brain Imaging: Does Time Still Matter? Neurology 2022; 98:867-868. [PMID: 35450965 DOI: 10.1212/wnl.0000000000200719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Emmanuel Carrera
- From the Stroke Center, Department of Clinical Neurosciences (E.C.), Geneva University Hospital; Faculty of Medicine (E.C.), Geneva, Switzerland; Department of Neurology (J.-C.B.), Hôpital Sainte-Anne and Université de Paris; INSERM U1266 (J.-C.B.), Institut de Psychiatrie et Neurosciences de Paris, France
| | - Jean-Claude Baron
- From the Stroke Center, Department of Clinical Neurosciences (E.C.), Geneva University Hospital; Faculty of Medicine (E.C.), Geneva, Switzerland; Department of Neurology (J.-C.B.), Hôpital Sainte-Anne and Université de Paris; INSERM U1266 (J.-C.B.), Institut de Psychiatrie et Neurosciences de Paris, France
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12
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Sarraj A, Campbell BCV, Christensen S, Sitton CW, Khanpara S, Riascos RF, Pujara D, Shaker F, Sharma G, Lansberg MG, Albers GW. Accuracy of CT Perfusion-Based Core Estimation of Follow-up Infarction: Effects of Time Since Last Known Well. Neurology 2022; 98:e2084-e2096. [PMID: 35450966 PMCID: PMC9169942 DOI: 10.1212/wnl.0000000000200269] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 02/08/2022] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND AND OBJECTIVES To assess the accuracy of baseline CT perfusion (CTP) ischemic core estimates. METHODS From SELECT (Optimizing Patient Selection for Endovascular Treatment in Acute Ischemic Stroke), a prospective multicenter cohort study of imaging selection, patients undergoing endovascular thrombectomy who achieved complete reperfusion (modified Thrombolysis In Cerebral Ischemia score 3) and had follow-up diffusion-weighted imaging (DWI) available were evaluated. Follow-up DWI lesions were coregistered to baseline CTP. The difference between baseline CTP core (relative cerebral blood flow [rCBF] <30%) volume and follow-up infarct volume was classified as overestimation (core ≥10 mL larger than infarct), adequate, or underestimation (core ≥25 mL smaller than infarct) and spatial overlap was evaluated. RESULTS Of 101 included patients, median time from last known well (LKW) to imaging acquisition was 138 (82-244) minutes. The median baseline ischemic core estimate was 9 (0-31.9) mL and median follow-up infarct volume was 18.4 (5.3-68.7) mL. All 6/101 (6%) patients with overestimation of the subsequent infarct volume were imaged within 90 minutes of LKW and achieved rapid reperfusion (within 120 minutes of CTP). Using rCBF <20% threshold to estimate ischemic core in patients presenting within 90 minutes eliminated overestimation. Volumetric correlation between the ischemic core estimate and follow-up imaging improved as LKW time to imaging acquisition increased: Spearman ρ <90 minutes 0.33 (p = 0.049), 90-270 minutes 0.63 (p < 0.0001), >270 minutes 0.86 (p < 0.0001). Assessment of the spatial overlap between baseline CTP ischemic core lesion and follow-up infarct demonstrated that a median of 3.2 (0.0-9.0) mL of estimated core fell outside the subsequent infarct. These regions were predominantly in white matter. DISCUSSION Significant overestimation of irreversibly injured ischemic core volume was rare, was only observed in patients who presented within 90 minutes of LKW and achieved reperfusion within 120 minutes of CTP acquisition, and occurred primarily in white matter. Use of a more conservative (rCBF <20%) threshold for estimating ischemic core in patients presenting within 90 minutes eliminated all significant overestimation cases. TRIAL REGISTRATION INFORMATION ClinicalTrials.gov: NCT03876457.
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Affiliation(s)
- Amrou Sarraj
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Bruce C V Campbell
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Soren Christensen
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Clark W Sitton
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Shekhar Khanpara
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Roy F Riascos
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Deep Pujara
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Faris Shaker
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Gagan Sharma
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Maarten G Lansberg
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
| | - Gregory W Albers
- From the Department of Neurology (A.S.), Case Western Reserve University-University Hospitals Cleveland Medical Center, OH; Department of Neurology (B.C.V.C., G.S.), The Royal Melbourne Hospital, University of Melbourne, Parkville, Australia; Department of Neurology (S.C., M.G.L., G.W.A.), Stanford University Medical Center, CA; Departments of Diagnostic and Interventional Imaging (C.W.S., S.K., R.F.R.) and Neurology (F.S.), UTHealth McGovern Medical School, Houston, TX; and Department of Neurology (D.P.), University Hospitals Cleveland Medical Center, OH
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Giammello F, De Martino SRM, Simonetti L, Agati R, Battaglia S, Cirillo L, Gentile M, Migliaccio L, Forlivesi S, Romoli M, Princiotta C, Tonon C, Stagni S, Galluzzo S, Lodi R, Trimarchi G, Toscano A, Musolino RF, Zini A. Predictive value of Tmax perfusion maps on final core in acute ischemic stroke: an observational single-center study. Radiol Med 2022; 127:414-425. [PMID: 35226245 DOI: 10.1007/s11547-022-01467-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 02/01/2022] [Indexed: 12/30/2022]
Abstract
PURPOSE To assess utility of computed tomography perfusion (CTP) protocols for selection of patients with acute ischemic stroke (AIS) for reperfusive treatments and compare the diagnostic accuracy (ACC) in predicting follow-up infarction, using time-to-maximum (Tmax) maps. METHODS We retrospectively reviewed consecutive AIS patients evaluated for reperfusive treatments at comprehensive stroke center, employing a multimodal computed tomography. To assess prognostic accuracy of CTP summary maps in predicting final infarct area (FIA) in AIS patients, we assumed the best correlation between non-viable tissue (NVT) and FIA in early and fully recanalized patients and/or in patients with favorable clinical response (FCR). On the other hand, the tissue at risk (TAR) should better correlate with FIA in untreated patients and in treatment failure. RESULTS We enrolled 158 patients, for which CTP maps with Tmax thresholds of 9.5 s and 16 s, presented sensitivity of 82.5%, specificity of 74.6%, and ACC of 75.9%. In patients selected for perfusion deficit in anterior circulation territory, CTP-Tmax > 16 s has proven relatively reliable to identify NVT in FCR patients, with a tendency to overestimate NVT. Similarly, CTP-Tmax > 9.5 s was reliable for TAR, but it was overestimated comparing to FIA, in patients with unfavorable outcomes. CONCLUSIONS In our experience, Tmax thresholds have proven sufficiently reliable to identify global hypoperfusion, with tendency to overestimate both NVT and TAR, not yielding satisfactory differentiation between true penumbra and benign oligoemia. In particular, the overestimation of NVT could have serious consequences in not selecting potential candidates for a reperfusion treatment.
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Affiliation(s)
- Fabrizio Giammello
- International PhD Translational Molecular Medicine and Surgery, Department of Biomedical, Dental Science and Morphological and Functional Images, University of Messina, Polyclinic Hospital, Via Consolare Valeria 1, 98125, Messina, Italy.
- Stroke Unit, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy.
| | - Sara Rosa Maria De Martino
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Neuroradiology Unit, Bellaria Hospital, Bologna, Italy
| | - Luigi Simonetti
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Neuroradiology Unit, Maggiore Hospital, Bologna, Italy
| | - Raffaele Agati
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Programma Neuroradiologia Con Tecniche Ad Elevata Complessità, Bellaria Hospital, Bologna, Italy
| | - Stella Battaglia
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Programma Neuroradiologia Con Tecniche Ad Elevata Complessità, Bellaria Hospital, Bologna, Italy
| | - Luigi Cirillo
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Neuroradiology Unit, Bellaria Hospital, Bologna, Italy
- DIMES, Department of Specialty, Diagnostic and Experimental Medicine, University of Bologna, Bologna, Italy
| | - Mauro Gentile
- Department of Neurology and Stroke Center, IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Maggiore Hospital, Bologna, Italy
| | - Ludovica Migliaccio
- Department of Neurology and Stroke Center, IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Maggiore Hospital, Bologna, Italy
| | - Stefano Forlivesi
- Department of Neurology and Stroke Center, IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Maggiore Hospital, Bologna, Italy
| | - Michele Romoli
- Department of Neurology and Stroke Center, IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Maggiore Hospital, Bologna, Italy
| | - Ciro Princiotta
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Neuroradiology Unit, Bellaria Hospital, Bologna, Italy
| | - Caterina Tonon
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
- Functional and Molecular Neuroimaging Unit, IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Bologna, Italy
| | - Silvia Stagni
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Neuroradiology Unit, Maggiore Hospital, Bologna, Italy
| | - Simone Galluzzo
- IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Neuroradiology Unit, Maggiore Hospital, Bologna, Italy
| | - Raffaele Lodi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
- Functional and Molecular Neuroimaging Unit, IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Bologna, Italy
| | | | - Antonio Toscano
- Unit of Neurology and Neuromuscular Diseases, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Rosa Fortunata Musolino
- Stroke Unit, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Andrea Zini
- Department of Neurology and Stroke Center, IRCCS Istituto Delle Scienze Neurologiche Di Bologna, Maggiore Hospital, Bologna, Italy
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Renú A, Laredo C, Rodríguez-Vázquez A, Santana D, Werner M, Llull L, Lopez-Rueda A, Urra X, Rudilosso S, Obach V, Amaro S, Chamorro Á. Characterization of Subarachnoid Hyperdensities After Thrombectomy for Acute Stroke Using Dual-Energy CT. Neurology 2021; 98:e601-e611. [PMID: 34921104 DOI: 10.1212/wnl.0000000000013198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 11/30/2021] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND AND OBJECTIVES The presence of post-interventional subarachnoid hyperdensities (SA-HD) is a relatively common finding after mechanical thrombectomy (MT). We aimed to assess the incidence, characteristics, clinical relevance and predictors of SA-HD after MT as categorized through the use of post-interventional Dual Energy-CT (DE-CT). METHODS A single-center consecutive series of acute stroke patients treated with MT were retrospectively reviewed. Post-treatment SA-HD were defined as incident extra-axial hyperdensities in a follow-up DE-CT performed within a median of 8 hours after MT. SA-HD were further classified according to their content (isolated contrast extravasation versus blood extravasation) and extension [diffuse (hyperdensities in more than one extraparenchymal compartments) versus non-diffuse]. Adjusted logistic regression models assessed the association of SA-HD with pretreatment and procedural variables and with bad clinical outcome (shift towards worse categories in the ordinal Rankin Scale at 90 days). RESULTS SA-HD were observed in 120 (28%) of the 424 included patients (isolated contrast extravasation n=22, blood extravasation n=98). In this group, SA-HD were diffuse in 72 (60%) patients (isolated contrast extravasation n=7, blood extravasation n=65) and non-diffuse in 48 (40%) patients (isolated contrast extravasation n=15, blood extravasation n=33). Diffuse SA-HD were significantly associated with worse clinical outcome in adjusted models (cOR=2.3, 95%CI=1.36-4.00, p=0.002), unlike the specific SA-HD content alone. In contrast with the absence of SA-HD, only the diffuse pattern with blood extravasation was significantly associated with worse clinical outcome (cOR=2.4, 95%CI=1.36-4.15, p=0.002). Diffuse SA-HD patterns were predicted by M2 occlusions, more thrombectomy passes and concurrent parenchymal hematomas. DISCUSSION In our cohort of patients imaged within a median of 8 hours after MT, post-interventional SA-HD showed a diffuse pattern in 17% of thrombectomies and were associated with more arduous procedures. Diffuse SA-HD but not local collections of blood or contrast extravasations were associated with an increased risk of poor outcome and death. These findings reinforce the need for improvement in reperfusion strategies. CLASSIFICATION OF EVIDENCE This study provides Class II evidence that in individuals with proximal carotid artery territory occlusions treated with mechanical thrombectomy, diffuse post-interventional subarachnoid hyperdensities on imaging 8 hours post-procedure are associated with worse clinical outcomes at 90 days.
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Affiliation(s)
- Arturo Renú
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Carlos Laredo
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Alejandro Rodríguez-Vázquez
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Daniel Santana
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | | | - Laura Llull
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | | | - Xabier Urra
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Salvatore Rudilosso
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Víctor Obach
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Sergi Amaro
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Ángel Chamorro
- Comprehensive Stroke Center, Department of Neuroscience, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
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Liu B, Huang D, Guo Y, Sun X, Chen C, Zhai X, Jin X, Zhu H, Li P, Yu W. Recent advances and perspectives of postoperative neurological disorders in the elderly surgical patients. CNS Neurosci Ther 2021; 28:470-483. [PMID: 34862758 PMCID: PMC8928923 DOI: 10.1111/cns.13763] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 10/15/2021] [Accepted: 10/16/2021] [Indexed: 12/17/2022] Open
Abstract
Postoperative neurological disorders, including postoperative delirium (POD), postoperative cognitive dysfunction (POCD), postoperative covert ischemic stroke, and hemorrhagic stroke, are challenging clinical problems in the emerging aged surgical population. These disorders can deteriorate functional outcomes and long‐term quality of life after surgery, resulting in a substantial social and financial burden to the family and society. Understanding predisposing and precipitating factors may promote individualized preventive treatment for each disorder, as several risk factors are modifiable. Besides prevention, timely identification and treatment of etiologies and symptoms can contribute to better recovery from postoperative neurological disorders and lower risk of long‐term cognitive impairment, disability, and even death. Herein, we summarize the diagnosis, risk factors, prevention, and treatment of these postoperative complications, with emphasis on recent advances and perspectives.
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Affiliation(s)
- Biying Liu
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Dan Huang
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Yunlu Guo
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Xiaoqiong Sun
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Caiyang Chen
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Xiaozhu Zhai
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Xia Jin
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Hui Zhu
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Peiying Li
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
| | - Weifeng Yu
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiao Tong University, Shanghai, China
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16
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Wang C, Shi Z, Yang M, Huang L, Fang W, Jiang L, Ding J, Wang H. Deep learning-based identification of acute ischemic core and deficit from non-contrast CT and CTA. J Cereb Blood Flow Metab 2021; 41:3028-3038. [PMID: 34102912 PMCID: PMC8756471 DOI: 10.1177/0271678x211023660] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The accurate identification of irreversible infarction and salvageable tissue is important in planning the treatments for acute ischemic stroke (AIS) patients. Computed tomographic perfusion (CTP) can be used to evaluate the ischemic core and deficit, covering most of the territories of anterior circulation, but many community hospitals and primary stroke centers do not have the capability to perform CTP scan in emergency situation. This study aimed to identify AIS lesions from widely available non-contrast computed tomography (NCCT) and CT angiography (CTA) using deep learning. A total of 345AIS patients from our emergency department were included. A multi-scale 3D convolutional neural network (CNN) was used as the predictive model with inputs of NCCT, CTA, and CTA+ (8 s delay after CTA) images. An external cohort with 108 patients was included to further validate the generalization performance of the proposed model. Strong correlations with CTP-RAPID segmentations (r = 0.84 for core, r = 0.83 for deficit) were observed when NCCT, CTA, and CTA+ images were all used in the model. The diagnostic decisions according to DEFUSE3 showed high accuracy when using NCCT, CTA, and CTA+ (0.90±0.04), followed by the combination of NCCT and CTA (0.87±0.04), CTA-alone (0.76±0.06), and NCCT-alone (0.53±0.09).
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Affiliation(s)
- Chengyan Wang
- Human Phenome Institute, Fudan University, Shanghai, China.,Zhangjiang Fudan International Innovation Center, Shanghai, China
| | - Zhang Shi
- Department of Radiology, Changhai Hospital, Shanghai, China
| | - Ming Yang
- NeuroBlem Ltd. Co., Shanghai, China.,Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China
| | - Lixiang Huang
- Department of Radiology, Tianjin First Central Hospital, Tianjin, China
| | | | - Li Jiang
- NeuroBlem Ltd. Co., Shanghai, China
| | - Jing Ding
- Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai, China
| | - He Wang
- Human Phenome Institute, Fudan University, Shanghai, China.,Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China.,Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence (Fudan University), Ministry of Education, Shanghai, China
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17
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Chen Z, Li Q, Li R, Zhao H, Li Z, Zhou Y, Bian R, Jin X, Lou M, Bai R. Ensemble learning accurately predicts the potential benefits of thrombolytic therapy in acute ischemic stroke. Quant Imaging Med Surg 2021; 11:3978-3989. [PMID: 34476183 DOI: 10.21037/qims-21-33] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 04/16/2021] [Indexed: 11/06/2022]
Abstract
Background Finding methods to accurately predict the final infarct volumes for acute ischemic stroke patients with full or no recanalization would significantly help to evaluate the potential benefits of thrombolytic therapy. We proposed such a method by constructing a model of ensemble deep learning and machine learning using diffusion-weighted imaging (DWI) only. Methods The proposed prediction model (named AUNet) combines an adaptive linear ensemble model (ALEM) of machine learning and a deep U-Net network with an accelerated non-local module (U-NL-Net) to learn voxel-wise and spatial features, respectively. Of 40 patients with acute ischemic stroke who received thrombolytic therapy, 17 were fully recanalized, 14 were not recanalized, and nine were partially recanalized. The AUNet was separately trained for full recanalization conditions (AUNetR) and no recanalization (AUNetN) as the best and worst outcomes of thrombolysis, respectively. Results AUNet performed significantly better in predicting the final infarct volumes in both the recanalization and non-recanalization conditions [area under the receiver operating characteristic curve (AUC) =0.898±0.022, recanalization; AUC =0.875±0.036, non-recanalization: Matthew's correlation coefficient (MCC) =0.863±0.033, recanalization; MCC =0.851±0.025, non-recanalization] than the fixed-thresholding method (AUC =0.776±0.021, P<0.0001, recanalization; AUC =0.692±0.023, P<0.0001, non-recanalization: MCC =0.742±0.035, recanalization; MCC =0.671±0.024, non-recanalization), the logistic regression method (AUC =0.797±0.023, P<0.003, recanalization; AUC =0.751±0.030, P<0.003, non-recanalization: MCC =0.762±0.035, recanalization; MCC =0.730±0.031, non-recanalization), and a recently developed convolutional neural network (AUC =0.814±0.013, P<0.003, recanalization; AUC =0.781±0.027, P<0.003, non-recanalization: MCC =792±0.022, recanalization; MCC =0.758±0.016, non-recanalization). The potential benefit of thrombolysis calculated from AUNetR and AUNetN showed large individual differences (from 12.81% to 239.73%). Conclusions AUNet improved predictive accuracy over current state-of-the-art methods. More importantly, the accurate prediction of infarct volumes under different recanalization conditions may provide benefitial information for physicians in selecting suitable patients for thrombolytic therapy.
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Affiliation(s)
- Zhihong Chen
- Institute of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China
| | - Qingqing Li
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
| | - Renyuan Li
- Department of Physical Medicine and Rehabilitation, The Affiliated Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,Interdisciplinary Institute of Neuroscience and Technology, School of Medicine, Zhejiang University, Hangzhou, China
| | - Han Zhao
- Institute of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China
| | - Zhaoqing Li
- Interdisciplinary Institute of Neuroscience and Technology, School of Medicine, Zhejiang University, Hangzhou, China.,Key Laboratory of Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, China
| | - Ying Zhou
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
| | - Renxiu Bian
- Department of Physical Medicine and Rehabilitation, The Affiliated Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Xinyu Jin
- Institute of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China
| | - Min Lou
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
| | - Ruiliang Bai
- Department of Physical Medicine and Rehabilitation, The Affiliated Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,Interdisciplinary Institute of Neuroscience and Technology, School of Medicine, Zhejiang University, Hangzhou, China.,Key Laboratory of Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, China
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18
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Seners P, Oppenheim C, Turc G, Albucher JF, Guenego A, Raposo N, Christensen S, Calvière L, Viguier A, Darcourt J, Januel AC, Mlynash M, Sommet A, Thalamas C, Sibon I, Rousseau V, Tourdias T, Menegon P, Bonneville F, Mazighi M, Charron S, Legrand L, Cognard C, Albers GW, Baron JC, Olivot JM. Perfusion Imaging and Clinical Outcome in Acute Ischemic Stroke with Large Core. Ann Neurol 2021; 90:417-427. [PMID: 34216396 DOI: 10.1002/ana.26152] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 06/28/2021] [Accepted: 06/28/2021] [Indexed: 11/07/2022]
Abstract
OBJECTIVE Mechanical thrombectomy (MT) is not recommended for acute stroke with large vessel occlusion (LVO) and a large volume of irreversibly injured tissue ("core"). Perfusion imaging may identify a subset of patients with large core who benefit from MT. METHODS We compared two cohorts of LVO-related patients with large core (>50 ml on diffusion-weighted-imaging or CT-perfusion using RAPID), available perfusion imaging, and treated within 6 hours from onset by either MT + Best Medical Management (BMM) in one prospective study, or BMM alone in the pre-MT era from a prospective registry. Primary outcome was 90-day modified Rankin Scale ≤2. We searched for an interaction between treatment group and amount of penumbra as estimated by the mismatch ratio (MMRatio = critical hypoperfusion/core volume). RESULTS Overall, 107 patients were included (56 MT + BMM and 51 BMM): Mean age was 68 ± 15 years, median core volume 99 ml (IQR: 72-131) and MMRatio 1.4 (IQR: 1.0-1.9). Baseline clinical and radiological variables were similar between the two groups, except for a higher intravenous thrombolysis rate in the BMM group. The MMRatio strongly modified the clinical outcome following MT (pinteraction < 0.001 for continuous MMRatio); MT was associated with a higher rate of good outcome in patients with, but not in those without, MMRatio>1.2 (adjusted OR [95% CI] = 6.8 [1.7-27.0] vs 0.7 [0.1-6.2], respectively). Similar findings were present for MMRatio ≥1.8 in the subgroup with core ≥70 ml. Parenchymal hemorrhage on follow-up imaging was more frequent in the MT + BMM group regardless of the MMRatio. INTERPRETATION Perfusion imaging may help select which patients with large core should be considered for MT. Randomized studies are warranted. ANN NEUROL 2021.
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Affiliation(s)
- Pierre Seners
- Neurology Department, GHU Paris Psychiatrie et Neurosciences, Institut de Psychiatrie et Neurosciences de Paris (IPNP), INSERM U1266, Université de Paris, FHU Neurovasc, Paris, France
- Neurology Department, Hôpital Fondation A. de Rothschild, Paris, France
| | - Catherine Oppenheim
- Radiology Department, GHU Paris Psychiatrie et Neurosciences, Institut de Psychiatrie et Neurosciences de Paris (IPNP), INSERM U1266, Université de Paris, FHU Neurovasc, Paris, France
| | - Guillaume Turc
- Neurology Department, GHU Paris Psychiatrie et Neurosciences, Institut de Psychiatrie et Neurosciences de Paris (IPNP), INSERM U1266, Université de Paris, FHU Neurovasc, Paris, France
| | - Jean-François Albucher
- Acute Stroke Unit, Hôpital Pierre-Paul Riquet, Centre Hospitalier Universitaire de Toulouse and Toulouse NeuroImaging Center, Université de Toulouse, Inserm, UPS, Toulouse, France
| | - Adrien Guenego
- Department of Neuroradiology, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Nicolas Raposo
- Acute Stroke Unit, Hôpital Pierre-Paul Riquet, Centre Hospitalier Universitaire de Toulouse and Toulouse NeuroImaging Center, Université de Toulouse, Inserm, UPS, Toulouse, France
| | | | - Lionel Calvière
- Acute Stroke Unit, Hôpital Pierre-Paul Riquet, Centre Hospitalier Universitaire de Toulouse and Toulouse NeuroImaging Center, Université de Toulouse, Inserm, UPS, Toulouse, France
| | - Alain Viguier
- Acute Stroke Unit, Hôpital Pierre-Paul Riquet, Centre Hospitalier Universitaire de Toulouse and Toulouse NeuroImaging Center, Université de Toulouse, Inserm, UPS, Toulouse, France
| | - Jean Darcourt
- Department of Neuroradiology, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Anne-Christine Januel
- Department of Neuroradiology, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | | | - Agnes Sommet
- Clinical Investigation Center, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Claire Thalamas
- Clinical Investigation Center, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Igor Sibon
- Unité Neurovasculaire, Centre Hospitalier Universitaire de Bordeaux, Université de Bordeaux, Bordeaux, France
| | - Vanessa Rousseau
- Clinical Investigation Center, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Thomas Tourdias
- Department of Neuroradiology, Centre Hospitalier Universitaire de Bordeaux, Université de Bordeaux, Bordeaux, France
| | - Patrice Menegon
- Department of Neuroradiology, Centre Hospitalier Universitaire de Bordeaux, Université de Bordeaux, Bordeaux, France
| | - Fabrice Bonneville
- Department of Neuroradiology, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Mikael Mazighi
- Department of Interventional Neuroradiology, Hôpital Fondation A. de Rothschild, Paris, France
| | - Sylvain Charron
- Radiology Department, GHU Paris Psychiatrie et Neurosciences, Institut de Psychiatrie et Neurosciences de Paris (IPNP), INSERM U1266, Université de Paris, FHU Neurovasc, Paris, France
| | - Laurence Legrand
- Radiology Department, GHU Paris Psychiatrie et Neurosciences, Institut de Psychiatrie et Neurosciences de Paris (IPNP), INSERM U1266, Université de Paris, FHU Neurovasc, Paris, France
| | - Christophe Cognard
- Department of Neuroradiology, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | | | - Jean-Claude Baron
- Neurology Department, GHU Paris Psychiatrie et Neurosciences, Institut de Psychiatrie et Neurosciences de Paris (IPNP), INSERM U1266, Université de Paris, FHU Neurovasc, Paris, France
| | - Jean-Marc Olivot
- Acute Stroke Unit, Hôpital Pierre-Paul Riquet, Centre Hospitalier Universitaire de Toulouse and Toulouse NeuroImaging Center, Université de Toulouse, Inserm, UPS, Toulouse, France
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19
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Psychogios MN, Katsanos AH, Tsivgoulis G, Brehm A. Patient Outcomes to Evaluate Machine Outputs. Clin Neuroradiol 2021; 31:509-510. [PMID: 34032879 DOI: 10.1007/s00062-021-01026-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 04/18/2021] [Indexed: 10/21/2022]
Affiliation(s)
- Marios-Nikos Psychogios
- Department of Neuroradiology, Clinic for Radiology & Nuclear Medicine, University Hospital Basel, Basel, Switzerland.
| | - Aristeidis H Katsanos
- Department of Medicine (Neurology), McMaster University/Population Health Research Institute, Hamilton, Canada
| | - Georgios Tsivgoulis
- Second Department of Neurology, National and Kapodistrian University of Athens, Athens, Greece
| | - Alex Brehm
- Department of Neuroradiology, Clinic for Radiology & Nuclear Medicine, University Hospital Basel, Basel, Switzerland
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20
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Abstract
The discovery that brain tissue could potentially be salvaged from ischaemia due to stroke, has led to major advances in the development of therapies for ischemic stroke. In this review, we detail the advances in the understanding of this area termed the ischaemic penumbra, from its discovery to the evolution of imaging techniques, and finally some of the treatments developed. Evolving from animal studies from the 70s and 80s and translated to clinical practice, the field of ischemic reperfusion therapy has largely been guided by an array of imaging techniques developed to positively identify the ischemic penumbra, including positron emission tomography, computed tomography and magnetic resonance imaging. More recently, numerous penumbral identification imaging studies have allowed for a better understanding of the progression of the ischaemic core at the expense of the penumbra, and identification of patients than can benefit from reperfusion therapies in the acute phase. Importantly, 40 years of critical imaging research on the ischaemic penumbra have allowed for considerable extension of the treatment time window and better patient selection for reperfusion therapy. The translation of the penumbra concept into routine clinical practice has shown that "tissue is at least as important as time."
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Affiliation(s)
- Charlotte M Ermine
- Florey Institute of Neuroscience and Mental Health, Melbourne, Australia
| | - Andrew Bivard
- Department of Medicine, Melbourne Brain Centre at The Royal Melbourne Hospital, Parkville, Australia.,Department of Neurology, Melbourne Brain Centre at The Royal Melbourne Hospital, Parkville, Australia
| | - Mark W Parsons
- Department of Medicine, Melbourne Brain Centre at The Royal Melbourne Hospital, Parkville, Australia.,Department of Neurology, Melbourne Brain Centre at The Royal Melbourne Hospital, Parkville, Australia
| | - Jean-Claude Baron
- Institute of Psychiatry and Neuroscience of Paris (IPNP), Université de Paris, Paris, France.,GHU Paris Psychiatrie et Neurosciences, Hôpital Sainte Anne, Paris, France
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21
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Santana D, Laredo C, Renú A, Rudilosso S, Llull L, Urra X, Obach V, López-Rueda A, Macías N, Amaro S, Chamorro A. "Incidence and Clinico-Radiological Correlations of Early Arterial Reocclusion After Successful Thrombectomy in Acute Ischemic Stroke". Transl Stroke Res 2020; 11:1314-21. [PMID: 32314181 DOI: 10.1007/s12975-020-00816-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/04/2020] [Accepted: 04/07/2020] [Indexed: 12/26/2022]
Abstract
About half of acute stroke patients treated with mechanical thrombectomy (MT) do not show clinical improvement despite successful recanalization. Early arterial reocclusion (EAR) may be one of the causes that explain this phenomenon. We aimed to analyze the incidence and clinico-radiological correlations of EAR after successful MT. A consecutive series of patients treated with MT between 2010 and 2018 at a single-center included in a prospective registry was retrospectively reviewed. Specific inclusion criteria for the analysis were (1) successful recanalization after MT and (2) availability of pretreatment CT perfusion and follow-up MRI. EAR was evaluated in the follow-up MR angiography. Adjusted regression models were used to analyze the association of EAR with pretreatment variables, infarct growth, final infarct volume, and clinical outcome at 90 days (ordinal distribution of the modified Rankin Scale scores). Out of 831 MT performed, 218 (26%) patients fulfilled inclusion criteria, from whom 13 (6%) suffered EAR. In multivariate analysis controlled by confounders, EAR was independently associated with poor clinical outcome (aOR = 3.2, 95%CI = 1.16-9.72, p = 0.039), greater final infarct volume (aOR = 3.8, 95%CI = 1.93-7.49, p < 0.001), and increased infarct growth (aOR = 8.5, CI95% = 2.04-34.70, p = 0.003). According to mediation analyses, the association between EAR and poor clinical outcome was mainly explained through its effects on final infarct volume and infarct growth. Additionally, EAR was associated with non-cardioembolic etiology (adjusted Odds Ratio (aOR) = 10.1, 95%CI = 1.25-81.35, p = 0.030) and longer procedural time (aOR = 2.6, 95%CI = 1.31-5.40, p = 0.007). Although uncommon, EAR hampers the benefits of successful recanalization after MT resulting in increased infarct growth and larger final lesions.
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Rudilosso S, Laredo C, Vivancos C, Urra X, Llull L, Renú A, Obach V, Zhao Y, Moreno JL, Lopez-Rueda A, Amaro S, Chamorro Á. Leukoaraiosis May Confound the Interpretation of CT Perfusion in Patients Treated with Mechanical Thrombectomy for Acute Ischemic Stroke. AJNR Am J Neuroradiol 2019; 40:1323-1329. [PMID: 31345941 DOI: 10.3174/ajnr.a6139] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 06/19/2019] [Indexed: 12/19/2022]
Abstract
BACKGROUND AND PURPOSE Leukoaraiosis frequently coexists in patients with acute stroke. We studied whether leukoaraiosis could confound the interpretation of CTP findings in patients treated with mechanical thrombectomy. MATERIALS AND METHODS We analyzed 236 patients with stroke treated with mechanical thrombectomy and studied with CTP, of whom 127 (53.8%) achieved complete reperfusion. Periventricular white matter hyperintensities on MR imaging and hypodensities on NCCT were assessed through the Fazekas score. CTP-predicted nonviable tissue was defined as relative CBF <30%, and final infarct volume was quantified in DWI. We estimated mean MTT, CBV, and CBF in the asymptomatic hemisphere. In patients achieving complete reperfusion, we assessed the accuracy of nonviable tissue to predict final infarct volume using the intraclass correlation coefficient across periventricular hyperintensity/hypodensity Fazekas scores and variable relative CBF cutoffs. RESULTS MTT was longer (Spearman ρ = 0.279, P < .001) and CBF was lower (ρ = -0.263, P < .001) as the periventricular hyperintensity Fazekas score increased, while CBV was similar across groups (ρ = -0.043, P = .513). In the subgroup of patients achieving complete reperfusion, nonviable tissue-final infarct volume reliability was excellent in patients with periventricular hyperintensity Fazekas score grade 0 (intraclass correlation coefficient, 0.900; 95% CI, 0.805-0.950), fair in patients with periventricular hyperintensity Fazekas scores 1 (intraclass correlation coefficient, 0.569; 95% CI, 0.327-0.741) and 2 (intraclass correlation coefficient, 0.444; 95% CI, 0.165-0.657), and poor in patients with periventricular hyperintensity Fazekas score 3 (intraclass correlation coefficient, 0.310; 95% CI, -0.359-0.769). The most accurate cutoffs were relative CBF <30% for periventricular hyperintensity Fazekas score grades 0 and 1, relative CBF <25% for periventricular hyperintensity Fazekas score 2, and relative CBF <20% for periventricular hyperintensity Fazekas score 3. The reliability analysis according to periventricular hypodensity Fazekas score grades on NCCT was similar to that in follow-up MR imaging. CONCLUSIONS In patients with stroke, the presence of leukoaraiosis confounds the interpretation of CTP despite proper adjustment of CBF thresholds.
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Affiliation(s)
- S Rudilosso
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - C Laredo
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - C Vivancos
- Neurosurgery Service (C.V.), Universitary Hospital La Paz, Madrid, Spain
| | - X Urra
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - L Llull
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - A Renú
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - V Obach
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Y Zhao
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - J L Moreno
- Department of Radiology (J.L.M., A.L.-R.), Hospital Clínic, University of Barcelona, Barcelona, Spain
| | - A Lopez-Rueda
- Department of Radiology (J.L.M., A.L.-R.), Hospital Clínic, University of Barcelona, Barcelona, Spain
| | - S Amaro
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | - Á Chamorro
- From the Department of Neuroscience (S.R., C.L., X.U., L.L., A.R., V.O., Y.Z., S.A., Á.C.)., Comprehensive Stroke Center, Hospital Clinic, University of Barcelona and August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain .,Medicine Department (Á.C.), School of Medicine, University of Barcelona, Barcelona, Spain
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