Comparison of four different collateral scores in acute ischemic stroke by CT angiography

Şeker, Fatih; Potreck, Arne; Möhlenbruch, Markus; Bendszus, Martin; Pham, Mirko

doi:10.1136/neurintsurg-2015-012101

Cited by 62 publications

(56 citation statements)

References 30 publications

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“…Various perfusion parameters in both CT and MRI have been studied (Lansberg et al., ; Mundiyanapurath et al., ; Seker et al., ; Straka et al., ). Mokin et al.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have shown that infarct core correlates well with collaterals and final infarct volume in anterior circulation stroke (Lee et al., ; Mokin et al., ; Seker, Potreck, Möhlenbruch, Bendszus, & Pham, ). The correlation of various T max volumes with clinical outcome, however, is not clear yet.…”

Section: Introductionmentioning

confidence: 87%

“…All patients underwent either multimodal CT imaging or MRI prior to thrombectomy as described recently (Potreck et al., ; Seker et al., ).…”

Section: Methodsmentioning

confidence: 99%

“…Acquisition parameters for CTA were 120 kV and 20 mAs. A single contrast bolus of 65 ml Xenetix 350 was given with a flow rate of 4.0 ml/s, followed by a saline flush of 20 ml and a flow rate of 4.0 ml/s (Seker et al., ).…”

Section: Methodsmentioning

confidence: 99%

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Correlation of T_max volumes with clinical outcome in anterior circulation stroke

et al. 2017

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Background and PurposeThe recent thrombectomy trials have shown that perfusion imaging is helpful in proper patient selection in thromboembolic stroke. In this study, we analyzed the correlation of pretreatment T max volumes in MR and CT perfusion with clinical outcome after thrombectomy.MethodsForty‐one consecutive patients with middle cerebral artery occlusion (MCA) or carotid T occlusion treated with thrombectomy were included. T max volumes at delays of >4, 6, 8, and 10 s as well as infarct core and mismatch ratio were automatically estimated in preinterventional MRI or CT perfusion using RAPID software. These perfusion parameters were correlated with clinical outcome. Outcome was assessed using modified Rankin scale at 90 days.ResultsIn patients with successful recanalization of MCA occlusion, T max > 8 and 10 s showed the best linear correlation with clinical outcome (r = 0.75; p = .0139 and r = 0.73; p = .0139), better than infarct core (r = 0.43; p = .2592). In terminal internal carotid artery occlusions, none of the perfusion parameters showed a significant correlation with clinical outcome.Conclusions T max at delays of >8 and 10 s is a good predictor for clinical outcome in MCA occlusions. In carotid T occlusion, however, T max volumes do not correlate with outcome.

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“…Various perfusion parameters in both CT and MRI have been studied (Lansberg et al., ; Mundiyanapurath et al., ; Seker et al., ; Straka et al., ). Mokin et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 87%

“…All patients underwent either multimodal CT imaging or MRI prior to thrombectomy as described recently (Potreck et al., ; Seker et al., ).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Correlation of T_max volumes with clinical outcome in anterior circulation stroke

et al. 2017

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“…However, the Miteff collateral grades, or a modified version of the Christoforidis collateral grading system 33 for dynamic CTA, were not significantly linearly correlated with the infarct core volume and the mismatch ratio. 42 …”

Section: Imaging Methods and Grading Criteria For Cerebral Collateralmentioning

confidence: 99%

Guidelines for evaluation and management of cerebral collateral circulation in ischaemic stroke 2017

et al. 2018

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Collateral circulation plays a vital role in sustaining blood flow to the ischaemic areas in acute, subacute or chronic phases after an ischaemic stroke or transient ischaemic attack. Good collateral circulation has shown protective effects towards a favourable functional outcome and a lower risk of recurrence in stroke attributed to different aetiologies or undergoing medical or endovascular treatment. Over the past decade, the importance of collateral circulation has attracted more attention and is becoming a hot spot for research. However, the diversity in imaging methods and criteria to evaluate collateral circulation has hindered comparisons of findings from different cohorts and further studies in exploring the clinical relevance of collateral circulation and possible methods to enhance collateral flow. The statement is aimed to update currently available evidence and provide evidence-based recommendations regarding grading methods for collateral circulation, its significance in patients with stroke and methods under investigation to improve collateral flow.

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Flow reduction due to arterial catheterization during stroke treatment – A computational study using a distributed compartment model

Pradhan,

Mut,

Sosale

et al. 2024

Numer Methods Biomed Eng

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The effectiveness of various stroke treatments depends on the anatomical variability of the cerebral vasculature, particularly the collateral blood vessel network. Collaterals at the level of the Circle of Willis and distal collaterals, such as the leptomeningeal arteries, serve as alternative avenues of flow when the primary pathway is obstructed during an ischemic stroke. Stroke treatment typically involves catheterization of the primary pathway, and the potential risk of further flow reduction to the affected brain area during this treatment has not been previously investigated. To address this clinical question, we derived the lumped parameters for catheterized blood vessels and implemented a corresponding distributed compartment (0D) model. This 0D model was validated against an experimental model and benchmark test cases solved using a 1D model. Additionally, we compared various off‐center catheter trajectories modeled using a 3D solver to this 0D model. The differences between them were minimal, validating the simplifying assumption of the central catheter placement in the 0D model. The 0D model was then used to simulate blood flows in realistic cerebral arterial networks with different collateralization characteristics. Ischemic strokes were modeled by occlusion of the M1 segment of the middle cerebral artery in these networks. Catheters of different diameters were inserted up to the obstructed segment and flow alterations in the network were calculated. Results showed up to 45% maximum blood flow reduction in the affected brain region. These findings suggest that catheterization during stroke treatment may have a further detrimental effect for some patients with poor collateralization.

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Comparison of four different collateral scores in acute ischemic stroke by CT angiography

Cited by 62 publications

References 30 publications

Correlation of T_max volumes with clinical outcome in anterior circulation stroke

Correlation of T_max volumes with clinical outcome in anterior circulation stroke

Guidelines for evaluation and management of cerebral collateral circulation in ischaemic stroke 2017

Flow reduction due to arterial catheterization during stroke treatment – A computational study using a distributed compartment model

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Comparison of four different collateral scores in acute ischemic stroke by CT angiography

Cited by 62 publications

References 30 publications

Correlation of Tmax volumes with clinical outcome in anterior circulation stroke

Correlation of Tmax volumes with clinical outcome in anterior circulation stroke

Guidelines for evaluation and management of cerebral collateral circulation in ischaemic stroke 2017

Flow reduction due to arterial catheterization during stroke treatment – A computational study using a distributed compartment model

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Correlation of T_max volumes with clinical outcome in anterior circulation stroke

Correlation of T_max volumes with clinical outcome in anterior circulation stroke