Factors Associated With Fast Early Infarct Growth in Patients With Acute Ischemic Stroke With a Large Vessel Occlusion.


Journal

Neurology
ISSN: 1526-632X
Titre abrégé: Neurology
Pays: United States
ID NLM: 0401060

Informations de publication

Date de publication:
21 Nov 2023
Historique:
received: 02 06 2023
accepted: 15 08 2023
pmc-release: 21 11 2024
medline: 22 11 2023
pubmed: 10 10 2023
entrez: 9 10 2023
Statut: ppublish

Résumé

The optimal methods for predicting early infarct growth rate (EIGR) in acute ischemic stroke with a large vessel occlusion (LVO) have not been established. We aimed to study the factors associated with EIGR, with a focus on the collateral circulation as assessed by the hypoperfusion intensity ratio (HIR) on perfusion imaging, and determine whether the associations found are consistent across imaging modalities. Retrospective multicenter international study including patients with anterior circulation LVO-related acute stroke with witnessed stroke onset and baseline perfusion imaging (MRI or CT) performed within 24 hours from symptom onset. To avoid selection bias, patients were selected from (1) the prospective registries of 4 comprehensive stroke centers with systematic use of perfusion imaging and including both thrombectomy-treated and untreated patients and (2) 1 prospective thrombectomy study where perfusion imaging was acquired per protocol, but treatment decisions were made blinded to the results. EIGR was defined as infarct volume on baseline imaging divided by onset-to-imaging time and fast progressors as EIGR ≥10 mL/h. The HIR, defined as the proportion of time-to-maximum (Tmax) >6 second with Tmax >10 second volume, was measured on perfusion imaging using RAPID software. The factors independently associated with fast progression were studied using multivariable logistic regression models, with separate analyses for CT- and MRI-assessed patients. Overall, 1,127 patients were included (CT, n = 471; MRI, n = 656). Median age was 74 years (interquartile range [IQR] 62-83), 52% were male, median NIH Stroke Scale was 16 (IQR 9-21), median HIR was 0.42 (IQR 0.26-0.58), and 415 (37%) were fast progressors. The HIR was the primary factor associated with fast progression, with very similar results across imaging modalities: The proportion of fast progressors was 4% in the first HIR quartile (i.e., excellent collaterals), ∼15% in the second, ∼50% in the third, and ∼77% in the fourth ( The HIR is the primary factor associated with fast infarct progression, regardless of imaging modality. These results have implication for neuroprotection trial design, as well as informing triage decisions at primary stroke centers.

Sections du résumé

BACKGROUND AND OBJECTIVES OBJECTIVE
The optimal methods for predicting early infarct growth rate (EIGR) in acute ischemic stroke with a large vessel occlusion (LVO) have not been established. We aimed to study the factors associated with EIGR, with a focus on the collateral circulation as assessed by the hypoperfusion intensity ratio (HIR) on perfusion imaging, and determine whether the associations found are consistent across imaging modalities.
METHODS METHODS
Retrospective multicenter international study including patients with anterior circulation LVO-related acute stroke with witnessed stroke onset and baseline perfusion imaging (MRI or CT) performed within 24 hours from symptom onset. To avoid selection bias, patients were selected from (1) the prospective registries of 4 comprehensive stroke centers with systematic use of perfusion imaging and including both thrombectomy-treated and untreated patients and (2) 1 prospective thrombectomy study where perfusion imaging was acquired per protocol, but treatment decisions were made blinded to the results. EIGR was defined as infarct volume on baseline imaging divided by onset-to-imaging time and fast progressors as EIGR ≥10 mL/h. The HIR, defined as the proportion of time-to-maximum (Tmax) >6 second with Tmax >10 second volume, was measured on perfusion imaging using RAPID software. The factors independently associated with fast progression were studied using multivariable logistic regression models, with separate analyses for CT- and MRI-assessed patients.
RESULTS RESULTS
Overall, 1,127 patients were included (CT, n = 471; MRI, n = 656). Median age was 74 years (interquartile range [IQR] 62-83), 52% were male, median NIH Stroke Scale was 16 (IQR 9-21), median HIR was 0.42 (IQR 0.26-0.58), and 415 (37%) were fast progressors. The HIR was the primary factor associated with fast progression, with very similar results across imaging modalities: The proportion of fast progressors was 4% in the first HIR quartile (i.e., excellent collaterals), ∼15% in the second, ∼50% in the third, and ∼77% in the fourth (
DISCUSSION CONCLUSIONS
The HIR is the primary factor associated with fast infarct progression, regardless of imaging modality. These results have implication for neuroprotection trial design, as well as informing triage decisions at primary stroke centers.

Identifiants

pubmed: 37813579
pii: WNL.0000000000207908
doi: 10.1212/WNL.0000000000207908
pmc: PMC10663035
doi:

Types de publication

Multicenter Study Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

e2126-e2137

Informations de copyright

© 2023 American Academy of Neurology.

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Auteurs

Pierre Seners (P)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France. pierre.seners@gmail.com.

Nicole Yuen (N)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Jean-Marc Olivot (JM)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Michael Mlynash (M)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Jeremy J Heit (JJ)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Soren Christensen (S)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

José Bernardo Escribano-Paredes (JB)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Emmanuel Carrera (E)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Davide Strambo (D)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Patrik Michel (P)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Alexander Salerno (A)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Max Wintermark (M)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Hui Chen (H)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Jean-François Albucher (JF)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Christophe Cognard (C)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Igor Sibon (I)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Michael Obadia (M)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Julien Savatovsky (J)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Maarten G Lansberg (MG)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

Gregory W Albers (GW)

From the Stanford Stroke Center (P.S., N.Y., M.M., S.C., G.W.A.), Palo Alto, CA; Neurology Department (P.S., M.O.), Hôpital Fondation A. de Rothschild; Institut de Psychiatrie et Neurosciences de Paris (IPNP) (P.S.), U1266, INSERM, Paris; Acute Stroke Unit (J.M.O., J.-F.A.), Hôpital Pierre-Paul Riquet, CHU Toulouse and CIC 1436, Toulouse University, INSERM, UPS, France; Radiology Department (J.J.H.), Stanford University, Palo Alto, CA; Neurology Department (J.B.E.P., E.C.), Geneva University Hospital, Switzerland; Stroke Center (D.S., P.M., A.S.), Neurology Service, Lausanne University Hospital and University of Lausanne, Switzerland; Neuroradiology Department (M.W., H.C.), MD Anderson Cancer Center, University of Texas, Houston; Neuroradiology Department (C.C.), Toulouse University Hospital; Stroke Unit (I.S., J.S.), Bordeaux University Hospital; and Radiology Department (M.G.L.), Hôpital Fondation A. de Rothschild, Paris, France.

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