Abstract
Objectives
Collateral blood flow is accepted as a predictive factor of tissue fate in ischemic stroke. Thus, we aimed to evaluate a new method derived from MR perfusion source images to assess collateral flow in patients with ICA/MCA occlusions.
Methods
A total of 132 patients of the prospective 1000+ study were examined. MR perfusion source images were assessed according to Δimg_n = img_n + 1 − img_n − 1 using the five-grade Higashida collateral flow rating system. Higashida scores were correlated to mismatch (MM) volume, mismatch ratio, day 6 FLAIR lesion volumes and day 90 mRS.
Results
Patients with Higashida scores 3 and 4 had significantly lower admission NIHSS, smaller FLAIR day 6 lesion volumes (p < 0.001) and higher rates of better long-term outcome (mRS 0–2, p = 0.002). There was a linear trend for the association of Higashida grade 1 (p = 0.002) and 2 (p = 0.001) with unfavourable outcome (day 90 mRS 3–6), but no significant association was found for MM volume, MM ratio and day 90 mRS. Inter-rater agreement was 0.58 (95 % CI 0.43–0.73) on day 1, 0.70 (95 % CI 0.58–0.81) on day 2.
Conclusion
sMRP-SI Higashida score offers a non-invasive collateral vessel and tissue perfusion assessment of ischemic tissue. The predictive value of Higashida rating proved superior to MM with regard to day 90 mRS.
Key points
• Assessment of collateral flow using subtracted dynamic MR perfusion source imaging (sMRP-SI).
• sMRP-SI offers additional information about morphological characteristics of ischemic brain tissue.
• sMRP-SI collateral flow assessment proves superior to mismatch volume.
• Better collateral flow was significantly associated with better outcome (day 90 mRS).
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Abbreviations
- ASITN/SIR:
-
American Society of Interventional and Therapeutic Neuroradiology/Society of Radiology collateral flow grading system
- DWI:
-
diffusion weighted imaging
- FLAIR:
-
fluid attenuated inversion recovery
- HIR:
-
hypoperfusion intensity ratio
- ICA:
-
internal carotid artery
- iv:
-
intravenous
- MCA:
-
middle cerebral artery
- MM:
-
mismatch
- ml:
-
millilitre
- MRA:
-
magnetic resonance angiography
- mRS:
-
modified Rankin scale
- NIHSS:
-
National Institutes of Health stroke scale score
- PI:
-
perfusion imaging
- s:
-
seconds
- sMRP-SI:
-
subtracted dynamic MR perfusion source imaging
- TIMI:
-
thrombolysis in myocardial infarction
- TR:
-
repetition time
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Acknowledgments
We thank Anna Kufner for critical language revision of the manuscript. The scientific guarantor of this publication is PD Dr. Jochen Fiebach. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. Jochen B. Fiebach reports receiving consulting, lecture and advisory board fees from BMS, Siemens, Perceptive, Synarc, BioImaging Technologies, Novartis, Wyeth, Pfizer, Boehringer Ingelheim, Lundbeck and Sygnis
This study received funding from the Federal Ministry of Education and Research via the grant Center for Stroke Research Berlin (01EO0801 and 01EO01301). Dr. Ulrike Grittner kindly provided statistical advice for this manuscript. Institutional review board approval was obtained (EA4/026/08). Written informed consent was obtained from all subjects (patients) in this study. Some study subjects or cohorts have been previously presented at the International Stroke Conference, San Diego, 2014 as an oral presentation. Methodology: prospective, retrospective, observational, performed at one institution.
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Villringer, K., Serrano-Sandoval, R., Grittner, U. et al. Subtracted Dynamic MR Perfusion Source Images (sMRP-SI) provide Collateral Blood Flow Assessment in MCA Occlusions and Predict Tissue Fate. Eur Radiol 26, 1396–1403 (2016). https://doi.org/10.1007/s00330-015-3927-5
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DOI: https://doi.org/10.1007/s00330-015-3927-5