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Neurol."],"abstract":"<jats:p><jats:bold>Background:<\/jats:bold> As not all ischemic stroke patients benefit from currently available treatments, there is considerable need for neuroprotective co-therapies. Therapeutic hypothermia is one such co-therapy, but numerous issues have hampered its clinical use (e.g., pneumonia risk with whole-body cooling). Some problems may be avoided with brain-specific methods, such as intra-arterial selective cooling infusion (IA-SCI) into the arteries supplying the ischemic tissue.<\/jats:p><jats:p><jats:bold>Objective:<\/jats:bold> Our research question was about the efficacy of IA-SCI in animal middle cerebral artery occlusion models. We hypothesized that IA-SCI would be beneficial, but translationally-relevant study elements may be missing (e.g., aged animals).<\/jats:p><jats:p><jats:bold>Methods:<\/jats:bold> We completed a systematic review of the PubMed database following the PRISMA guidelines on May 21, 2020 for animal studies that administered IA-SCI in the peri-reperfusion period and assessed infarct volume, behavior (primary meta-analytic endpoints), edema, or blood-brain barrier injury (secondary endpoints). Our search terms included: \u201cfocal ischemia\u201d and related terms, \u201cIA-SCI\u201d and related terms, and \u201canimal\u201d and related terms. Nineteen studies met inclusion criteria. We adapted a methodological quality scale from 0 to 12 for experimental design assessment (e.g., use of blinding\/randomization, <jats:italic>a priori<\/jats:italic> sample size calculations).<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold> Studies were relatively homogenous (e.g., all studies used young, healthy animals). Some experimental design elements, such as blinding, were common whereas others, such as sample size calculations, were infrequent (median methodological quality score: 5; range: 2\u20137). Our analyses revealed that IA-SCI provides benefit on all endpoints (mean normalized infarct volume reduction = 23.67%; 95% CI: 19.21\u201328.12; mean normalized behavioral improvement = 35.56%; 95% CI: 25.91\u201345.20; mean standardized edema reduction = 0.95; 95% CI: 0.56\u20131.34). Unfortunately, blood-brain barrier assessments were uncommon and could not be analyzed. However, there was substantial statistical heterogeneity and relatively few studies. Therefore, exploration of heterogeneity <jats:italic>via<\/jats:italic> meta-regression using saline infusion parameters, study quality, and ischemic duration was inconclusive.<\/jats:p><jats:p><jats:bold>Conclusion:<\/jats:bold> Despite convincing evidence of benefit in ischemic stroke models, additional studies are required to determine the scope of benefit, especially when considering additional elements (e.g., dosing characteristics). As there is interest in using this treatment alongside current ischemic stroke therapies, more relevant animal studies will be critical to inform patient studies.<\/jats:p>","DOI":"10.3389\/fneur.2020.588479","type":"journal-article","created":{"date-parts":[[2021,1,6]],"date-time":"2021-01-06T04:39:01Z","timestamp":1609907941000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["A Systematic Review and Meta-Analysis of Animal Studies Testing Intra-Arterial Chilled Infusates After Ischemic Stroke"],"prefix":"10.3389","volume":"11","author":[{"given":"Lane J.","family":"Liddle","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christine A.","family":"Dirks","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brittany 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