Argon Inhalation for 24 Hours After Onset of Permanent Focal Cerebral Ischemia in Rats Provides Neuroprotection and Improves Neurologic Outcome

Shuang Ma, Dongmei Chu, Litao Li, Jennifer A. Creed, Yu Mi Ryang, Huaxin Sheng, Wei Yang, David S. Warner, Dennis A. Turner, Ulrike Hoffmann

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Objectives: We tested the hypothesis that prolonged inhalation of 70% argon for 24 hours after in vivo permanent or temporary stroke provides neuroprotection and improves neurologic outcome and overall recovery after 7 days. Design: Controlled, randomized, double-blinded laboratory study. Setting: Animal research laboratories. Subjects: Adult Wistar male rats (n = 110). Interventions: Rats were subjected to permanent or temporary focal cerebral ischemia via middle cerebral artery occlusion, followed by inhalation of 70% argon or nitrogen in 30% oxygen for 24 hours. On postoperative day 7, a 48-point neuroscore and histologic lesion size were assessed. Measurements and Main Results: After argon inhalation for 24 hours immediately following "severe permanent ischemia" induction, neurologic outcome (neuroscore, p = 0.034), overall recovery (body weight, p = 0.02), and infarct volume (total infarct volume, p = 0.0001; cortical infarct volume, p = 0.0003; subcortical infarct volume, p = 0.0001) were significantly improved. When 24-hour argon treatment was delayed for 2 hours after permanent stroke induction or until after postischemic reperfusion treatment, neurologic outcomes remained significantly improved (neuroscore, p = 0.043 and p = 0.014, respectively), as was overall recovery (body weight, p = 0.015), compared with nitrogen treatment. However, infarct volume and 7-day mortality were not significantly reduced when argon treatment was delayed. Conclusions: Neurologic outcome (neuroscore), overall recovery (body weight), and infarct volumes were significantly improved after 24-hour inhalation of 70% argon administered immediately after severe permanent stroke induction. Neurologic outcome and overall recovery were also significantly improved even when argon treatment was delayed for 2 hours or until after reperfusion.

Original languageEnglish (US)
Pages (from-to)E693-E699
JournalCritical care medicine
Volume47
Issue number8
DOIs
StatePublished - Aug 1 2019
Externally publishedYes

Keywords

  • argon
  • neuroprotection
  • noble gases
  • permanent cerebral ischemia
  • rats

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine

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