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Quantification of Neurovascular Protection Following Repetitive Hypoxic Preconditioning and Transient Middle Cerebral Artery Occlusion in Mice
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Hyperbaric oxygen induces rapid protection against focal cerebral ischemia

Roland Veltkamp1, Dirk A Siebing, Sabine Heiland

  • 1Department of Neurology, Ruprecht-Karls-University Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany. roland_veltkamp@med.uni-heidelberg.de

Brain Research
|March 22, 2005
PubMed
Abstract

Insights

Hyperbaric oxygen (HBO) therapy offers immediate brain protection following cerebral ischemia, significantly reducing lesion volume and infarct size compared to normobaric oxygen. This study monitored early in vivo effects using repetitive MRI.

Area of Science:

  • Neuroscience
  • Hyperbaric Medicine
  • Cerebrovascular Research

Background:

  • The protective mechanisms and timing of hyperbaric oxygen (HBO) in cerebral ischemia are not fully understood.
  • Early in vivo effects of HBO following transient focal cerebral ischemia require further elucidation.

Purpose of the Study:

  • To monitor the early in vivo effects of hyperbaric oxygen (HBO) therapy after transient focal cerebral ischemia using repetitive magnetic resonance imaging (MRI).
  • To investigate the protective potential of HBO in reducing brain damage after middle cerebral artery occlusion (MCAO).

Main Methods:

  • Wistar rats underwent transient focal cerebral ischemia induced by middle cerebral artery occlusion (MCAO).
  • Rats received hyperbaric oxygen (HBO) therapy at 3.0 atmospheres absolute (ata) or normobaric oxygen (1.0 ata) for 1 hour, starting 40 minutes after MCAO.
  • Diffusion-weighted imaging (DWI), perfusion-weighted imaging (PWI), and T2-weighted MRI were performed at multiple time points during reperfusion to assess lesion volume and apparent diffusion coefficient (ADC) values.

Main Results:

  • HBO therapy significantly reduced the volume of abnormal diffusion-weighted signal immediately after reperfusion.
  • HBO treatment led to a significant reduction in T2-weighted lesion size and histological infarct volume at 24 hours post-ischemia.
  • Mean ADC values were lower and T2 values were higher in the ischemic hemisphere of the control group, indicating greater tissue damage compared to the HBO group.

Conclusions:

  • High-dose intraischemic hyperbaric oxygen (HBO) therapy provides immediate and significant neuroprotection following cerebral ischemia.
  • The protective effect of HBO is superior to that of normobaric oxygen in mitigating brain damage after focal ischemia.

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