Ischemia-induced depolarizations and associated hemodynamic responses in incomplete global forebrain ischemia in rats

Z. Bere, T. P. Obrenovitch, F. Bari, E. Farkas

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19 Citations (Scopus)

Abstract

Spontaneous depolarizations around the core are a consistent feature of focal cerebral ischemia, but the associated regional hemodynamic changes are heterogeneous. We determined how the features of depolarizations relate to subsequent cerebral blood flow (CBF) changes in global forebrain ischemia. Forebrain ischemia was produced in halothane-anesthetized rats (n= 13) by common carotid artery occlusion and hypovolemic hypotension. Mean arterial blood pressure (MABP) was monitored via a femoral catheter. Specific illuminations allowed the capture of image sequences through a cranial window to visualize: changes in membrane potential (voltage-sensitive dye method); CBF (laser speckle contrast imaging); cerebral blood volume (intrinsic optical signal, IOS at 540-550. nm); and hemoglobin deoxygenation (IOS at 620-640. nm).A depolarization occurred (n= 9) when CBF fell below 43.4 ± 5% of control (41 ± 4. mmHg MABP), and propagated with a distinct wave front at a rate of 2.8. mm/min. Depolarizations were either persistent (n= 4), intermediate (n= 3) or short, transient depolarization (n= 2). Persistent and intermediate depolarizations were associated with sustained hypoperfusion (-11.7 ± 5.1%) and transient hypoperfusion (-17.4 ± 5.2, relative to CBF before depolarization). Short, transient depolarizations did not generate clear CBF responses. Depolarizations during incomplete global ischemia occurred at the lower limit of CBF autoregulation, propagated similar to spreading depolarization (SD), and the hemodynamic responses indicated inverse neurovascular coupling. Similar to SDs associated with focal stroke, the propagating event can be persistent or transient.

Original languageEnglish
Pages (from-to)217-226
Number of pages10
JournalNeuroscience
Volume260
DOIs
Publication statusPublished - Feb 28 2014

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Keywords

  • Cerebral blood flow
  • Global ischemia
  • Imaging
  • Neurovascular coupling
  • Spreading depolarization

ASJC Scopus subject areas

  • Neuroscience(all)

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