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Related Concept Videos

Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

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Related Experiment Video

Updated: May 21, 2026

Combining Imaging and Electrophysiology to Visualize and Record Spreading Depolarizations in Mice
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Responses to Cortical Spreading Depression under Oxygen Deficiency.

J Sonn1, A Mayevsky

  • 1The Mina & Everard Goodman, Faculty of Life Sciences and Leslie and Susan Gonda Multidisciplinary Brain Research Center, Bar-Ilan University RAMAT-GAN 52900, Israel.

The Open Neurology Journal
|June 7, 2012
PubMed
Summary

Cortical spreading depression (CSD) disrupts brain oxygen balance, increasing oxygen demand and impairing supply during pathological conditions. Brain oxygenation is critical for CSD response.

Keywords:
Brain oxygenationcerebral blood flowextracellular K+hypoxiamitochondrial NADHnitric oxide synthase inhibitionpartial ischemia.

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Area of Science:

  • Neuroscience
  • Physiology
  • Biochemistry

Background:

  • Cortical spreading depression (CSD) is a wave of neuronal and glial depolarization that spreads across the cerebral cortex.
  • Understanding the physiological consequences of CSD under various pathological conditions is crucial for neurological research.

Purpose of the Study:

  • To investigate the impact of CSD on extracellular potassium ([K(+)](e)), cerebral blood flow (CBF), mitochondrial NADH redox state, and direct current (DC) potential.
  • To compare these effects during normoxia and under pathological conditions including hypoxia, nitric oxide synthase (NOS) inhibition (L-NAME), and partial ischemia.

Main Methods:

  • Utilized a specialized multi-parameter analyzer (MPA) for simultaneous monitoring of CSD wave propagation.
  • Measured mitochondrial NADH redox state (fluorometry), DC potential (Ag/AgCl electrodes), CBF (laser Doppler flowmetry), and [K(+)](e) (mini-electrode).

Main Results:

  • CSD induced an initial increase in NADH and decreased CBF during normoxia and pathological states, indicating an oxygen supply-demand imbalance.
  • The hyperperfusion phase of CBF was attenuated during hypoxia and ischemia, suggesting further oxygen supply reduction.
  • CSD wave duration increased under pathological conditions, pointing to disturbed energy production.
  • [K(+)](e) levels rose identically during CSD in all conditions, signifying increased oxygen demand.

Conclusions:

  • Brain oxygenation is a critical determinant of the brain's response to CSD.
  • The MPA device facilitated differentiation of simultaneous parameter responses, highlighting altered interrelations between oxygen demand, supply, and balance during CSD.
  • Pathological conditions exacerbate the metabolic and hemodynamic disturbances associated with CSD.