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Interstitial and tissue cations and electrical potential after experimental spinal cord injury
1Laboratorium voor Normale en Pathologische Fysiologie, Universiteit Gent, Universitair Ziekenhuis, Belgium.
Experimental Brain Research
|January 1, 1994
Summary
Spinal cord contusion injury causes rapid, reversible shifts in interstitial ions and electrical potential. Flunarizine treatment improved recovery rates, suggesting calcium
Area of Science:
- Neuroscience
- Physiology
- Biochemistry
Background:
- Spinal cord injury (SCI) leads to complex ionic and electrical changes.
- Understanding early ionic shifts is crucial for developing effective treatments.
Purpose of the Study:
- To investigate interstitial and tissue cation changes and electrical potential shifts following spinal cord contusion injury.
- To evaluate the effect of flunarizine on these post-injury changes and recovery.
Main Methods:
- Experimental model of spinal cord contusion injury in anesthetized cats.
- Measurement of interstitial ion activity using ion-selective electrodes.
- Measurement of tissue ion content using flame photometry.
- Administration of calcium entry blocker flunarizine prior to injury.
Main Results:
- Post-injury, a decrease in interstitial sodium and calcium, an increase in potassium, and a negative electrical potential shift were observed.
- Tissue analysis revealed increased sodium and calcium and decreased potassium.
- Flunarizine treatment did not alter the initial calcium decrease but accelerated recovery of interstitial calcium and electrical potential.
Conclusions:
- Early ionic shifts suggest a net movement towards the intracellular space, potentially contributing to edema.
- Flunarizine-sensitive mechanisms may play a role in the recovery of interstitial calcium and electrical potential post-injury.
- Calcium ions might be involved in the recovery of electrical potential after SCI.