Effect of low-intensity 50-Hz magnetic fields on kindling acquisition and fully kindled seizures in rats

The possibility that chronic exposure to power-line frequency (50 Hz) magnetic fields (MFs) might affect the acquisition or characteristics of focal and generalized seizures in amygdala kindled rats was studied. Acute, short-lasting 50-Hz MF exposure of fully kindled rats at either 1 or 100 μT had n...

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Bibliographic Details
Published in:Brain research 1998-11, Vol.809 (2), p.269-276
Main Authors: Potschka, Heidrun, Thun-Battersby, Susanne, Löscher, Wolfgang
Format: Article
Language:English
Subjects:
Amygdala - physiopathology
Animals
Anticonvulsant
Biological and medical sciences
Electric Stimulation
Electromagnetic field
Electromagnetic Fields
Epilepsy
Epilepsy - physiopathology
Female
Headache. Facial pains. Syncopes. Epilepsia. Intracranial hypertension. Brain oedema. Cerebral palsy
Kindling, Neurologic - physiology
Medical sciences
Microelectrodes
Nervous system (semeiology, syndromes)
Neurology
Rats
Rats, Wistar
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Summary:The possibility that chronic exposure to power-line frequency (50 Hz) magnetic fields (MFs) might affect the acquisition or characteristics of focal and generalized seizures in amygdala kindled rats was studied. Acute, short-lasting 50-Hz MF exposure of fully kindled rats at either 1 or 100 μT had no effect on afterdischarge threshold (ADT) or seizure parameters recorded at ADT. In the chronic experiments, rats with electrodes implanted in the basolateral amygdala were exposed to a 50-Hz, 100-μT (1 Gauss) MF or to a sham field condition before and after onset of daily electrical stimulations over the whole period of kindling development. The focal seizure threshold (ADT) was determined before and after kindling development in MF exposed and sham exposed rats. Pre-kindling ADT was significantly increased by MF exposure. Exposed rats needed about the same number of stimulations to kindle than sham exposed rats, but the cumulative afterdischarge duration to reach criterion (i.e., a stage 5 seizure) was significantly reduced in MF exposed animals. Post-kindling ADT was similar in the two groups, but MF exposed rats showed a significantly higher threshold for generalized seizures. The data indicate that chronic exposure of rats to a 50-Hz, 100-μT MF exerts weak inhibitory effects on some seizure parameters of the kindling model.
ISSN:0006-8993
1872-6240
DOI:10.1016/S0006-8993(98)00919-6