71 (4) 256-267

Title: 
A NEW NEUROLOGICAL EXAMINATION METHOD IN THE HORSE: MAGNETIC TRANSCRANIAL STIMULATION
Author(s): 
H. Nollet, P. Deprez, K. Vanschandevijl, L. Lefere, F. Verschooten, L. Van Ham, R. Ducatelle, G. Vanderstraeten
Abstract: 

In this paper we report the application of a new, non-invasive, objective, painless and sensitive neurological test method in the horse. After transcranial stimulation of the motor cortex of the brain, using a changing magnetic field, the evoked potentials are registered electromyographically and measured. The technique was first applied in eightteen normal horses in order to obtain reference values. Thereafter, the usefulness of transcranial magnetic stimulation was investigated in eight neurological cases, as a complementary and objective diagnostic method in the neurological examination of the horse.We conclude that magnetic transcranial stimulation can put the diagnostic examination of horses with abnormal gait into a new perspective. The method is complementary the clinical neurological examination. In cases of severe ataxia the magnetic potentials determined in the present study correlated well with the clinical signs. In horses with subtle signs of ataxia, or when the nature of the affection as a purely orthopedic problem is not clearly evident, the lesions along the motor tracts can be assessed adequately, even in acute cases. In these cases the neurological lesions can be located with certainty, thus allowing the use of more specific ancillary tests (radiography, serum biochemistry, etc.). A supplementary advantage is that by measuring the onset latency and amplitude, an evolution in time can be followed objectively.

Full text: 
pp 256-267
Original article(s)