Relationship between the states of spinal impact injuries and magnetically evoked EMGs in rats.

Abstract:

:The relationship between the states of spinal impact injuries and magnetically evoked electromyograms (EMGs) were studied in rats. Impact injuries to the spinal cord were induced at a depth of 0.25-2.0 mm by insertion of a cylinder tip measuring 2 mm in diameter into the lumbar vertebrae L1-L2. Magnetically induced electromyograms for the brain and lumbar vertebrae L4-L5 were recorded from the tibialis anticus and the gastrocnemius muscles. H-reflex was not induced by the spinal cord injury (SCI) at a depth of 0.25 mm, although motor evoked potential (MEP) was observed. Continuous waves following the M-response were observed in the SCI at a depth of 0.25 mm. Elevation of the threshold, reduction of its latency and decrease in amplitude of the M-responses were observed at an injury depth of 0.5 mm or deeper. With SCI magnitude from mild (0.5 mm depth) to severe (1.0 mm depth), the amplitudes of the M-response were decreased, and the latency of the M-response was shorter than that of the control. The F-response was accelerated in severe SCI. Our results indicated that there was a relationship between extensive injury legions and the H-reflex F- and M-responses in magnetically evoked EMGs. Magnetically evoked EMGs are useful for monitoring the states of SCI.

journal_name

Neurol Res

journal_title

Neurological research

authors

Chiba A,Hiruma S,Hashimoto S,Inase M

doi

10.1080/01616412.2000.11740747

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

727-32

issue

7

eissn

0161-6412

issn

1743-1328

journal_volume

22

pub_type

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