Observations of the posterior tibial nerve SEP of patients requiring extradural spinal surgery.
The cortical potentials evoked by posterior tibial nerve stimulation were examined in a series of 141 hospital patients requiring extradural spinal surgery. One hundred and five patients were neurologically intact, while in 36 some deficit was present. In the intact subjects, the absolute latencies of the main medium-latency peaks (N30, P40, N50, P60) were found to vary with height and age. There were no additional gender-related differences. The latencies of the deficit group were longer than those of the intact group but only marginally useful as a clinical discriminator; their amplitudes were not significantly lower than those of the intact group. A model for variations in SEP latency is suggested.
Guthkelch
A N
AN
Department of Surgery, (Section of Neurosurgery), College of Medicine, University of Arizona.
Bamford
C R
CR
Gaines
J A
JA
Dzioba
R B
RB
D000367:Age Factors; D001827:Body Height; D016002:Discriminant Analysis; D004576:Electromyography; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011930:Reaction Time; D012737:Sex Factors; D013118:Spinal Cord Diseases / Q000503:physiopathology; D013122:Spinal Diseases / Q000503:physiopathology / Q000601:surgery*; D013979:Tibial Nerve / Q000502:physiology*