Variance of Latency and Amplitude in SEPs Monitored During Spinal Operations with and Without Cord Manipulation
Variability in amplitude and latency after median nerve, peroneal nerve and cauda equina stimulation has been evaluated in both healthy and diseased and manipulated and non-manipulated cords using the paired t-test. Three periods during operation were compared in individual cases. It could be demonstrated that amplitudes are more variable than latencies, that variability increases towards the end of the procedure and that variability is larger in diseased and manipulated cords than in healthy non-diseased cords. Cauda equina stimulation yielded relatively little variability in patients with manipulated spinal cords, similar to the variability after median nerve stimulation in healthy persons.
KeywordsSpinal Cord Nerve Stimulation Spinal Operation Peroneal Nerve Spinal Cord Lesion
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