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Improved methodology for lumbosacral nerve root stimulation
Author(s) -
Troni Walter,
Bianco Chiara,
Moja Mario Coletti,
Dotta Michele
Publication year - 1996
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/(sici)1097-4598(199605)19:5<595::aid-mus7>3.0.co;2-6
Subject(s) - anatomy , stimulation , lumbosacral joint , lumbar , nerve root , nerve conduction velocity , sciatic nerve , medicine , biology , neuroscience
The site of S1–S2 root activation following percutaneous high‐voltage electrical (ES) and magnetic stimulation were located by analyzing the variations of the time interval from M to H soleus responses elicited by moving the stimulus point from lumbar to low thoracic levels. ES was effective in activating S1–S2 roots at their origin. However, supramaximal motor root stimulation required a dorsoventral montage, the anode being a large, circular surface electrode placed ventrally, midline between the apex of the xiphoid process and the umbilicus. Responses to magnetic stimuli always resulted from the activation of a fraction of the fiber pool, sometimes limited to the low‐thresholds afferent component, near its exit from the intervertebral foramina, or even more distally. Normal values for conduction velocity in motor and 1a afferent fibers in the proximal nerve tract are provided. © 1996 John Wiley & Sons, Inc.