✦ LIBER ✦

Improved methodology for lumbosacral nerve root stimulation

✍ Scribed by Walter Troni; Chiara Bianco; Mario Coletti Moja; Michele Dotta

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 853 KB
Volume: 19
Category: Article
ISSN: 0148-639X
DOI: 10.1002/(sici)1097-4598(199605)19:5<595::aid-mus7>3.0.co;2-6

No coin nor oath required. For personal study only.

✦ Synopsis

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 lowthresholds afferent component, near its exit from the intervertebral foramina, or even more distally. Normal values for conduction velocity in motor and 1 a afferent fibers in the proximal nerve tract are provided.

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