Intraoperative electrophysiology during single-level selective dorsal rhizotomy: technique, stimulation threshold, and response data in a series of 145 patients

Author:

De Vloo Philippe12,Huttunen Terhi J.1,Forte Dalila1,Jankovic Ivana3,Lee Amy3,Hair Mark3,Cawker Stephanie4,Chugh Deepti4,Carr Lucinda4,Crowe Belinda H. A.4,Pitt Matthew3,Aquilina Kristian1

Affiliation:

1. Departments of Neurosurgery,

2. Department of Neurosurgery, University Hospitals Leuven, Belgium

3. Neurophysiology, and

4. Neurodisability, Great Ormond Street Hospital for Children, London, United Kingdom; and

Abstract

OBJECTIVESelective dorsal rhizotomy (SDR) is effective at permanently reducing spasticity in children with spastic cerebral palsy. The value of intraoperative neurophysiological monitoring in this procedure remains controversial, and its robustness has been questioned. This study describes the authors’ institutional electrophysiological technique (based on the technique of Park et al.), intraoperative findings, robustness, value to the procedure, and occurrence of new motor or sphincter deficits.METHODSThe authors analyzed electrophysiological data of all children who underwent SDR at their center between September 2013 and February 2019. All patients underwent bilateral SDR through a single-level laminotomy at the conus and with transection of about 60% of the L2–S2 afferent rootlets (guided by intraoperative electrophysiology) and about 50% of L1 afferent roots (nonselectively).RESULTSOne hundred forty-five patients underwent SDR (64% male, mean age 6 years and 7 months, range 2 years and 9 months to 14 years and 10 months). Dorsal roots were distinguished from ventral roots anatomically and electrophysiologically, by assessing responses on free-running electromyography (EMG) and determining stimulation thresholds (≥ 0.2 mA in all dorsal rootlets). Root level was determined anatomically and electrophysiologically by assessing electromyographic response to stimulation. Median stimulation threshold was lower in sacral compared to lumbar roots (p < 0.001), and 16% higher on the first operated (right) side (p = 0.023), but unrelated to age, sex, or functional status. Similarly, responses to tetanic stimulation were consistent: 87% were graded 3+ or 4+, with similar distributions between sides. This was also unrelated to age, sex, and functional status. The L2–S2 rootlets were divided (median 60%, range 50%–67%), guided by response to tetanic stimulation at threshold amplitude. No new motor or sphincter deficits were observed, suggesting sparing of ventral roots and sphincteric innervation, respectively.CONCLUSIONSThis electrophysiological technique appears robust and reproducible, allowing reliable identification of afferent nerve roots, definition of root levels, and guidance for rootlet division. Only a direct comparative study will establish whether intraoperative electrophysiology during SDR minimizes risk of new motor or sphincter worsening and/or maximizes functional outcome.

Publisher

Journal of Neurosurgery Publishing Group (JNSPG)

Subject

General Medicine

Reference90 articles.

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4. Sectorial posterior rhizotomy, a new technique of surgical treatment for spasticity;Privat;Acta Neurochir (Wien),1976

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