Abstract

Background: Management of Chiari I is controversial, in part because there is no widely used quantitative measurement of decompression. It has been demonstrated that brainstem auditory evoked responses (BAER) and somatosensory evoked potentials (SSEP) have decreased conduction latencies after wide craniectomy. We analyzed these parameters in a suboccipital craniectomy/craniotomy procedure. Methods: Thirteen consecutive patients underwent suboccipital decompression for treatment of symptomatic Chiari I. Craniectomy was restricted to the inferior aspect of the nuchal line, and in most cases the bone flap was replaced. Neuronal conduction was monitored continuously with median nerve somatosensory evoked potentials (M-SEP), posterior tibial nerve somatosensory evoked potentials (T-SEP), BAER, or a combination. The M-SEP N20, T-SEP P37, and BAER V latencies were recorded at four milestones - preoperatively, following craniotomy, following durotomy, and following closure. Results: Five males and eight females, with average age of 9 years, were studied. Clinical improvement was noted in all 13 patients. M-SEP N20 latency decreased from a mean of 18.55 at baseline to 17.75 ms after craniotomy ( P = 0.01); to 17.06 ms after durotomy ( P = 0.01); and to 16.68 ms after closing ( P = 0.02). T-SEP P37 latency did not change significantly. BAER V latency decreased from a mean of 6.25 ms at baseline to 6.14 ms after craniotomy ( P = 0.04); to 5.98 ms after durotomy ( P = 0.01); and to 5.95 ms after closing ( P = 0.45). Conclusion: Significant improvements in conduction followed both craniectomy and durotomy. Bone replacement did not affect these results.

Details

Title
Suboccipital craniotomy for Chiari I results in evoked potential conduction changes
Author
Chen, Jason; Coutin-Churchman, Pedro; Nuwer, Marc; Lazareff, Jorge
Pages
165-165
Publication year
2012
Publication date
2012
Publisher
Scientific Scholar
ISSN
21527806
e-ISSN
22295097
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
1286964652
Copyright
Copyright Medknow Publications & Media Pvt Ltd Jan 2012