Postoperative cauda equina syndrome in patients undergoing single-level lumbar microdiscectomy. Report of two cases.

Abstract:

:Cauda equina syndrome is a well-documented complication of uneventful lumbar microdiscectomy. In the vast majority of cases, no radiological explanation can be obtained. In this paper, the authors report two cases of postoperative cauda equina syndrome in patients undergoing single-level de novo lumbar microdiscectomy in which intraoperative electrophysiological monitoring was used. In both patients, the amplitudes of cortical and subcortical intraoperative somatosensory evoked potentials (SSEPs) abruptly decreased during discectomy and foraminotomy. In the first patient, a slow, partial improvement of SSEPs was observed before the end of the operation, whereas no improvement was observed in the second patient. In the first case, clinical findings consistent with cauda equina syndrome were seen immediately postoperatively, whereas in the second one the symptoms developed within 1.5 hours after the procedure. Postoperative magnetic resonance images obtained in both patients, and a lumbar myelogram obtained in the second one revealed no signs of conus medullaris or nerve root compression. Both patients showed marked improvement after an intense course of rehabilitation. The authors' findings support the proposition that intraoperative SSEP monitoring may be useful in predicting the development of cauda equina syndrome in patients undergoing lumbar microdiscectomy. Nevertheless, further prospective clinical studies are necessary for validation of these findings.

journal_name

Neurosurg Focus

journal_title

Neurosurgical focus

authors

Dimopoulos V,Fountas KN,Machinis TG,Feltes C,Chung I,Johnston K,Robinson JS,Grigorian A

doi

10.3171/foc.2005.19.2.12

subject

Has Abstract

pub_date

2005-08-15 00:00:00

pages

E11

issue

2

issn

1092-0684

pii

190211

journal_volume

19

pub_type

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