The scalp to earlobe montage as standard in routine SEP recording. Comparison with the non-cephalic reference in patients with lesions of the upper cervical cord

Massimiliano Valeriani, Domenico Restuccia, Vincenzo Di Lazzaro, Domenica Le Pera, Carmen Barba, Pietro Tonali

Research output: Contribution to journalArticle

Abstract

We compared scalp somatosensory evoked potential (SEP) recordings by non-cephalic and earlobe reference in 14 healthy subjects and in 5 patients with lesions of the upper cervical cord. In healthy subjects, the scalp to earlobe montage tended to cancel all far-field potentials preceding the scalp P14. On the contrary, the P14 far-field was more difficult to identify in scalp to non-cephalic recordings, because in 12/14 cases it followed another far-field (P13), which was very close in latency to the P14. In 4 patients, the scalp to non-cephalic traces showed a single positive wave (P13/P14 complex) in the P14 latency range. If this complex had been labelled as P14, the somatosensory dysfunction would have been localised above the foramen magnum. On the other hand, the scalp to earlobe recording allowed correct localisation of the lesion since it showed the 'real' and delayed P14 in two patients and no far-field response in the remaining two. Therefore, we propose the use of the scalp to earlobe montage as standard in routine examinations.

Original languageEnglish
Pages (from-to)414-421
Number of pages8
JournalElectroencephalography and Clinical Neurophysiology - Evoked Potentials
Volume108
Issue number4
DOIs
Publication statusPublished - Jul 1998

Keywords

  • Cervical spinal cord
  • Far-field
  • P14
  • SEP

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

Fingerprint Dive into the research topics of 'The scalp to earlobe montage as standard in routine SEP recording. Comparison with the non-cephalic reference in patients with lesions of the upper cervical cord'. Together they form a unique fingerprint.

Cite this