Time jitter of somatosensory evoked potentials in recovery from hypoxic-ischemic brain injury

Ying Ma, Yong Hu, Nicolas Valentin, Romergryko G. Geocadin, Nitish V. Thakor, Xiaofeng Jia

Research output: Contribution to journalArticlepeer-review

Abstract

Impaired neural conductivity shown by delayed latency and reduced amplitude of characteristic peaks in somatosensory evoked potentials (SSEPs), has been used to monitor hypoxic-ischemic brain injury after cardiac arrest (CA). However, rather than characteristic peak deferral and suppression, the time jitter of the peak in SSEP related with time-variant neurological abnormalities is diminished by the commonly used ensemble average method. This paper utilizes the second order blind identification (SOBI) technique to extract characteristic peak information from one trial of SSEPs. Sixteen male Wistar rats were subjected to 7 or 9. min of asphyxial CA (n= 8 per group). The SSEPs from median nerve stimulation were recorded for 4. h after CA and then for 15. min periods at 24, 48 and 72. h. Neurological outcomes were evaluated by neurologic deficit score (NDS) at 72. h post-CA. The SSEP signal was analyzed offline with SOBI processing in Matlab. The N10 feature of SSEP was compared between good (NDS ≥ 50) and bad (NDS < 50) outcomes. After processed by SOBI, the N10 detection rate was significantly increased (p< 0.001) from 90. min post-CA. Statistical difference of the latency variance of the N10 between good and bad outcome groups existed at 24, 48 and 72. h post-CA (p≤ 0.001). Our study is the first application using SOBI detecting variance in neural signals like SSEP. N10 latency variance, related with neurophysiological dysfunction, increased after hypoxic-ischemic injury. The SOBI technique is an efficient method in the identification of peak detection and offers a favorable alternative to reveal the neural transmission variation.

Original languageEnglish (US)
Pages (from-to)355-360
Number of pages6
JournalJournal of Neuroscience Methods
Volume201
Issue number2
DOIs
StatePublished - Oct 15 2011

Keywords

  • Cardiac arrest
  • Electrophysiology
  • Second order blind identification
  • Somatosensory evoked potentials
  • Variance

ASJC Scopus subject areas

  • Neuroscience(all)

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