Involvement of the central nervous system in vibration syndrome
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Somatosensory evoked potential
Auditory brainstem response
Monitoring the brain function of comatose patients caused by brain injury can predict clinic outcome and direct therapy. Combined brainstem auditory evoked potential(BAEP) and Somatosensory evoked potential (SSEP) can explain the function from brainstem to cerebral cortex. The studies aimed to conclude the clinic use of BAEP and SSEP.
Key words:
Brain injury; Brainstem auditory evoked potential; Somatosensory evoked potential; Coma
Somatosensory evoked potential
Coma (optics)
Evoked potential
Brain Function
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Objective To observe the influence of operative injury near brainstem on auditory brainstem evoked potentials (BAEP) and somatosensory evoded potentials(SEP), in order to find sensitive eletrophysiological indexes for neurofunction injury.Methods The 23 patients were monitored continuously during brainstem operation with BAEP,SEP.Results The operation in or near brainstem could induce the change of BAEP and SEP. The parameters changed significantly during intraoperation evoked potentials monitoring were N20 wave and N13 N20 central conduction time (CCT) in SEP, V peak latency, Ⅲ Ⅴ,Ⅰ Ⅴ interpeak latency in BAEP respectively.Conclusions It is important to monitor evoked potentials in brainstem operation surgery.
Somatosensory evoked potential
Evoked potential
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The long-term effects for the neural activities on somatosensory area caused by transcranial direct current stimulation (tDCS) have been showed with somatosensory evoked potentials (SEPs) and high frequency oscillations (HFOs) in animals and humans. This study investigates the relationship of SEPs with HFOs before and after applying cathodal tDCS (0, 15, 30, 45, 60 min) to human left somatosensory cortex for 15 min at 2 mA. The amplitudes of N20 and P30 evoked by right median nerve stimulation were slightly decreased after cathodal tDCS. Likewise, HFOs were affected by cathodal tDCS but there weren't steadily decrement during the entire HFO, the effects were oscillating depending on the peak of HFOs or the elapse time after tDCS. tDCS may leave the different influences between time- and location-dependent somatosensory processing.
Somatosensory evoked potential
Transcranial Direct Current Stimulation
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Objective
To investigate the effects of somatosensory evoked potential (SEP), brainstem auditory evoked potential (BAEP) and event-related potential (P300) on the prognosis of patients with persistent vegetative state (PVS).
Methods
SEP, BAEP, and P300 were detected in PVS patients and the relationship with the Glasgow Coma Scale (GCS) was analyzed in the study.
Results
Study results of the 35 cases with PVS showed that the latency of P300 in the poor prognosis group (424.00±51.39 ms) was significantly longer than that(374.00±67.92 ms) in the good prognosis group, and statistical significance could be seen, when comparisons were made between them (P<0.05). There was no significant difference in the amplitude of P300 between the poor and good prognosis groups (P<0.05). There was no statistical significance between the poor and good prognosis groups in the presence and absence of N20 (one side or both sides), and statistical significance could neither be seen in the amplitude and latency, when comparisons were made between the poor and good prognosis groups (P<0.05). The BAEP of the 35 patients all showed moderate to severe abnormality, but there was no statistical significance in the relationship between BAEP grades and prognosis (P<0.05).
Conclusion
P300 latency could be used as an indicator in the prediction of prognosis for those patients with persistent vegetative state.
Key words:
Somatosensory evoked potential; Brainstem auditory evoked potential; Event-related potential; Persistent vegetative state; Prognosis
Somatosensory evoked potential
Abnormality
Evoked potential
Coma (optics)
Clinical Significance
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Somatosensory evoked potentials (SEPs) reflect the activity of somatosensory pathways mediated through the dorsal columns of the spinal cord and the specific somatosensory cortex. In this study we aimed to demonstrate the effects of physiologic parameters such as height, age and gender on N9, N13, N20 SEP components and the central conduction time (CCT) to median nerve stimulation in Turkish population. The results revealed a statistically significant correlation between height, gender and SEP latencies (p < 0.05 and p < 0.0005 respectively) whereas no significant age related changes was found in SEPs. In all groups CCT was not influenced by these parameters.
Somatosensory evoked potential
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To evaluate the value of intraoperative neurophysiological monitoring (IONM) using brainstem auditory evoked potential (BAEP) and somatosensory evoked potential (SSEP) monitoring to predict and/or prevent postoperative neurological deficits during endoscopic endonasal surgery (EES).We retrospectively identified 138 consecutive patients who had BAEP monitoring in addition to SSEP monitoring during EES at our institution. We reviewed the postoperative clinical outcomes and neurophysiological changes independently.The total of number of patients with any IONM changes was 10. The incidence of BAEP changes was 3.62%. The incidence of SSEP changes was 3.62% as well. One patient had changes in both BAEPs and SSEPs. Majority of the changes were observed during changes in mean arterial pressure (MAP) without any postoperative neurological deficits. There were two postoperative neurological deficits.BAEPs and SSEPs provide unique information about integrity of brainstem function during EES procedures involving tumors in the and around clival region. We advocate a comprehensive multimodality approach to IONM during EESs including BAEPs and SSEPs depending on the location of the neural structures at risk.
Somatosensory evoked potential
Intraoperative neurophysiological monitoring
Evoked potential
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Objective To evaluate whether stent could improve the recovery of subclinical symptom of patients with vertebrobasilar transient ischemia attack.Methods A series of 11 patients who underwent stenting for vertebrobasilar transient ischemia attack patients with symptomatic vertebrobasilar artery stenosis was investigated in this study.All patients were evaluated with somatosensory evoked potential,brainstem auditory evoked potential,as well as visual evoked potential both before and after stent placement.Latency and wave amplitude of evoked potentials before and after stent placement were analysed for significance.Results We found abnormal evoked potential before the stenting,especially prolonged latency of N20 and P40 in somatosensory evoked potential(SEP),of wave I,Ⅲ and V in brainstem auditory evoked potential(BAEP),and of P100 in visual evoked potential(VEP).While after the procedure evoked potential showed that in BAEP the latency of I-Ⅲ wave significantly decreased(P=0.046) and the amplitude of wave Ⅲ increased significantly(P=0.05);In SEP the latency of N20 was shortened(P=0.012) and the intervals of N13-N20(P=0.013) and P14-N20(P=0.005) were both decreased;In VEP the latency of P100 was shortened significantly(P=0.022).Conclusion somatosensory evoked potential,brainstem auditory evoked potential,and visual evoked potential of patients with vertebrobasilar transient ischemia attack were improved after stenting.Stenting is may be helpful to the recovery of subclinical symptom.
Somatosensory evoked potential
Evoked potential
Vertebrobasilar insufficiency
Subclinical infection
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Introduction Intraoperative neurophysiological monitoring (IONM) is a method which uses different kinds of electrophysiological methods to monitor the function of neural structures during the operation. The methods are motor evoked potentials (MEP), somatosensory evoked potentials (SSEP), brainstem auditory evoked potentials (BAEP), visual evoked potentials (VEP), electroencephalography (EEG), and electromyography (EMG). There are a large number of indications for using IONM in neurosurgery, as well as in other fields of surgery.
Somatosensory evoked potential
Intraoperative neurophysiological monitoring
Neurophysiology
Evoked potential
Visual evoked potentials
Clinical neurophysiology
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Somatosensory evoked potential
Evoked potential
Intraoperative neurophysiological monitoring
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Objective To investigate the relationship of brainstem auditory evoked potential (BAEPs)and somatosensory evoked potentials(SEPs)with therapeutic outcome of severe brain injury.Methods BAEP and SEP monitoring were soon used after severe head injury of 33 patients. Results BAEPs and SEPs were superior in sensitivity,specificity and accuracy.Less abnormalities of BAEP and SEP can predict better prognosis.Conclusion BAEP and SEP can predict accurately the outcome of severe brain injury.
Somatosensory evoked potential
Evoked potential
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