Visual evoked potential monitoring of optic nerve function during surgery.

Harding, G. F. A.; Bland, Jeremy D.P.; Smith, Vernon H.

doi:10.1136/jnnp.53.10.890

Cited by 52 publications

(24 citation statements)

References 11 publications

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“…For cranial surgery such as for removal of tumors and other lesions of the anterior pathways, Harding et al observed that "transient abolition of the VEP seen under many circumstances did not correlate with the outcome of surgery, but absence of a previously normal VEP for greater than 4 min during surgical manipulation within the orbit correlated with postoperative vision impairment." [ 46,54 ] However, few if any seem to have adopted this warning criteria and perhaps for good reason. It is been reported that complete absence of F-VEPs is consistent with normal visual recovery, and, conversely, preservation of the responses does not exclude the possibility of impaired vision post surgery [ 3,21 ] .…”

Section: Considerations Regarding Type Of Light Stimulationmentioning

confidence: 94%

Vep

Toleikis¹,

Toleikis²

2011

Monitoring the Nervous System for Anesthesiologists and Other Health Care Professionals

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Section: Considerations Regarding Type Of Light Stimulationmentioning

confidence: 94%

Vep

Toleikis¹,

Toleikis²

2011

Monitoring the Nervous System for Anesthesiologists and Other Health Care Professionals

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“…While some authors only see very limited use of VEP-monitoring under surgery at all [4][5][6][7][8], others have published optimistic results [9][10][11][12][13]. There is agreement on the need of further improvement regarding stimulation characteristics, recording technique, and anesthesiological management.…”

Section: Introductionmentioning

confidence: 94%

Fourier transformed steady-state flash evoked potentials for continuous monitoring of visual pathway function

et al. 2007

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Monitoring of somatosensory, motor and auditory pathway function by evoked potentials is routine in surgery placing these pathways at risk. However, visual pathway function remains yet inaccessible to a reliable monitoring. For this study, a method of continuous recordings was developed and tested. Steady-state visual evoked potentials were elicited by flash stimulation at 16 Hz and analysed using discrete Fourier transform. Amplitude and phase of the fundamental response were dynamically averaged and continuously plotted in a trend graph. The method was applied on awake individuals with normal vision and on patients undergoing neurosurgery. In most individuals it was possible to continuously record significant responses. Surprisingly, characteristic time-courses of amplitude and phase were observed in several subjects. These findings were attributed mainly to flicker-adaptation. During anesthesia, amplitude and signal-to-noise ratio were markedly smaller. Signal recognition was facilitated when potentials were recorded with a subdural electrode placed directly at the occipital pole. The anesthetic agent propofol had a major impact on the recordings.

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“…The VEP monitoring has been especially used in the neurosurgical operation to recover damaged visual function [1]. For example, it is applied to remove pituitary adenomas, which are brain tumors and occur in the pituitary gland.…”

Section: Introductionmentioning

confidence: 99%

Non-metallic VEP stimulator without interference in CT scanning for neurosurgical operation

Fukuma

Kawakami

Kitai

et al. 2006

2006 IEEE Biomedical Circuits and Systems Conference

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Non-metallic flash-type stimulators for monitoring visual evoked potential, named as the Fiber-Eyes, are proposed. Conventional VEP stimulators are comprised of LEDs and the print circuits, i.e. metallic materials, inside the stimulator. Proposed Fiber-Eyes are made from plastic optical fibers, silicone rubber, and external light source. Thus the Fiber-Eyes can be used together with CT scanning without interference in the image due to not use of the metallic parts during neurosurgical operations. They do not also radiate heat because the flash light for stimulus is supplied through the fibers, and thus it can avoid desiccation of the bulbar conjunctiva of patient in the operation.I.

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Visual evoked potential monitoring of optic nerve function during surgery.

Cited by 52 publications

References 11 publications

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Fourier transformed steady-state flash evoked potentials for continuous monitoring of visual pathway function

Non-metallic VEP stimulator without interference in CT scanning for neurosurgical operation

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