A neurophysiologically-based mathematical model of flash visual evoked potentials

1993 ◽  
Vol 68 (3) ◽  
pp. 275-283 ◽  
Author(s):  
Ben H. Jansen ◽  
George Zouridakis ◽  
Michael E. Brandt
Keyword(s):  
Mathematical Model ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Flash Visual Evoked Potentials ◽  
Visual Evoked

scholarly journals Topographic Analysis of Flash Visual Evoked Potentials in Dogs

2005 ◽  
Vol 67 (9) ◽  
pp. 869-875 ◽  
Author(s):  
Tomofumi KIMOTSUKI ◽  
Mitsuya YASUDA ◽  
Satoshi TAMAHARA ◽  
Naoaki MATSUKI ◽  
Kenichiro ONO
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Topographic Analysis ◽  
Flash Visual Evoked Potentials ◽  
Visual Evoked

Flash visual evoked potentials in conscious horses: a preliminary study

2021 ◽  
pp. 103783
Author(s):  
Mariana Isa Poci Palumbo ◽  
Luiz Antonio de Lima Resende ◽  
Giovane Olivo ◽  
José Paes de Oliveira-Filho ◽  
Alexandre Secorun Borges
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Flash Visual Evoked Potentials ◽  
Preliminary Study ◽  
Visual Evoked

scholarly journals Anxiety affects the amplitudes of red and green color-elicited flash visual evoked potentials in humans

2000 ◽  
Vol 40 (1.2) ◽  
pp. 79-83
Author(s):  
Yuki Hosono ◽  
Kazuyoshi Kitaoka ◽  
Ryo Urushihara ◽  
Hiroyoshi Séi ◽  
Yohsuke Kinouchi
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Green Color ◽  
Flash Visual Evoked Potentials ◽  
Evoked Potentials In Humans ◽  
Visual Evoked

P10.1 Paired-pulse flash-visual evoked potentials: new methods revive an old test

2011 ◽  
Vol 122 ◽  
pp. S104
Author(s):  
R. Cantello ◽  
G. Strigaro ◽  
P. Prandi ◽  
M. Mula ◽  
C. Varrasi ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Paired Pulse ◽  
New Methods ◽  
Flash Visual Evoked Potentials ◽  
Visual Evoked

Flash visual evoked potentials and electroretinograms in migraine

2001 ◽  
Vol 25 (3) ◽  
pp. 143-150 ◽  
Author(s):  
Yasar Ozkul ◽  
Bulent Gurler ◽  
Senay Bozlar ◽  
Ayla Uckardes ◽  
Sezin Karadede
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Flash Visual Evoked Potentials ◽  
Visual Evoked

157 Reinventing the Wheel: Intraoperative Continuous Flash Visual Evoked Potentials, a Novel Technique to Lessen Intraoperative Optic Nerves and Chiasmal Injury in Endoscopic Skull Base Surgery

Neurosurgery ◽  
2017 ◽  
Vol 64 (CN_suppl_1) ◽  
pp. 239-239
Author(s):  
Fahad A Alkherayf ◽  
David Houlden ◽  
Chantal Turgeon ◽  
Charles B Agbi ◽  
Andre Lamothe ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Evoked Potentials ◽  
Skull Base ◽  
Visual Evoked Potentials ◽  
Skull Base Surgery ◽  
Optic Nerves ◽  
Novel Technique ◽  
Endoscopic Skull Base Surgery ◽  
Flash Visual Evoked Potentials ◽  
Visual Evoked

Abstract INTRODUCTION Optic nerve/chiasmal injury is a devastating outcome that may happen during endoscopic surgery. A key goal of endoscopic skull-base surgery is visual improvement. Currently, however, there is limited intraoperative visual pathway monitoring. We examine a novel technique that uses continuous flash visual evoked potentials (FVEPs). METHODS Eyes were stimulated by light stimulators (3 LEDs on each side, 640 nm peak wavelength, 10 ms pulse width, 3000 mCd of luminous intensity). Uniform illumination was placed over eyelids. Recording electrodes were placed at Oz-Fz. The filter cuts were = 5 Hz and 100 Hz with amplifier gain 20,000 or 50,000. EEG was recorded. Recordings were correlated to pre and post operative VFs and acuity. Dropping in the FVEP was examined in relation to intraoperative events. A drop of 50% from the base line was considered positive. RESULTS >101 patients had FVEPs in addition to other neurophysiologic monitoring. Patients demographic data, co-morbidities, diagnosis, surgical approach, length of surgery, MAP, and blood loss during surgery were recorded. All patients' visual acuity and field deficits were evaluated by neuro-ophthalmologist before their surgery and within 30 days after surgery. In our cohort, one patient had true positive pre-chiasmatic while another patient had false negative test result. However, the latter patient's deficit was post chiasmatic with no optic nerve or chiasmal injury. Another patient had false positive test (drop of 60%). Eight patients had transient changes related to traction of the chiasm or optic nerves. For predicting optic nerve or chiasmal injury, our study showed sensitivity of 100% (CI2.5-100), specificity of 99% (CI94.5-99.97) and negative predicted value of 100%. CONCLUSION FVEP is reproducible throughout surgery and can predict the post surgical outcome. Additionally, we found that FVEP is transiently affected by different stages of surgery. Further validation is required given the small number of optic/chiasmal injuries in our study.

scholarly journals Visual evoked potentials show strong positive association with intracranial pressure in patients with cryptococcal meningitis

2015 ◽  
Vol 73 (4) ◽  
pp. 309-313 ◽  
Author(s):  
Marcelo Adriano da Cunha Silva Vieira ◽  
Maria do Amparo Salmito Cavalcanti ◽  
Dorcas Lamounier Costa ◽  
Kelsen Dantas Eulálio ◽  
Otoni Cardoso do Vale ◽  
...  
Keyword(s):  
Intracranial Pressure ◽  
Evoked Potentials ◽  
Lumbar Puncture ◽  
Visual Evoked Potentials ◽  
Cryptococcal Meningitis ◽  
Positive Association ◽  
Strong Positive Correlation ◽  
Flash Visual Evoked Potentials ◽  
Strong Positive Association ◽  
Visual Evoked

Objective : To verify the relationship between intracranial pressure and flash visual evoked potentials (F-VEP) in patients with cryptococcal meningitis. Method The sample included adults diagnosed with cryptococcal meningitis admitted at a reference hospital for infectious diseases. The patients were subjected to F-VEP tests shortly before lumbar puncture. The Pearson’s linear correlation coefficient was calculated and the linear regression analysis was performed. Results : Eighteen individuals were subjected to a total of 69 lumbar punctures preceded by F-VEP tests. At the first lumbar puncture performed in each patient, N2 latency exhibited a strong positive correlation with intracranial pressure (r = 0.83; CI = 0.60 - 0.94; p < 0.0001). The direction of this relationship was maintained in subsequent punctures. Conclusion : The intracranial pressure measured by spinal tap manometry showed strong positive association with the N2 latency F-VEP in patients with cryptococcal meningitis.

The influence of age on the flash visual evoked potentials

2009 ◽  
Vol 73 (4) ◽  
pp. 308-312 ◽  
Author(s):  
Maria Teresa Contestabile ◽  
Francesco Suppressa ◽  
Giuseppe Tonelli ◽  
Dario Giorgi ◽  
Guglielmo Antonnicola ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Flash Visual Evoked Potentials ◽  
Visual Evoked
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