Transient Electroretinographic Changes during Light-Induced Amaurosis in Severe Carotid Artery Stenosis Measured with a Novel Portable Handheld Device
Details
Serval ID
serval:BIB_6291CFE0C644
Type
Inproceedings: an article in a conference proceedings.
Publication sub-type
Abstract (Abstract): shot summary in a article that contain essentials elements presented during a scientific conference, lecture or from a poster.
Collection
Publications
Institution
Title
Transient Electroretinographic Changes during Light-Induced Amaurosis in Severe Carotid Artery Stenosis Measured with a Novel Portable Handheld Device
Title of the conference
Ophta 2018
Working group(s)
Wolfensberger, Thomas J., Borruat, François-Xavier, Abdulghafor, Mouna, Elalouf, Martine, Stappler, Theodor, Konstantinidis, Lazaros
Organization
111e congrès de la SSO
Address
Forum Fribourg
Rte du Lac 12
CH - 1763 Granges-Paccot
Rte du Lac 12
CH - 1763 Granges-Paccot
Publication state
Published
Issued date
31/08/2018
Language
english
Abstract
Purpose
Light-induced amaurosis is a symptom suggestive of reduced oxygenation of the RPE-outer retina resulting mostly from severe ipsilateral internal carotid artery stenosis or occlusion. We report the transient electroretinographic changes following light exposure in a patient with unilateral chronic ocular ischemic syndrome due to severe carotid artery stenosis using a novel portable hand-held electroretinography (ERG) device.
Methods
A 67 year old man complained of light-induced amaurosis. Ocular examination revealed extensive peripheral retinal ischemia and a severe ipsilateral internal carotid artery stenosis was found. Due to the extent of retinal ischemia, laser photocoagulation was planned. Photopic ERG (RETeval, LKC Technologies, Gaithersburg, MD) was recorded before and after 3-minute laser photocoagulation, as well as 15 minutes after photocoagulation. The interocular variation of amplitudes and implicit times of the flicker photopic b wave was examined.
Electroretinographic changes were measured using a novel handheld ERG diagnostic instrument that makes it possible to record ERGs rapidly and less invasively than the conventional ERG, using adhesive skin electrodes.
Results
Before light exposure, visual acuity was 0.6 in the right and 0.4 in the left eye, and there was an interocular asymmetry in the photopic ERG. Following 3 minute of light exposure (photocoagulation), left eye vision was absent (absolute scotoma) and left photopic ERG was significantly reduced. Vision slowly recovered in the left eye over 15 minutes, at which time both vision and photopic ERG had recovered to pre-illumination values. Otherwise, slit lamp examination, intraocular pressure and fundus examination showed no changes following light exposure.
Conclusion
Conventional full-field ERG may be cumbersome, due to the equipment size and the use of either contact lens or corneal wire electrodes. The availability of a handheld portable stimulator and the use of adhesive skin electrodes allow the clinician to perform rapid ERG assessment, when conventional ERG would be difficult to perform.
Our case demonstrated for the first time that the light-induced transient visual loss in a patient with a chronic ocular ischemic syndrome was correlated to a transient reduction of ERG activity.
Light-induced amaurosis is a symptom suggestive of reduced oxygenation of the RPE-outer retina resulting mostly from severe ipsilateral internal carotid artery stenosis or occlusion. We report the transient electroretinographic changes following light exposure in a patient with unilateral chronic ocular ischemic syndrome due to severe carotid artery stenosis using a novel portable hand-held electroretinography (ERG) device.
Methods
A 67 year old man complained of light-induced amaurosis. Ocular examination revealed extensive peripheral retinal ischemia and a severe ipsilateral internal carotid artery stenosis was found. Due to the extent of retinal ischemia, laser photocoagulation was planned. Photopic ERG (RETeval, LKC Technologies, Gaithersburg, MD) was recorded before and after 3-minute laser photocoagulation, as well as 15 minutes after photocoagulation. The interocular variation of amplitudes and implicit times of the flicker photopic b wave was examined.
Electroretinographic changes were measured using a novel handheld ERG diagnostic instrument that makes it possible to record ERGs rapidly and less invasively than the conventional ERG, using adhesive skin electrodes.
Results
Before light exposure, visual acuity was 0.6 in the right and 0.4 in the left eye, and there was an interocular asymmetry in the photopic ERG. Following 3 minute of light exposure (photocoagulation), left eye vision was absent (absolute scotoma) and left photopic ERG was significantly reduced. Vision slowly recovered in the left eye over 15 minutes, at which time both vision and photopic ERG had recovered to pre-illumination values. Otherwise, slit lamp examination, intraocular pressure and fundus examination showed no changes following light exposure.
Conclusion
Conventional full-field ERG may be cumbersome, due to the equipment size and the use of either contact lens or corneal wire electrodes. The availability of a handheld portable stimulator and the use of adhesive skin electrodes allow the clinician to perform rapid ERG assessment, when conventional ERG would be difficult to perform.
Our case demonstrated for the first time that the light-induced transient visual loss in a patient with a chronic ocular ischemic syndrome was correlated to a transient reduction of ERG activity.
Keywords
Retina vitreous
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Create date
02/09/2019 11:05
Last modification date
04/09/2019 5:10
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