Transient Electroretinographic Changes during Light-Induced Amaurosis in Severe Carotid Artery Stenosis Measured with a Novel Portable Handheld Device
Détails
ID Serval
serval:BIB_6291CFE0C644
Type
Actes de conférence (partie): contribution originale à la littérature scientifique, publiée à l'occasion de conférences scientifiques, dans un ouvrage de compte-rendu (proceedings), ou dans l'édition spéciale d'un journal reconnu (conference proceedings).
Sous-type
Abstract (résumé de présentation): article court qui reprend les éléments essentiels présentés à l'occasion d'une conférence scientifique dans un poster ou lors d'une intervention orale.
Collection
Publications
Institution
Titre
Transient Electroretinographic Changes during Light-Induced Amaurosis in Severe Carotid Artery Stenosis Measured with a Novel Portable Handheld Device
Titre de la conférence
Ophta 2018
Collaborateur⸱rice⸱s
Wolfensberger, Thomas J., Borruat, François-Xavier, Abdulghafor, Mouna, Elalouf, Martine, Stappler, Theodor, Konstantinidis, Lazaros
Organisation
111e congrès de la SSO
Adresse
Forum Fribourg
Rte du Lac 12
CH - 1763 Granges-Paccot
Rte du Lac 12
CH - 1763 Granges-Paccot
Statut éditorial
Publié
Date de publication
31/08/2018
Langue
anglais
Résumé
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.
Mots-clé
Retina vitreous
Site de l'éditeur
Création de la notice
02/09/2019 11:05
Dernière modification de la notice
04/09/2019 5:10
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