Enhanced ptosis in Myasthenia Gravis

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Identifier Enhanced ptosis in MG
Title Enhanced ptosis in Myasthenia Gravis
Subject Myasthenia Gravis
Creator Daniel R. Gold, DO, Departments of Neurology, Ophthalmology, Neurosurgery, Otolaryngology - Head & Neck Surgery, The Johns Hopkins School of Medicine
Description This is a 20-yo-woman who presented with generalized weakness, ptosis and ophthalmoplegia. She had severe ptosis OU at baseline, but when one eyelid was manually elevated, there was marked enhanced ptosis of the opposite eyelid. This was in accordance with Hering's law of equal innervation of the levator muscles - i.e., manual elevation of a ptotic eyelid decreases the muscle strength necessary to keep the lid elevated, causing contralateral levator relaxation and enhanced ptosis. In MG-related unilateral ptosis, lifting the normal-appearing eyelid commonly leads to ‘enhanced ptosis of the already ptotic eyelid. Alternatively, lifting the ptotic eyelid may cause the normal-appearing eyelid to become ptotic, which is referred to as ‘curtaining'. The baseline equal innervation of the levator muscles due to Hering's law explains both enhanced ptosis and curtaining in MG.
Publisher Spencer S. Eccles Health Sciences Library, University of Utah
Date 2016
Type Image/MovingImage
Format video/mp4
Rights Management Copyright 2016. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright
Collection Neuro-ophthalmology Virtual Education Library: NOVEL http://NOVEL.utah.edu
Language eng
ARK ark:/87278/s6mw5rsc
Setname ehsl_novel_gold
Date Created 2016-10-27
Date Modified 2018-07-30
ID 187759
Reference URL https://collections.lib.utah.edu/ark:/87278/s6mw5rsc
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