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Related Concept Videos

Myasthenia Gravis: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

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Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
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Myasthenia Gravis: Diagnostic Tests01:15

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Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
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Experimental Glaucoma Induced by Ocular Injection of Magnetic Microspheres
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Ocular Myasthenia.

Mohammed Al-Haidar1, Michael Benatar1, Henry J Kaminski1

  • 1Department of Neurology, George Washington University, 2150 Pennsylvania Avenue, Northwest, Washington, DC 20037, USA; Department of Neurology, 1150 Northwest 14th Street #715, Miami, FL 33136, USA.

Neurologic Clinics
|April 16, 2018
PubMed
Summary
This summary is machine-generated.

Ocular myasthenia gravis causes debilitating visual symptoms like ptosis and diplopia due to ocular muscle weakness. Diagnosing this condition can be challenging, often requiring specific clinical signs beyond standard antibody tests.

Keywords:
Acetylcholine receptorDouble visionExtraocular muscleMyasthenia gravisOcular myastheniaPrednisonePtosis

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Area of Science:

  • Ophthalmology
  • Neurology
  • Immunology

Background:

  • Ocular myasthenia gravis (OMG) is a subtype of myasthenia gravis characterized by weakness confined to eye muscles.
  • It can lead to significant visual impairment, manifesting as fluctuating ptosis (drooping eyelid) and diplopia (double vision).

Purpose of the Study:

  • To describe the clinical presentation and diagnostic challenges of ocular myasthenia gravis.
  • To highlight specific examination findings indicative of OMG.

Main Methods:

  • Clinical case review and analysis of patient presentations.
  • Description of characteristic physical examination findings in ocular myasthenia gravis.

Main Results:

  • Patients commonly present with fluctuating ptosis and/or diplopia.
  • Ocular motility deficits can range from isolated palsies to complete ophthalmoplegia.
  • Specific signs like Cogan lid twitch, enhanced ptosis, peek sign, and saccadic fatigue support the diagnosis.
  • Autoantibody serology and repetitive nerve stimulation studies may be negative, complicating diagnosis.

Conclusions:

  • Ocular myasthenia gravis presents with specific ocular motor symptoms and signs.
  • Diagnostic confirmation can be difficult due to limitations in serological and electrodiagnostic testing.
  • Clinical examination is crucial for suspecting and diagnosing ocular myasthenia gravis.