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MuSK Antibody-Positive Myasthenia Gravis

Rare myasthenia subtype with predominant bulbar and respiratory muscle involvement.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Nöroloji department. Book Appointment →

What is MuSK Antibody-Positive Myasthenia Gravis?

MuSK (muscle-specific tyrosine kinase) antibody-positive myasthenia gravis is a subtype that accounts for a portion of AChR-negative patients and shows clinical features partially distinct from classic myasthenia gravis.

In these patients, the bulbar, neck, shoulder, and respiratory muscles are predominantly involved, while ocular findings may be less prominent.

MuSK antibodies belong to the IgG4 subclass and disrupt the clustering of acetylcholine receptors at the neuromuscular junction.

Symptoms

Marked dysphagia and dysarthria
Facial muscle weakness and atrophy
Early neck-flexor involvement
Frequent episodes of respiratory failure
Relatively mild ocular findings
Fatigue worsened by exertion
Tongue atrophy in some patients

Risk Factors

Female sex (clear majority)
Background of autoimmune disease
HLA-DR14, DR16 tissue types

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Marked nasal speech
  • Frequent recurrent episodes of respiratory failure
  • Dysphagia with risk of aspiration
  • Facial muscle weakness and atrophy
  • Inadequate response to pyridostigmine

Treatment Methods

01
Corticosteroids
02
Rituximab (an important treatment option)
03
Plasmapheresis
04
Mycophenolate mofetil
05
IVIG during myasthenic crises
06
Mechanical ventilation when intensive respiratory support is needed

Which Department to Visit?

You can visit our Nöroloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Let us help you

You can make an appointment with our specialists or contact us for your concerns.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.