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Myasthenia Gravis: Diagnostic Tests

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The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...

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Related Experiment Video

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Published on: December 18, 2016

Quantitative electromyography in dengue-associated muscle dysfunction.

Jayantee Kalita1, Usha K Misra, Pradeep K Maurya

  • 1Department of Neurology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|October 3, 2012
PubMed
Summary
This summary is machine-generated.

Quantitative electromyography (QEMG) in dengue myopathy patients showed improved motor unit potential duration after one month. This finding correlated with clinical recovery and reduced creatine kinase levels, indicating muscle healing.

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Area of Science:

  • Neurology
  • Infectious Diseases
  • Musculoskeletal System

Background:

  • Dengue virus infection can cause significant muscle involvement, termed dengue myopathy.
  • Understanding the electrophysiological changes in dengue myopathy is crucial for diagnosis and management.

Purpose of the Study:

  • To document muscle involvement in dengue virus infection using quantitative electromyography (QEMG).
  • To assess changes in muscle electrophysiology over time in dengue myopathy patients.

Main Methods:

  • Clinical examination of muscle power, tone, and reflexes.
  • Biochemical tests including serum creatine kinase (CK) levels.
  • Quantitative electromyography (QEMG) of biceps muscle.
  • Muscle biopsy in two patients.
  • Repeat clinical and QEMG assessments after 1 month.

Main Results:

  • Thirteen patients with dengue myopathy were studied, exhibiting mild to severe muscle weakness, predominantly in proximal lower limbs.
  • Elevated serum CK levels were observed (median 480 U/L).
  • QEMG revealed significant improvement in motor unit potential (MUP) duration at 1 month compared to baseline.
  • Clinical and biochemical parameters improved in all patients after 1 month.
  • Muscle biopsy showed interstitial hemorrhage and myonecrosis without inflammation.

Conclusions:

  • QEMG demonstrated improvement in MUP duration in dengue myopathy patients at 1-month follow-up.
  • This electrophysiological improvement paralleled clinical recovery and normalization of CK levels.
  • QEMG is a valuable tool for monitoring muscle recovery in dengue myopathy.