Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

AAEM case report #22: polymyositis.

L R Robinson1

  • 1Department of Rehabilitation Medicine, University of Washington School of Medicine, Seattle.

Muscle & Nerve
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Using a novel psychosocial group intervention to improve adaption, coping and mental health outcomes following dysvascular limb amputations: A feasibility study.

Canadian prosthetics & orthotics journal·2025
Same author

Reduction in the appearance of facial hyperpigmentation after use of moisturizers with a combination of topical niacinamide and N-acetyl glucosamine: results of a randomized, double-blind, vehicle-controlled trial.

The British journal of dermatology·2009
Same author

Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin.

International journal of cosmetic science·2008
Same author

Back pain as a secondary disability in persons with lower limb amputations.

Archives of physical medicine and rehabilitation·2001
Same author

Optimizing the number of tests for carpal tunnel syndrome.

Muscle & nerve·2000
Same author

Increased threshold sural amplitude after upper limb isometric contraction in complete paraplegics.

American journal of physical medicine & rehabilitation·2000
Same journal

Characterizing Combined Central and Peripheral Demyelination-Insights From a Multimodal Comparison With Chronic Inflammatory Demyelinating Polyneuropathy and Multiple Sclerosis.

Muscle & nerve·2026
Same journal

Electrical Modalities in the Rehabilitation of Peripheral Nerve Injuries: State of the Literature and Current Clinical Applications.

Muscle & nerve·2026
Same journal

Reply to "Sural/Radial Amplitude Ratio in Non-Length-Dependent Neuropathy (NLDN): A Call for More Standardized Methodology and Further Evaluation of Distal NLDN".

Muscle & nerve·2026
Same journal

Late-Onset Myasthenia Gravis: An Increasingly Frequent Clinical Entity With Distinctive Challenges.

Muscle & nerve·2026
Same journal

Clinical Characteristics and Treatment Management of Seronegative Myasthenia Gravis: A Systematic Review of the Literature.

Muscle & nerve·2026
Same journal

Muscle-Specific Kinase Signaling and Its Therapeutic Potential.

Muscle & nerve·2026
See all related articles

Polymyositis causes progressive muscle weakness and shows specific electromyographic (EMG) abnormalities. Muscle biopsy is essential for diagnosis as other muscle diseases share similar EMG findings.

Area of Science:

  • Neurology
  • Immunology
  • Pathology

Background:

  • Polymyositis is an idiopathic inflammatory myopathy characterized by progressive proximal muscle weakness.
  • Diagnosis typically involves elevated muscle enzymes, inflammatory myositis on biopsy, and electromyographic findings.

Observation:

  • Electromyography (EMG) frequently reveals abnormalities in motor unit action potential (MUAP) configuration, duration, and amplitude.
  • Fibrillation potentials on EMG often indicate active disease and may decrease with effective treatment.

Findings:

  • The hallmark EMG abnormality in polymyositis involves alterations in MUAP characteristics.
  • Fibrillation potentials are common indicators of active inflammation in polymyositis.

Implications:

Related Experiment Videos

  • EMG findings are crucial for diagnosing polymyositis but require correlation with other clinical data.
  • Distinguishing polymyositis from other myopathies with similar EMG patterns necessitates a comprehensive diagnostic approach including muscle biopsy.