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Related Concept Videos

Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
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Satellite Stem Cells and Muscular Dystrophy01:21

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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Myasthenia Gravis: Overview and Treatment01:20

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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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Structure of Cardiac Muscles01:13

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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
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Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Myotonic dystrophy type 1 - a multiorgan disorder.

Kristin Ørstavik1, Gro Solbakken2, Magnhild Rasmussen3

  • 1Seksjon for sjeldne nevromuskulære tilstander, Oslo universitetssykehus, og, Enhet for medfødte og arvelige nevromuskulære tilstander, Oslo universitetssykehus, Rikshospitalet.

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Summary
This summary is machine-generated.

Myotonic dystrophy type 1 (DM1) is a common inherited muscle disease. Early diagnosis and treatment are crucial as symptoms can affect multiple organs and worsen over generations.

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Area of Science:

  • Genetics and наследственные заболевания
  • Neuromuscular disorders

Background:

  • Myotonic dystrophy type 1 (DM1) is an autosomal dominant inherited disorder affecting all ages.
  • It is the most common inherited muscular disease in adults.
  • Limited medical awareness of non-muscular symptoms leads to delayed diagnosis.

Purpose of the Study:

  • To increase awareness of DM1 among medical professionals.
  • To highlight the importance of early diagnosis and comprehensive management.
  • To improve follow-up care for patients with DM1.

Main Methods:

  • This is a clinical review article.
  • It synthesizes current knowledge on DM1.
  • Focuses on clinical presentation, diagnosis, and management.

Main Results:

  • Delayed diagnosis of DM1 is common due to under-recognition of diverse symptoms.
  • The disorder can progress significantly and worsen across generations.
  • Inadequate treatment results from late or missed diagnoses.

Conclusions:

  • Increased awareness can lead to more rapid diagnosis of DM1.
  • Better follow-up care is essential for managing this multiorgan disorder.
  • Timely intervention improves patient outcomes for DM1.