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Related Concept Videos

Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
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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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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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Disorders of the Skeletal Muscle01:28

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
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Chemical Synapses01:26

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Toxic Myopathies.

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    Continuum (Minneapolis, Minn.)
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    This summary is machine-generated.

    Toxic myopathy, often caused by medications like statins, typically resolves when the drug is stopped. However, some cases involve immune responses requiring specific treatment for muscle recovery.

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    Area of Science:

    • Neurology
    • Toxicology
    • Pharmacology

    Background:

    • Reviews the pathogenesis, clinical features, and management of toxic myopathy.
    • Covers myopathy linked to medications, critical illness, and illicit substances.

    Observation:

    • Muscle symptoms are frequent in statin users, usually reversible upon drug cessation.
    • Immune-mediated necrotizing myopathy from statins may persist, necessitating immunomodulatory therapy.
    • Immune checkpoint inhibitors are linked to inflammatory myositis; antivirals like zidovudine, telbivudine, and raltegravir can cause myopathy.

    Findings:

    • Commonly implicated drugs include statins, amiodarone, chloroquine, hydroxychloroquine, colchicine, certain antivirals, and corticosteroids.
    • Chronic alcoholism is also associated with myopathy.
    • Clinical, electrodiagnostic, and histologic features aid in early recognition.

    Implications:

    • Discontinuation of the offending agent resolves symptoms in most toxic myopathy cases.
    • Specific, timely treatment is crucial for immune-mediated muscle injury.
    • Understanding these associations is key for safe medication use and patient management.