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Related Concept Videos

Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

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.
The binding of dantrolene to the RYR1...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...
Direct-Acting Cholinergic Agonists: Pharmacological Actions00:59

Direct-Acting Cholinergic Agonists: Pharmacological Actions

Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...
Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...

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Related Experiment Video

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Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
10:05

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia

Published on: January 27, 2018

Nonprimary dystonias.

Dirk Dressler1

  • 1Movement Disorders Section, Department of Neurology, Hanover Medical School, Hanover, Germany. dressler.dirk@mh-hanover.de

Handbook of Clinical Neurology
|April 19, 2011
PubMed
Summary
This summary is machine-generated.

Dystonias are classified into primary, secondary, dystonia-plus, and heredodegenerative types, with primary dystonias being most common. Effective treatments include botulinum toxin for focal dystonia and deep brain stimulation for generalized forms.

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Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia
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Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
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Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia
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09:51

Rapid Genotyping of Animals Followed by Establishing Primary Cultures of Brain Neurons

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Area of Science:

  • Neurology
  • Movement Disorders
  • Genetics

Background:

  • Dystonias are complex movement disorders with varied classifications, including primary, secondary, dystonia-plus syndromes, and heredodegenerative dystonias.
  • Primary dystonias constitute the majority (80-90%), with a significant genetic component in 20-30% of cases.
  • Secondary dystonias, often linked to cerebral palsy or drug-induced conditions, represent 10-20% and arise from exogenous factors affecting the brain.

Purpose of the Study:

  • To provide a comprehensive overview of dystonia classification, etiology, and management.
  • To highlight the diagnostic challenges and the importance of etiological clarification for non-primary dystonias.
  • To discuss current and historical treatment modalities for various dystonia subtypes.

Main Methods:

  • Literature review and clinical experience synthesis to classify dystonias.
  • Analysis of etiological factors contributing to primary and secondary dystonias.
  • Evaluation of treatment efficacy for different dystonia types, including pharmacological, surgical, and adjuvant therapies.

Main Results:

  • Primary dystonias are most prevalent, characterized by isolated dystonic movements.
  • Secondary dystonias result from brain damage or external agents; tardive dystonia and dystonia in cerebral palsy are common.
  • Dystonia-plus syndromes (e.g., dopa-responsive dystonia) and heredodegenerative dystonias present with additional neurological features.
  • Pseudodystonias mimic dystonia but stem from non-dystonic conditions.
  • Botulinum toxin injections are highly effective for focal/segmental dystonias; deep brain stimulation benefits generalized dystonia.
  • Limited efficacy and side effects are noted for many antidystonic drugs, with dopamine being crucial for dopa-responsive dystonia.

Conclusions:

  • Accurate classification and etiological diagnosis are crucial for managing dystonia, despite diagnostic complexities.
  • Current treatments focus on symptom management, with botulinum toxin and deep brain stimulation offering the most effective options for specific dystonia types.
  • Adjuvant therapies play a supportive role in improving quality of life for individuals with dystonia.