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Related Concept Videos

Parkinson Disease l: Introduction01:24

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Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of...
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Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
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Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
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Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
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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...
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Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation
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Parkinson's disease.

John C Rothwell1, Mark J Edwards

  • 1Institute of Neurology, University College London, London, UK.

Handbook of Clinical Neurology
|October 12, 2013
PubMed
Summary
This summary is machine-generated.

Noninvasive brain stimulation research in Parkinson's disease reveals complex changes in brain excitability and inhibition. While early findings suggested reduced inhibition, newer studies indicate altered excitation and plasticity, particularly when patients are off therapy.

Keywords:
dyskinesiaintracortical inhibitionplasticitypremovement facilitationtranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Neurology
  • Biomedical Engineering

Background:

  • Parkinson's disease (PD) is a neurodegenerative disorder affecting motor control.
  • Noninvasive brain stimulation techniques have been widely researched to understand PD pathophysiology.
  • Previous studies focused on corticospinal excitability and GABAergic inhibition.

Purpose of the Study:

  • To review basic research on noninvasive brain stimulation in Parkinson's disease.
  • To analyze findings on brain excitability, inhibition, and plasticity in PD patients.
  • To explore the role of cortical plasticity in PD progression and compensation.

Main Methods:

  • Utilized transcranial magnetic stimulation (TMS) to measure corticospinal excitability.
  • Assessed intracortical inhibition using short-interval intracortical inhibition (SICI) and long-interval intracortical inhibition (LICI).
  • Examined silent period duration and synaptic plasticity in the motor cortex.

Main Results:

  • Conflicting reports exist regarding excitability, silent period, and LICI.
  • A consistent reduction in SICI is now interpreted as superimposed excitation.
  • Reduced motor cortex excitability off therapy is restored when on therapy, suggesting a role for plasticity.

Conclusions:

  • Noninvasive brain stimulation studies reveal evolving insights into PD neurophysiology.
  • Cortical plasticity may play a role in compensating for dopaminergic loss before clinical symptoms appear.
  • Further research is needed to fully elucidate the mechanisms underlying altered brain activity in PD.