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Related Concept Videos

Parkinson's Disease: Treatment01:24

Parkinson's Disease: Treatment

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.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

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 which...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

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 to...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

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...
REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
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...

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Related Experiment Video

Updated: Jun 17, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
07:26

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Published on: September 26, 2019

Sleepiness in Parkinson's disease.

Isabelle Arnulf1, Smaranda Leu-Semenescu

  • 1Sleep Disorders Unit and Inserm UMR 975, Pitié-Salpêtrière Hospital, Assistance Publique Hôpitaux de Paris, Paris 6 University, Paris, France. isabelle.arnulf@psl.aphp.fr

Parkinsonism & Related Disorders
|January 20, 2010
PubMed
Summary

Excessive daytime sleepiness affects Parkinson's disease (PD) patients due to damaged arousal systems. Treatments like modafinil show limited efficacy, suggesting new therapeutic targets for sleep disorders in PD.

Related Experiment Videos

Last Updated: Jun 17, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
07:26

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Published on: September 26, 2019

Area of Science:

  • Neurology
  • Sleep Medicine
  • Neuroscience

Background:

  • Excessive daytime sleepiness (EDS) is a significant issue for Parkinson's disease (PD) patients, impacting 33% and causing sleep attacks in 1-4%.
  • Sleep patterns in PD patients include narcolepsy-like naps with REM sleep or non-REM sleep intrusions.
  • While insomnia and other sleep disorders are common, their direct link to EDS severity is unclear.

Purpose of the Study:

  • To investigate the underlying mechanisms of excessive daytime sleepiness in Parkinson's disease.
  • To explore the role of specific neurotransmitter systems in PD-related sleep disturbances.
  • To evaluate the efficacy of current and potential treatments for sleepiness in PD.

Main Methods:

  • Review of existing literature on sleepiness in Parkinson's disease.
  • Analysis of patient data regarding sleep patterns, medication, and symptoms.
  • Examination of the neurobiological basis of arousal systems affected in PD.

Main Results:

  • Dopamine agonists increase the risk of sleep attacks compared to levodopa.
  • Sleepiness may precede parkinsonism onset, indicating disease-specific factors.
  • Damage to noradrenergic, cholinergic, serotonergic, and orexinergic arousal systems is implicated, while histaminergic and dopaminergic systems appear normal.

Conclusions:

  • Dysfunction in multiple arousal systems contributes to EDS in Parkinson's disease.
  • Current treatments like modafinil offer partial relief; novel therapies targeting specific pathways show promise.
  • Targeting the pedunculopontine nucleus offers variable effects, highlighting the complexity of arousal regulation in PD.