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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...
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...
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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
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Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:

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Related Experiment Video

Updated: May 26, 2026

MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
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Essential tremor: beyond the motor features.

Vijay Chandran1, Pramod Kumar Pal

  • 1Department of Neurology, Kasturba Medical College, Manipal 576104, India.

Parkinsonism & Related Disorders
|January 6, 2012
PubMed
Summary
This summary is machine-generated.

Essential Tremor (ET) is increasingly recognized as having significant non-motor symptoms beyond tremor. These include cognitive issues, anxiety, depression, sleep disturbances, and hearing impairment, indicating ET is not solely a motor disorder.

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Area of Science:

  • Neurology
  • Movement Disorders
  • Neuropsychiatry

Background:

  • Essential Tremor (ET) is primarily known for its motor symptom, tremor.
  • Emerging evidence suggests a broader spectrum of non-motor features in ET patients.
  • Understanding these non-motor aspects is crucial for comprehensive ET management.

Purpose of the Study:

  • To critically review and synthesize the evidence for non-motor symptoms in Essential Tremor.
  • To evaluate the impact and diagnostic utility of these non-motor features.
  • To reframe the understanding of ET beyond a purely motor disorder.

Main Methods:

  • Systematic review of existing literature on non-motor symptoms in Essential Tremor.
  • Analysis of reported cognitive, psychiatric, sleep, and sensory disturbances.
  • Assessment of the association with dementia and personality traits.

Main Results:

  • Patients with ET exhibit cognitive deficits (mild frontal dysfunction), increased prevalence of anxiety and depression, and poor sleep quality.
  • A link between late-onset ET and dementia (prevalent and incident) is observed.
  • Subjective hearing impairment is reported, while olfactory dysfunction remains controversial.

Conclusions:

  • Essential Tremor encompasses significant non-motor features, challenging its classification as a pure motor disorder.
  • Further research, including population-based studies, is needed to clarify the biological basis and confirm findings.
  • Comprehensive evaluation and treatment of ET should address both motor and non-motor symptoms.