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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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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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Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis
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Evolving concepts on bradykinesia.

Matteo Bologna1,2, Giulia Paparella2, Alfonso Fasano3,4,5,6

  • 1Department of Human Neurosciences, Sapienza University of Rome, Italy.

Brain : a Journal of Neurology
|December 14, 2019
PubMed
Summary
This summary is machine-generated.

Bradykinesia, a key Parkinson's symptom, involves slowness and reduced movement amplitude. Its underlying mechanisms are complex, involving basal ganglia network dysfunction, and current treatments offer variable improvement.

Keywords:
Parkinson’s diseasebradykinesiaclinical neurophysiologymotor controltranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Movement Disorders
  • Neurology

Background:

  • Bradykinesia is a primary motor symptom in Parkinson's disease (PD) and atypical parkinsonisms.
  • The precise clinical characteristics and pathophysiological underpinnings of bradykinesia remain incompletely understood.
  • Existing research presents a fragmented view of bradykinesia's multifaceted nature.

Purpose of the Study:

  • To comprehensively review clinical and experimental studies on bradykinesia.
  • To elucidate the pathophysiological mechanisms contributing to bradykinesia in PD and related disorders.
  • To synthesize current knowledge for future research and clinical applications.

Main Methods:

  • Systematic review of clinical studies in Parkinson's disease and atypical parkinsonism patients.
  • Review of experimental animal studies investigating parkinsonian state pathophysiology.
  • Analysis of data on bradykinesia features, Levodopa response, and neuroanatomical correlates.

Main Results:

  • Bradykinesia in PD includes slowness, reduced movement amplitude, and a sequence effect.
  • Atypical parkinsonisms share some features but less commonly exhibit the sequence effect.
  • Levodopa partially improves bradykinesia but has limited impact on the sequence effect.

Conclusions:

  • Bradykinesia arises from dysfunction within a network including the basal ganglia, motor cortex, and cerebellum.
  • Abnormal sensorimotor processing significantly contributes to bradykinetic symptoms.
  • Understanding bradykinesia's network pathophysiology is crucial for advancing clinical and experimental approaches.