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Related Concept Videos

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...
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'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 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...
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...
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 25, 2026

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation
11:12

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation

Published on: July 16, 2014

Subthreshold depression in Parkinson's disease.

Daniel A Nation1, Heather L Katzen, Spyridon Papapetropoulos

  • 1Department of Psychology, University of Miami, Coral Gables, FL, USA.

International Journal of Geriatric Psychiatry
|February 13, 2009
PubMed
Summary
This summary is machine-generated.

Subthreshold depression (sD) affects nearly 30% of Parkinson's disease (PD) patients, often presenting with symptoms overlapping those of PD itself. This condition is more common in younger individuals with PD.

Related Experiment Videos

Last Updated: Jun 25, 2026

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation
11:12

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation

Published on: July 16, 2014

Area of Science:

  • Neurology
  • Psychiatry
  • Clinical Psychology

Background:

  • Parkinson's disease (PD) is frequently associated with depression, with an estimated 40% of patients experiencing clinical depression.
  • However, the prevalence and characteristics of subthreshold depression (sD) in PD remain understudied.
  • Understanding sD is crucial for comprehensive patient care in PD.

Purpose of the Study:

  • To determine the prevalence of subthreshold depression (sD) in nondemented patients with moderate to severe Parkinson's disease (PD).
  • To characterize the associated clinical and demographic features of sD in this population.
  • To describe the symptom profile of patients with sD.

Main Methods:

  • Classified 111 nondemented PD patients into diagnostic depression (DD), subthreshold depression (sD), or nondepressed (ND) groups.
  • Utilized Diagnostic and Statistical Manual, 4th edn criteria for DD and established criteria for sD, applied to Beck Depression Inventory, 2nd edn data.
  • Compared groups on clinical/demographic variables and analyzed the symptom profile of the sD group.

Main Results:

  • Identified 26.1% of patients with DD, 28.8% with sD, and 45.0% as ND.
  • Patients with sD were younger (approx. 5 years) than the ND group, with no significant differences in disease stage or other demographics.
  • The sD group frequently reported symptoms overlapping with PD, such as fatigue, sleep difficulties, appetite changes, and concentration issues.

Conclusions:

  • Subthreshold depression (sD) is a common condition in Parkinson's disease (PD), affecting over a quarter of patients.
  • sD appears more prevalent in younger individuals with PD.
  • The overlap in symptoms between sD and PD highlights the challenge in differentiating these conditions and underscores the need for careful clinical assessment.