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Parkinson Disease l: Introduction

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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 which...

Parkinson Disease ll: Pathophysiology

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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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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: Overview

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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 to...

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Updated: May 20, 2026

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation

Published on: July 16, 2014

Late-stage Parkinson disease.

Miguel Coelho¹, Joaquim J Ferreira

¹Department of Neuroscience, Hospital Santa Maria, Neurological Clinical Research Unit, Instituto de Medicina Molecular, Lisbon, Portugal.

Nature Reviews. Neurology

|July 11, 2012

Summary

Nonmotor symptoms (NMS) significantly impact Parkinson disease (PD) progression and disability, necessitating their inclusion in clinical models. A new definition for late-stage Parkinson disease is proposed to reflect this evolving understanding.

Area of Science:

Neurology
Neuroscience
Gerontology

Background:

Parkinson disease (PD) is characterized by motor symptoms like bradykinesia, rigidity, tremor, and postural instability.
Nonmotor symptoms (NMS), including dementia, psychosis, depression, and apathy, are increasingly recognized as major contributors to disability in PD.
NMS and axial symptoms in PD are often resistant to levodopa therapy.

Purpose of the Study:

To review the evolving understanding of later stages of Parkinson disease.
To propose a revised definition for late-stage PD that incorporates nonmotor symptoms and caregiver dependency.

Main Methods:

Literature review of Parkinson disease progression models.
Analysis of the impact of nonmotor symptoms and advanced treatments on disease staging.

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Induction and Assessment of Levodopa-induced Dyskinesias in a Rat Model of Parkinson's Disease

Induction and Assessment of Levodopa-induced Dyskinesias in a Rat Model of Parkinson's Disease

Published on: October 14, 2021

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Last Updated: May 20, 2026

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation

Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation

Published on: July 16, 2014

Induction and Assessment of Levodopa-induced Dyskinesias in a Rat Model of Parkinson's Disease

Induction and Assessment of Levodopa-induced Dyskinesias in a Rat Model of Parkinson's Disease

Published on: October 14, 2021

Conceptual framework development for late-stage PD definition.

Main Results:

The traditional model of PD progression, focused solely on motor signs and levodopa complications, is insufficient.
Deep brain stimulation has altered the definition of advanced PD, extending patient survival and altering disability profiles.
Patients increasingly progress to a phase of severe dependency, with disability dominated by levodopa-resistant motor and nonmotor symptoms.

Conclusions:

Clinical models of Parkinson disease progression must integrate nonmotor symptoms alongside motor signs.
A new definition of late-stage PD is needed to accurately describe patients who have surpassed the advanced stage, characterized by severe disability and dependency.
Recognizing and managing NMS is crucial for improving quality of life in later stages of Parkinson disease.