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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...
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Functional imaging in pre-motor Parkinson's disease.

D Arnaldi1, S Morbelli, A Picco

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The Quarterly Journal of Nuclear Medicine and Molecular Imaging : Official Publication of the Italian Association of Nuclear Medicine (AIMN) [And] the International Association of Radiopharmacology (IAR), [And] Section of the Society Of
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REM sleep behavior disorder (RBD) is a key indicator for identifying pre-motor Parkinson's disease (PD). Early detection through screening for RBD and other symptoms, alongside advanced imaging, aids in understanding neurodegeneration.

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Non-motor symptoms (NMS) can precede Parkinson's disease (PD) motor symptoms.
  • Identifying pre-motor PD is challenging, with REM sleep behavior disorder (RBD) being a significant indicator.
  • RBD can precede PD by years but also occurs in other synucleinopathies.

Purpose of the Study:

  • To evaluate REM sleep behavior disorder (RBD) as a screening tool for pre-motor Parkinson's disease (PD).
  • To explore the role of functional imaging in understanding neurodegeneration in pre-motor PD and idiopathic RBD (iRBD).
  • To highlight the need for effective biomarkers for early PD diagnosis and management.

Main Methods:

  • Review of clinical features and diagnostic challenges in pre-motor Parkinson's disease.
  • Analysis of the association between REM sleep behavior disorder (RBD) and Parkinson's disease (PD).
  • Discussion of functional imaging techniques, including radionuclide methods and novel tracers for alpha-synuclein.

Main Results:

  • REM sleep behavior disorder (RBD) is considered the most promising clinical feature for identifying pre-motor PD patients.
  • Other potential pre-motor indicators include hyposmia, depression, and autonomic dysfunction.
  • Functional imaging studies have investigated dopaminergic and non-dopaminergic pathways in RBD and PD.

Conclusions:

  • REM sleep behavior disorder (RBD) is a high-risk indicator for developing Parkinson's disease (PD).
  • Functional imaging, especially with new tracers, holds potential for understanding PD's neurodegenerative process.
  • Improved biomarkers and imaging are crucial for early PD diagnosis, monitoring, and intervention.