When does Parkinson's disease begin?
Identifieur interne : 001F83 ( Main/Exploration ); précédent : 001F82; suivant : 001F84When does Parkinson's disease begin?
Auteurs : Carles Gaig [Espagne] ; Eduardo Tolosa [Espagne]Source :
- Movement Disorders [ 0885-3185 ] ; 2009.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- Anatomic pathology, Asymptomatic, Diagnostic Imaging, Disease Progression, Humans, Lewy Bodies (physiology), Motor system disorder, Movement (physiology), Nervous system diseases, Parkinson Disease (diagnosis), Parkinson Disease (pathology), Parkinson Disease (physiopathology), Parkinson disease, Parkinson's disease, Substantia Nigra (pathology), neuroimaging, non‐motor symptoms, pathology, premotor phase, subclinical period.
- MESH :
- diagnosis : Parkinson Disease.
- pathology : Parkinson Disease, Substantia Nigra.
- physiology : Lewy Bodies, Movement.
- physiopathology : Parkinson Disease.
- Diagnostic Imaging, Disease Progression, Humans.
Abstract
Pathological and neuroimaging studies have shown that in Parkinson's disease (PD) there is a “subclinical” or “premotor” period during which dopaminergic neurons in the substantia nigra (SN) degenerate but typical motor symptoms have not yet developed. Post‐mortem studies based on nigral cell counts and evaluating dopamine levels in the striata, and imaging studies assessing the nigrostriatal pathway in vivo, have estimated that this time period could last 3 to 6 years. In addition, emerging evidence indicates that the neuropathological process of PD does not start in the SN but more likely elsewhere in the nervous system: in the lower brainstem and the olfactory bulb, or even more distant from the SN, such as in the peripheral autonomic nervous system. Patients with PD frequently can present non‐motor symptoms, such as hyposmia or constipation, years before the development of classical motor signs. The physiopathology of these “premotor” symptoms, though still unclear, is currently thought to be related to early involvement by the pathological process underlying PD of non‐dopaminergic lower brainstem structures or autonomic plexuses. However, the answer to the question “when does PD start” remains uncertain. Here, we review clinical, pathological, and neuroimaging data related to the onset of the pathological process of PD, and propose that its onset is non‐motor and that non‐motor symptoms could begin in many instances 10 and 20 years before onset of motor symptoms. The variable course of the disorder once the motor symptoms develop, suggests that the start and progression of premotor PD is also highly variable andgiven the heterogeneous nature of PD, may differ depending on the cause/s of the syndrome. When and where the neuropathological process develops in PD remains uncertain. © 2009 Movement Disorder Society
Url:
DOI: 10.1002/mds.22672
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">Pathological and neuroimaging studies have shown that in Parkinson's disease (PD) there is a “subclinical” or “premotor” period during which dopaminergic neurons in the substantia nigra (SN) degenerate but typical motor symptoms have not yet developed. Post‐mortem studies based on nigral cell counts and evaluating dopamine levels in the striata, and imaging studies assessing the nigrostriatal pathway in vivo, have estimated that this time period could last 3 to 6 years. In addition, emerging evidence indicates that the neuropathological process of PD does not start in the SN but more likely elsewhere in the nervous system: in the lower brainstem and the olfactory bulb, or even more distant from the SN, such as in the peripheral autonomic nervous system. Patients with PD frequently can present non‐motor symptoms, such as hyposmia or constipation, years before the development of classical motor signs. The physiopathology of these “premotor” symptoms, though still unclear, is currently thought to be related to early involvement by the pathological process underlying PD of non‐dopaminergic lower brainstem structures or autonomic plexuses. However, the answer to the question “when does PD start” remains uncertain. Here, we review clinical, pathological, and neuroimaging data related to the onset of the pathological process of PD, and propose that its onset is non‐motor and that non‐motor symptoms could begin in many instances 10 and 20 years before onset of motor symptoms. The variable course of the disorder once the motor symptoms develop, suggests that the start and progression of premotor PD is also highly variable andgiven the heterogeneous nature of PD, may differ depending on the cause/s of the syndrome. When and where the neuropathological process develops in PD remains uncertain. © 2009 Movement Disorder Society</div>
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