Teaching Video NeuroImages: The underrecognized diphasic dyskinesia of Parkinson disease

Dyskinesia is a common motor complication in levodopa-treated Parkinson disease (PD), associated with higher doses, greater disease severity, and longer disease duration.1 Often assumed to be a peak-dose phenomenon, the diphasic (beginning-of-dose or end-of-dose) variant may be ignored, as exemplified by a patient with PD whose dyskinesia was initially interpreted as peak-dose (video at Neurology.org). Rapid improvement with apomorphine, a short-acting levodopa-equipotent dopamine agonist, confirmed its diphasic nature.2 Recognition of dyskinesia subtype based on the relationship with levodopa dose cycles (figure) facilitates their differing management in PD: while dopaminergic stimulation needs reduction in peak-dose dyskinesia, it should be increased in diphasic.
Source: Neurology - Category: Neurology Authors: Tags: Parkinson's disease/Parkinsonism, Chorea RESIDENT AND FELLOW SECTION Source Type: research

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ConclusionSubthalamic nucleus deep brain stimulation and levodopa independently lessened motor severity in PD to a similar magnitude, but their combined effect was greater than either treatment alone, suggesting therapeutic synergism.
Source: Journal of Neurology - Category: Neurology Source Type: research
We report a patient in whom levodopa-induced chorea-like dyskinesia disappeared when midazolam was given intravenously for conscious sedation.
Source: The British Journal of Oral and Maxillofacial Surgery - Category: ENT & OMF Authors: Tags: Case report Source Type: research
Researchers test a DBS device in development that automatically senses and adjusts delivery of electrical stimulation, aiming to avoid dyskinesia and other side effects of current technology.Medscape Medical News
Source: Medscape Neurology and Neurosurgery Headlines - Category: Neurology Tags: Neurology & Neurosurgery News Source Type: news
Condition:   Parkinson Disease Interventions:   Drug: IRL790;   Drug: Placebo Sponsor:   Integrative Research Laboratories AB Completed
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
Publication date: Available online 18 May 2018 Source:Neuroscience & Biobehavioral Reviews Author(s): Melissa M. Conti, Nicole Chambers, Christopher Bishop Traditionally, dopamine (DA) and acetylcholine (ACh) striatal systems were considered antagonistic and imbalances or aberrant signaling between these neurotransmitter systems could be detrimental to basal ganglia activity and pursuant motor function, such as in Parkinson’s disease (PD) and L-DOPA-induced dyskinesia (LID). Herein, we discuss the involvement of cholinergic interneurons (ChIs) in striatally-mediated movement in a healthy, parkinsonian, and dyski...
Source: Neuroscience and Biobehavioral Reviews - Category: Neuroscience Source Type: research
Insightec said this week it submitted an application for pre-market approval to the Japanese Pharmaceuticals and Medical Devices Agency seeking an indication for its Exablate Neuro to treat advanced Parkinson’s Disease in patients suffering from mobility, rigidity or dyskinesia. The Israel-based company’s Exablate Neuro device uses high-intensity, focused ultrasound to thermally ablate targeted tissue, guided by continuous magnetic resonance imaging; the procedure can be performed non-invasively through an intact skull. “Insightec is committed to supporting research that extends the applica...
Source: Mass Device - Category: Medical Devices Authors: Tags: Neurological Regulatory/Compliance Ultrasound INSIGHTEC Source Type: news
ConclusionsADS-5102 can be administered once-daily qhs to achieve high amantadine plasma concentrations in the morning and throughout the day, when symptoms of dyskinesia occur.
Source: Clinical Pharmacokinetics - Category: Drugs & Pharmacology Source Type: research
ela L Abstract Striatal cholinergic interneurons provide modulation to striatal circuits involved in voluntary motor control and goal-directed behaviors through their autonomous tonic discharge and their firing "pause" responses to novel and rewarding environmental events. Striatal cholinergic interneuron hyperactivity was linked to the motor deficits associated with Parkinson's disease and the adverse effects of chronic antiparkinsonian therapy like l-DOPA-induced dyskinesia. Here we addressed whether Kv7 channels, which provide negative feedback to excitation in other neuron types, are involved in the ...
Source: Neuropharmacology - Category: Drugs & Pharmacology Authors: Tags: Neuropharmacology Source Type: research
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