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Subsets of functional neurological disorders include functional neurologic symptom disorder (FNsD) (conversion disorder), functional movement disorder, and functional seizures. The diagnosis is made based on positive signs and symptoms in the history and examination during consultation of a neurologist. [3]
A movement disorder similar to PKD was first mentioned in research literature in 1940 by Mount and Reback. They described a disorder consisting of attacks of involuntary movements but unlike PKD, the attacks lasted minutes to hours and were found to be caused by alcohol or caffeine intake. [15] They named it paroxysmal dystonic choreoathetosis.
Treatment to control the chorea and dyskinesia in the early stages of DTDS is done with tetrabenazine and benzodiazepines. The dystonia is more difficult to control and the first-line agents include pramipexole and ropinirole ; adjuncts include trihexyphenidyl , baclofen , gabapentin , and clonidine for severe dystonia, and chloral hydrate and ...
As there appeared to be a connection with PED and mutated GLUT1 transporters a possible treatment was looking at changing patients diets. A common treatment for another disorder (GLUT1 Deficiency Syndrome) with a mutated GLUT1 transporter is the ketogenic diet. The diet is a strict 3:1 ratio of fat (3) to protein and carbohydrates (1).
The terminology for functional disorders has been fraught with confusion and controversy, with many different terms used to describe them. Sometimes functional disorders are equated or mistakenly confused with diagnoses like category of "somatoform disorders", "medically unexplained symptoms", "psychogenic symptoms" or "conversion disorders".
Movement disorders are clinical syndromes with either an excess of movement or a paucity of voluntary and involuntary movements, unrelated to weakness or spasticity. [1] Movement disorders present with extrapyramidal symptoms and are caused by basal ganglia disease . [ 2 ]
Ideational apraxia is a condition in which an individual is unable to plan movements related to interaction with objects, because they have lost the perception of the object's purpose. [2] Characteristics of this disorder include a disturbance in the concept of the sequential organization of voluntary actions.
Paroxysmal nonkinesigenic dyskinesia (PNKD) is an episodic movement disorder first described by Mount and Reback in 1940 under the name "Familial paroxysmal choreoathetosis". [2] It is a rare hereditary disease that affects various muscular and nervous systems in the body, passing to roughly fifty percent of the offspring.