paroxysmal dyskinesias kapil d sethi md faan frcp(uk) director movement disorders program mcg a unit...
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Paroxysmal Dyskinesias
Kapil D Sethi MD FAAN FRCP(UK)
Director Movement Disorders Program MCG a unit of GRU
Augusta Georgia
Senior Medical Expert Merz Pharmaceuticals
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HYPP in a Quarter Horse
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Paroxysmal Dyskinesias (PDys)
• A heterogeneous group of disorders characterized by the abrupt onset of abnormal involuntary movements.These usually arise out of a background of normal motor behavior
• The attacks are often not witnessed by the physician and the movements are varied with a combination of chorea, ballism and dystonia.
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Paroxysmal Dyskinesias
What is not considered to be a Paroxysmal Dyskinesia?
1. Action/Task Specific Dystonia
2. Tics- can occur in bursts
3. Paroxysmal Exaggeration of Tremor
4. Action Myoclonus
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Paroxysmal Dyskinesias
• There are four groups PKD,PNKD,PHD?,PED• These basic four groups can be idiopathic
(primary) or secondary to a known disorder • The idiopathic group may be familial or sporadic• These disorders can be further subdivided into
short (less than 5 minutes) or long (greater than 5 minutes)
• Many cases cannot be compartmentalized in any of the above categories
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Paroxysmal Kinesigenic Dyskinesia
• Term PK Choreoathetosis was coined by Kertesz (1967)
• In one review out of 111 patients,49 were familial• Usually inherited in an autosomal dominant mode
and rarely recessive.• Male to female 89/22 (4:1)• Age of onset 5-15 in familial cases and variable in
sporadic cases.
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PKD -AGE DISTRIBUTION
Bruno et al 2004
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Paroxysmal Kinesigenic Dyskinesia
• Attacks precipitated by sudden movement or startle and sometimes by stress
• Frequency up to 100 per day of short lasting (Patients may have a sensory aura before the attack and there is often a refractory period
• Most have asymmetric dystonia while others may have chorea
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PKD-Proposed Criteria
Bruno et al 2004
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Paroxysmal Nonkinesigenic Dyskinesia
• Mount and Reback(1940) described 28 members of a large family with Paroxysmal Dystonic Choreoathetosis
• Often inherited as an autosomal dominant trait
• More often in males (2:1)• As in PKD attacks start in childhood and
decrease in adulthood
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Paroxysmal Nonkinesigenic Dyskinesia
• Attacks precipitated by alcohol,fatigue,and caffeine. In one series 98% of cases with MFR-1 mutation had this clinical correlate.(Bruno,2007)
• Some families have predominant dystonia while others have chorea.
• Frequency 3/day to 2/year.• Duration minutes to hours rarely under 5 minutes.
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Paroxysmal Exercise-Induced Dyskinesia
• Lance described the intermediate attacks• Frequency 1 per day to two/month• The duration is intermediate between PKD
and PNKD (5-30 minutes)• Prolonged exercise precipitates attack• The legs are more affected but the exercise
limited to upper extremity may involve upper limbs alone
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Paroxysmal Exercise-Induced Dyskinesia
• Usually,inherited in a dominant mode but sporadic attacks described as well
• In some families there is an overlap between PNKD and PED.
• PED may precede parkinsonism in familial PD (Bruno MK, 2004)
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?Paroxysmal Hypnogenic Dyskinesia
• First description by Joynt and Green in a patient with multiple sclerosis.
• Attacks occur during Non-REM sleep. Attacks represent medial frontal lobe
seizures in most cases.• In rare cases the long lasting attacks may be
basal ganglia origin.
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Secondary Paroxysmal Dyskinesias
• Multiple sclerosis
• Cerebral Palsy
• Hypoparathyroidism and pseudohypoparathyroidism
• Hypoglycemia
• Head trauma
• Cerebrovascular disease
• Neuroacanthocytosis
• Psychogenic
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Miscellaneous Causes of Sec PDx
• Cytomegalovirus Encephalitis
• Neurosarcoidosis
• Migraine
• Cervical Cord lesions
• Primary CNS Lymphoma
• Kernicterus
• Hypoglycemia
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Secondary Paroxysmal Dyskinesia- Multiple Sclerosis
• Also known as tonic seizures and may be the presentation of the disease. Unilateral , bilateral attacks described more in the. Japanese. Hyperventilation precipitates the attack. Painful
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Metabolic Disorders
• PNKD may occur in Idiopathic hypoparathyroidism
• PNKD and PKD reported in pseudohypoparathyroidism (Dure,1998)
• The dyskinesia may respond to Vitamin D and Calcium
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Secondary Paroxysmal Dyskinesia - Vascular
• It is important to recognize that PD may occur as a manifestation of TIA’s
• These attacks may herald a major infarction
• A variant is orthostatic paroxysmal dystonia in severe large vessel disease
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Sandifer Syndrome
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Psychogenic paroxysmal Dyskinesias
• Very Common
• In one series 21/76 cases had Psychogenic PDx second in frequency only to the familial cases
• There may or may not be obvious psychopathology or secondary gain
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Paroxysmal Kinesigenic Dyskinesia-Pathophysiology
– Attributed to basal ganglia dysfunction
– Electrophysiology reveals ncreased excitability of cortex and spinal cord
– Surface EEG is normal in most cases– Lombroso(1996) reported invasive depth
electrodes recordings in a patient with PKD– Spikes were recorded in the SMA that spread to
the caudate nucleus
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PNKD- Pathophysiology
• An invasive study demonstrated that the PNKD did not originate from the cortex, while a discharge was registered from the caudate nuclei.
• An 18FDG PET scan failed to show metabolic anomalies.
• A 18FDOPA and a 11C raclopride PET scans revealed a marked reduction in presynaptic dopa decarboxylase activity in the striatum, together with an increased density of postsynaptic dopamine D2 receptors.
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Genetics of paroxysmal dyskinesia- a Journey
• Many cases of PKD have inter-ictal myoclonus• Szepetowski’s was the first to mention an association
between PKD and infantile convulsions(ICCA) syndrome. They documented the linkage to the pericentromeric region of chromosome 16
• Swoboda (Neurology 2000) et al confirmed the presence of infantile convulsions and the later onset of PKD in 11 families and reported linkage to the same area.
• Tomita reported the linkage of PKD to chromosome 16
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Paroxysmal Dyskinesias-Genetics
• PKD is genetically heterogenous-The abnormal gene is localized to chromosome 16. (EKD1). There are two other known loci (EKD 2 and 3) . The gene is unknown at present.
• A Chinese family described with linkage to chromosome 3 (Zhonghua Yi Xue ,2009)
RE-WC-PED maps to the same chromosome but not exactly at the same location.
• A newly described entity is X-linked PKD and MR due to a mutation in the MCT 8 gene .
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The RICH Area on Chromosome 16
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Proline Rich Transmembrane Protein 2(PRRT2) Location of 23 mutations in PKD
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Phenotypic Heterogeneity in PRRT2 Mutations
• Paroxysmal Kinesigenic Dyskinesia
• Benign Familial Infantile Convulsions
• ICCA Syndrome
• Febrile Infantile Convulsions
• Classic Migraine with PKD
• Hemiplegic Migraine
• Episodic Ataxia
Liu et al J Med Genetics,2011;49:79-82
Gurreni and Mink; Neurology 2012;79;2086
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PRRT2 gene Mutations
• Most likely a dominant loss of function
• PRRT2 interacts with SNAP-25 a protein in the SNARE family involved in vesicular fusion to the membrane and is important for neurotransmitter release
• As a transmembrane protein it may form complexes with ion channels and may be important for their function
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PNKD- Genetics
• Mutations in the Myofibrillogenesis regulator gene.(MR-1) on chromosome 2q resulting in a substitution of alanine to valine have been described in most cases of familial PNKD (Lee,2004)
• Later onset PNKD like patients may not have this mutation.
• Some reported PNKD families lack this mutation. (Spacey,2006)
• One new locus for PNKD and generalized epilepsy on chromosome 10q22– a calcium sensitive K channelopathy (Nature Genetics ,2005)
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PNKD-Genetics
• MR-1 gene is predominantly a neuronal protein expressed widely in the cortex hippocampus and the striatum.
• Recent work suggests a problem with mitochondrial targeting sequence (MTS- Ghezzi D, 2009).
• MR-1 gene is homologous to HAGH gene that functions to detoxify methylglyoxal a compound found in coffee and alcohol
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MR-1 Transgenic Mouse
• Attacks precipitated by IP injections of any kind- stress
• Knock-out mice look normal-suggesting that this is a gain of function
• c-Fos right after attack in LGP SNr and STN• The role of Adenosine A-2 A receptor antagonism
is being investigated.
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GLUT 1 deficiency syndrome• Expanding phenotype
– Classical (De Vivo 1991) - majority of cases, usually de novo• DD, seizures, acquired microcephaly, variable ataxia/spasticity/dystonia
– New phenotypes emerging - milder, adult onset, often familial – Infancy onset MD without seizures– Familial PED and epilepsy (+/- haemolytic anaemia), sporadic PED– Carbohydrate responsive phenotypes– PED, Writer’s cramp,migraine and absence seizures– Absence seizures
• DYT 9 – paroxysmal choreoathetosis/spasticity, with episodic ataxia (Auburger 1996) + these twins
– Realignment with DYT 18 (GLUT1-DS due to SLC2A1 mutations)
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OVERLAPS
• Episodic Ataxia 1 Early childhood Provoked by startle Duration minutes Interictal myokymia Autosomal dominant Potassium channel gene
mutation KCNA-1 –12P
• Episodic Ataxia 2 Late childhood Stress,alcohol Minutes to hours Interictal nystagmus Autosomal dominant Calcium channel gene
mutation CACNLIA—19P
Rarely myasthenic syndrome ( Jen et al ,02)
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Overlaps
• Facial myokymia and dystonic/choreic movements (FDFM) is a dominant disorder with dyskinesia that is episodic but may become constant with increasing age.
• Localized to chromosome 3.(Raskind WH,2009).
• Ion channel dysfunction is a well known mechanism for myokymia.
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Paroxysmal Dyskinesias-Management
• Look for an underlying cause especially if the age of onset is atypical as in adulthood
• PKD responds well to anticonvulsants and the patients are exquisitely sensitive to these drugs making monitoring levels unnecessary (almost all anticonvulsants have been used)
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Paroxysmal Dyskinesias Management
• PNKD does not respond well to drugs. Anticonvulsants may be tried and recent reports indicate levitracetam may be beneficial. Alternate day oxazepam, l-dopa and rarely botulinum toxin has been used.
• In rare cases of PNKD thalamic or GPi stimulation has been successfully employed (T.J. Loher et al Neurology 2001,Yamada,2006, Kaufmann,2009)
• Short lasting PHD may respond to anticonvulsants
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Paroxysmal Dyskinesias -Treatment
• PED- Hard to treat. Restrict exercise.
• Some cases respond to levodopa
• In GLUT-1 cases ketogenic diet is advised
• Secondary PDys in MS may respond to carbamazepine and/or acetazolamide
• Underlying disorders must be addressed in other cases of secondary PDys.
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