Presentation on theme: "SAMIH BADARNY Parkinson and other movement disorders clinic Neurology Department Carmel Medical Center- Haifa HYPERKINETIC SYNDROMES."— Presentation transcript:
SAMIH BADARNY Parkinson and other movement disorders clinic Neurology Department Carmel Medical Center- Haifa HYPERKINETIC SYNDROMES
TREMOR Oscillatory, usually rhythmical and regular movements affecting one or more body parts. Usually caused by alternating contraction of agonist and antagonist muscles Definition:
Classification by state of activity Rest Tremor: is present when a limb is fully supported against gravity and the relevant muscles are not voluntarily activated. Action tremor: occurring during any voluntary muscle contraction which includes postural, kinetic, isometric and task specific tremors. Postural tremor: is apparent during the voluntary maintenance of a particular posture voluntary maintenance of a particular posture which is opposed by the force of gravity. which is opposed by the force of gravity.
Kinetic tremor: is evident during any type of movement. movement. Intention or terminal tremor: is the pronounced exacerbation of kinetic tremor towards the end of a goal directed movement. towards the end of a goal directed movement. Task specific tremor: only occurs during the performance of a highly skilled activity performance of a highly skilled activity
Isometric tremor: Occurs when a voluntary muscle contraction is opposed by a rigid stationary object. contraction is opposed by a rigid stationary object. Orthostatic tremor: A 14-16Hz tremor that appears a few seconds after standing and subside on sitting or walking walking
Classification by etiology: Physiological and enhanced physiological: Physiological and enhanced physiological: Present at action. Is more pronounced during periods of fatigue fear or excitement. Results from numerous factors including the heart beat, low pass filtering properties of striated beat, low pass filtering properties of striated muscles, motor neurons firing and muscles, motor neurons firing and synchronization by spindle feed back. synchronization by spindle feed back.
Parkinsonian tremor: Slow 3-5 Hz rest tremor (pill rolling) involving the limbs and/or tongue chin and lips. May be asymmetrical. May be accompanied by postural (“re-mergent”) tremor. (“re-mergent”) tremor.
Dystonic Tremor: A jerky irregular action tremor intermingled with sustained muscular spasms that can last several seconds. May involve the muscles of the neck (tremulous spasmodic torticollis), face (orofacial dyskinesia), trunk and limbs.
Midbrain (“rubral”, “Cerebellar outflow”) tremor: A tremor which is present at rest, worse on posture and is further exacerbated by movement. posture and is further exacerbated by movement. This type of tremor is most commonly seen in MS and brainstem vascular lesions. MS and brainstem vascular lesions. Cerebellar Tremor: A kinetic tremor with marked intentional component. The tremor is usually accompanied by disorders of ocular motility ( dysmetria, nystagmus) incordination, DDK pendular reflexes and unsteady gait.
ESSENTIAL TREMOR Essential tremor (ET) is the most common movement disorder. It is a syndrome characterized by a slowly progressive, rapid (4-12Hz), postural and/or kinetic tremor, usually affecting both upper extremities.
Epidemiology The estimated prevalence of ET is 0.3- 5.6% of the general population. general population. Both sexes are affected equally although head tremor may be more frequent in women. tremor may be more frequent in women. The prevalence of ET increases with age. Age of onset has bimodal peaks - one in late adolescence to early adulthood and a second in adolescence to early adulthood and a second in older adulthood. The mean age at presentation is older adulthood. The mean age at presentation is 35-45 years. 35-45 years. No association has been found between age of onset and severity or disability. onset and severity or disability.
ET- Disability 85% percent of individuals with ET report significant changes in their livelihood and socializing. 15% percent report being seriously disabled by ET.
Decreased quality of life results from both loss of function and embarrassment. In a study of hereditary ET, 25% changed jobs or took early function and embarrassment. In a study of hereditary ET, 25% changed jobs or took early retirement; 65% did not dine out; 30% did not attend parties, shop alone, partake of a favorite hobby or sport, or use public transportation; and 20% stopped driving. retirement; 65% did not dine out; 30% did not attend parties, shop alone, partake of a favorite hobby or sport, or use public transportation; and 20% stopped driving. An estimated 0.5-11.1% of affected individuals seek medical attention
ET- Genetics ET is familial in at least 50-70% of cases. Transmission is autosomal dominant, with incomplete penetrance. Some cases are sporadic with unknown etiology. Two susceptibility loci have been found; The FET1 gene is located at 3q13 and was identified in 75 members of 16 Icelandic families. identified in 75 members of 16 Icelandic families. ETM2 gene at 2p25-22, was identified in 15 members of 4 generations of Americans. generations of Americans.
ET-pathophysiology Two neural circuits have been proposed to explain the pathophysiology of tremor. 1.A basal ganglia-thalamocortical motor loop involving the globus pallidum, anterior VL thalamic nucleus, and supplementary motor area may be affected in extrapyramidal tremor diseases such as PD and ET. 2.Another loop, involving the cerebellum, posterior VL thalamic nucleus, and motor cortex, may explain tremor of other etiologies (eg, cerebellar tremor).
Definition: Dystonia is a movement disorder characterized by sustained muscle contractions that frequently cause twisting or repetitive movements and abnormal, sometimes painful, postures or positions
Classification : Etiology primary secondary Distribution of body regions affected Age of onset
Etiology: Primary Dystonia the single sign History,clinical and laboratory findings are normal Usually action dystonia Secondary Associated with hereditary neurological diseases Environmental (birth trauma or drug use) Psychogenic dystonia
Distribution of body: Focal Blepharospasm, cervical, laryngeal, hand. Segmental Meige, OMD Multifocal Different types Hemidystonia Vascular or CP Generalized Torsion dystonia Dopa responsive dystonia
Pathophysiology: Is not known Reduced inhibition at various levels of motor system Sensory motor disintegration of BG and motor cortex. Alteration of discharge rate in GPI
Treatment : Levodopa and dopamine agonists Anticholinergics Clonazepam Baclofen Atypical neuroleptics Tetrabenazine Botulinum toxin type A ( Botox, Dysport)
BOTULINUM TOXIN TYPE A (BTX-A) BTX-A acts as presynaptically at nerve terminals to prevent release of acetylcholine. CHEMICAL DENERVATION CHEMICAL DENERVATION
LL L M S Dimention coefficient 19s 16s 12s 7s Molecular weight (kdaltons) 900 500 300 150 haemagglutinin Non-toxic protein neurotoxin Toxin type A B C 1 D E F G Complexes LL,L,M,S L,M,s L,M,S L,M,S M,S M,s 7
Sites of action of BTX-A Alpha motor neuron (Neuro-muscular junction) Gamma motor neurons (Muscle spindles) Autonomic nervous system (Cholinergic nerve endings) C and A delta fibers Central nervous system?
BTX-A Side Effects Over Weakness Local Pain Blue Spots Distant Effects - Rare Lost of Efficacy
CHOREOATHETOSIS Chorea (dance) - irregular, rapid, uncontrolled, involuntary,excessive dyskinetic movements. Athetosis (not fixed) - slow,sinuous writhing movements especially in the hands. Ballismus- a form of chorea with large amplitude of the affected extremity.
Chreoathetosis seems to result from damage of indirect pathways of the BG. These indirect pathways normally inhibit the unwanted movements.
TICS AND TOURETTE Tics are involuntary movements or sounds Motor and vocal, simple or complex Non rhythmic and repetitious Sporadic and sudden Simple motor- fast, brief involve one or some muscles. Complex motor- sequent and simultaneous movements, produce as purposeful movements
Simple vocal-solitary meaningless sounds and noise, as sniffing, throat clearing, humming or coughing Complex vocal-meaningful utterances and and verbalizations as partial or complete words and repeated, coprolalia, echolalia and palilalia
Spectrum of tic disorders: Transient tic disorder Childhood and adolescence Four times boys more than girls Motor and or vocal tics Maximum one year Chronic single or multiple tic disorder Motor or vocal not both More than one year
TOURETTE ’ S SYNDROME (TS) Genetic, childhood onset ( 1-20 years) Motor and vocal tics Accompanied with ADHD (80%), OCD, poor impulse control, anxiety, mood disorders and behavior disturbances (20%) Males > female (4:1) Affect 0.1- 0.3 of general population No definitive diagnostic test
Etiology of TS Is not known, 80% is genetic Synaptic neurotransmission? Disinhibition of striatal-thalamic-cortical circuitry Environmental factors PANDAS? Treatment Neuroleptic agents(antagonists and depletors) Antidepressants Antianxiety BTX
MYOCLONUS Definition: Sudden, brief, shock-like movements which can be positive or negative (asterixis or flapping tremor). Anatomic : cortical subcortical spinal peripheral (HFS)
TARDIVE DYSKINESIA (TD) Sigwald (1959) first described TD Involuntary movements typicallly of oro- buco- lingual muscles,but any muscle in the body can be involved related to antipsychotic drugs. Mean prevalence 25% Annual incidence rate-5%in young and 12% in elderly.
Mechanism: hypersensitivity and excessive function of dopaminergic neurotransmitters in BG. High risk- young, female, affective disorders, poor treatment response to neuroleptics, dose duration and type of drug holidays or interruption or increase dose (mask TD), anticholinergics, lithium, parkinsonism.
Treatment of TD: Vit E Valproic acid Clonazepam Propranolol Ca channel blockers Dopamine agonists Atypical neuroleptics Dopamine Depletor- Tetrabenazine
Tetrabenazine (Xenazine,Nituman) Has two modes of action: 1- blocking postsynaptic dopamine receptors 1- blocking postsynaptic dopamine receptors 2- depleting dopamine stores in presynaptic vesicles 2- depleting dopamine stores in presynaptic vesicles reduced transmission along dopamine pathways. pathways. Depleting stores of biogenic amines: e.g., serotonin, noradrenaline, as well as dopamine binds to vesicular monoamine transporter 2 (VMAT2) VMAT2 found primarily in the CNS.