Ataxia

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Ataxia
ICD-10 R27.0
ICD-9 781.3

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor in Chief: M.Umer Tariq [2] Raviteja Guddeti, M.B.B.S. [3]

Synonyms and keywords: unsteady gait, ataxy, staggering gait

Overview

Ataxia (from Greek α- [used as a negative prefix] + -τάξις [order], meaning "lack of order") is a neurological sign and symptom consisting of gross incoordination of muscle movements. [1] Ataxia is an aspecific clinical manifestation implying dysfunction of parts of the nervous system that coordinate movement, such as the cerebellum. Several possible causes exist for these patterns of neurological dysfunction. The term "dystaxia" is rarely used as a synonym.

The International Ataxia Awareness Day is observed on September 25th each year.[2]

Types of ataxia

Cerebellar ataxia

The term cerebellar ataxia is employed to indicate ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits, such as antagonist hypotonia, asynergy, dysmetria, dyschronometria, and dysdiadochokinesia. How and where these abnormalities manifest depend on which cerebellar structures are lesioned, and whether the lesion is bilateral or unilateral. Vestibulo-cerebellar dysfunction presents with postural instability, in which the person tends to separate the feet on standing to gain a wider base, and avoid oscillations (especially posterior-anterior ones); instability is therefore worsened when standing with the feet together (irrespective of whether the eyes are open or closed: this is a negative Romberg's test). Spino-cerebellar dysfunction presents with a wide-based "drunken sailor" gait, characterised by uncertain start and stop, lateral deviations, and unequal steps. Cerebro-cerebellar dysfunction presents with disturbances in carrying out voluntary movements, including intention tremor (coarse trembling, accentuated over the execution of voluntary movements, possibly involving the head and eyes as well as the limbs and torso), peculiar writing abnormalities (large, unequal letters, irregular underlining), and a peculiar pattern of dysarthria (slurred speech, sometimes characterised by explosive variations in voice intensity despite a regular rhythm).

Sensory ataxia

The term sensory ataxia is employed to indicate ataxia due to loss of proprioception (sensitivity to joint and body part position), which generally depends on dysfunction of the dorsal columns of the spinal cord, since they carry proprioceptive information up to the brain; in some cases, the cause may instead be dysfunction of the various brain parts that receive that information, including the cerebellum, thalamus, and parietal lobes. Sensory ataxia presents with an unsteady "stomping" gait with heavy heel strikes, as well as postural instability that is characteristically worsened when the lack of proprioceptive input cannot be compensated by visual input, such as in poorly lit environments. Doctors can evidence this during physical examination by having the patient stand with his / her feet together and eyes shut, which will cause the patient's instability to markedly worsen, producing wide oscillations and possibly a fall (this is called a positive Romberg's test). Worsening of the finger-pointing test with the eyes closed is another feature of sensory ataxia. Also, when the patient is standing with arms and hands extended toward the examiner, if the eyes are closed, the patient's finger will tend to "fall down" and be restored to the horizontal extended position by sudden extensor contractions ("ataxic hand").

Vestibular ataxia

The term vestibular ataxia is employed to indicate ataxia due to dysfunction of the vestibular system, which in acute and unilateral cases is associated with prominent vertigo, nausea and vomiting. In slow-onset, chronic bilateral cases of vestibular dysfunction, these characteristic manifestations may be absent, and dysequilibrium may be the sole presentation.

Causes

Common Causes

Causes by Organ System

Cardiovascular Arteriosclerosis, Circulation disorders in area of brain stem, Morgagni's Syndrome
Chemical / poisoning 2,4,6-Trichlorophenol, Acrylamide, Aftershave, Amitraz, Aniline, Antifreeze, Apple seed poisoning, Arizona Bark Scorpion poisoning, Benzene, Blue-ringed octopus poisoning, Buckeye poisoning, Carbon monoxide poisoning, Death Camas poisoning, English Ivy poisoning, Gasoline, Lantana poisoning, Lead, Mayapple poisoning, Mercury, Mescal poisoning, Minamata disease, Mistletoe poisoning, Thallium poisoning, Tolterodine toxicity, Toxic mushrooms -- Anticholinergic, Toxic mushrooms -- Monomethylhydrazine, Toxic mushrooms -- Psychedelic, Varnish makers' and painters' Naptha, Xylene
Dermatologic No underlying causes
Drug Side Effect Amiodarone, Barbituates, Benzodiazepines, Ethosuximide, Gabapentin, Lamotrigine, Levetiracetam, Metronidazole, Morphine, Oxcarbazepine, Primidone
Ear Nose Throat No underlying causes
Endocrine

Diabetic neuropathy, Hypothyroidism,

Environmental No underlying causes
Gastroenterologic

Cirrhosis, Malabsorption,

Genetic

Familial periodic ataxia, Fredreich's Ataxia, Hartnup Syndrome, Hereditary spastic paraparesis, Inherited neuropathies,

Hematologic

Acanthocytosis, Ataxia-teleangiectasia,

Iatrogenic No underlying causes
Infectious Disease

Chickenpox, HIV infection, Smallpox,

Musculoskeletal / Ortho

Myopathy,

Neurologic Acute Disseminated Encephalomyelitis, Alexander Syndrome, Alpers Syndrome, Arachnoid Cysts, Arnold-Chiari Malformation, ARTS syndrome, Ataxia deafness reardon type, Ataxia tapetoretinal degeneration, Ataxia telangiectasia / Louis-Bar syndrome, Ataxia-oculomotor apraxia syndrome, Basal ganglia calcification, Basilar artery migraine, Vertebro-basilar artery ischemia, Brain abscess, Brain cancer, Brain cyst, Brain injury, Brainstem or cortical lesions, Central nervous system lymphoma, primary, Cerebellar abscess, Cerebellar ataxia, Cerebellar cortex atrophy, Cerebellar degeneration, Cerebellar haemorrhage, Cerebellar heredoataxia, Cerebellar hypoplasia, Cerebellar infarct, Cerebellar mass, Cerebral Amyloid Angiopathy, Familial, Cerebral hemorrhage, Cerebral infarction, Cerebral palsy, Cerebrorenodigital syndrome, Cerebrovascular accident, Ceroid lipofuscinosis, Cervical myelopathy, Chorea familial benign, Chronic progressive traumatic encephalopathy, Cockayne syndrome, Combarros Calleja Leno syndrome, Corneal cerebellar syndrome, Creutzfeldt-Jakob disease, Cutler-Bass-Romshe syndrome, Dandy-Walker Syndrome, Dementia pugilis, Demyelinating disorder, DeSanctis-Cacchione syndrome, Dinno-Shearer-Weisskopf syndrome, Dravet syndrome, Dykes-Markes-Harper syndrome, Dysequilibrium syndrome, Encephalitis, Encephalocele frontal, Epiphyseal tumor, Episodic ataxia, Erythrokeratodermia with ataxia, Feline spongiform encephalopathy, Fisher's Syndrome, Friedreich's ataxia, Frontal lobe lesion, GALOP Syndrome (gait disorder, autoantibodies, late age onset, polyneuropathy), Glioma, Granulomatous Angiitis of the central nervous system, Guillain-Barré syndrome, Hallervorden-Spatz disease, Heidenhain syndrome, Hepatocerebral degeneration, Hydrocephalus, Infantile polymyoclonus, Inherited neuropathies, Joubert syndrome, Juvenile pilocytic astrocytoma, Kearns-Sayre Syndrome, Kuru, Lhermitte-McAlpine syndrome, Machado-Joseph Disease, Macrogyria, pseudobulbar palsy and mental retardation, Mann Syndrome, Marinesco-Sjogren-like syndrome (MSLS), Marinescu-Garland Syndrome, Medulloblastoma, Meinecke syndrome, Meningoencephalocele, Mental retardation progressive spasticity, X-linked, Mental retardation, X-linked, with cerebellar hypoplasia and distinctive facial appearance, Metachromatic Leukodystrophy, Miller Fisher Syndrome, Mitochondrial encephalomyopathy, Mononeuropathy/radiculopathy affecting the lower extremities, Multiple sclerosis, Myelopathy, Myoclonus, Neuronal intranuclear hyaline inclusion disease, Normal pressure hydrocephalus, Olivopontocerebellar atrophy, Opsoclonus myoclonus syndrome, Parietal lobe lesion, Parkinson's disease, Partington X-linked mental retardation syndrome, Pelizaeus-Merzbacher disease, Peripheral neuropathy, Polyneuritis, Polyneuropathy, Post-infective polyradiculopathy, Posterior column ataxia with retinitis pigmentosa, Posterior fossa tumor, Progressive Multifocal Leukoencephalopathy, Reardon-Wilson-Cavanagh syndrome, Rett syndrome, Rhombencephalosynapsis, Roussy-Levy syndrome, Schroer-Hammer-Mauldin syndrome, Segawa syndrome, autosomal recessive, Shy-Drager syndrome, Spastic paraplegia, Spinal cord compression (and pressure on dorsal nerve roots), Spinal cord tumor, Spinocerebellar ataxia, Spinocerebellar degenerescence, book type, Stroke, Susac syndrome, Tabes dorsalis, Telencephalic leukoencephalopathy, Thalamic syndrome, Thoracic dysplasia -- hydrocephalus syndrome, Tranebjaerg-Svejgaard syndrome, Transient ischemic attack (TIA), Transverse myelitis, Vascular dementia, Vertebral Artery Dissection, Vertebrobasilar dolichoectasia, Vertigo, benign paroxysmal, Westphal's Disease, Wilson's Disease
Nutritional / Metabolic

Alcohol, Alpha-beta lipoproteinemia, GM2-gangliosidoses, Thiamine deficiency, Wilson's Disease,

Obstetric/Gynecologic No underlying causes
Oncologic

Epiphyseal tumor, Paraneoplastic syndrome,

Opthalmologic No underlying causes
Overdose / Toxicity

Intoxication,

Psychiatric No underlying causes
Pulmonary No underlying causes
Renal / Electrolyte No underlying causes
Rheum / Immune / Allergy

Fisher's Syndrome,

Sexual No underlying causes
Trauma

Brainstem or cortical lesions, Frontal lobelesion, Mann Syndrome, Parietal lobelesion,

Urologic No underlying causes
Miscellaneous Mitochondrial cytopathy,

Causes by Alphabetical Order


Causes of ataxia

The three types of ataxia have overlapping causes, and can therefore either coexist or occurr in isolation.

Focal lesions

Any type of focal lesion of the central nervous system (such as stroke, brain tumour, multiple sclerosis will cause the type of ataxia corresponding to the site of the lesion: cerebellar if in the cerebellum, sensory if in the dorsal spinal cord (and rarely in the thalamus or parietal lobe), vestibular if in the vestibular system (including the vestibular areas of the cerebral cortex).

Exogenous substances

Exogenous substances that cause ataxia mainly do so because they have a depressant effect on central nervous system function. The most common example is ethanol, which is capable of causing overlapping cerebellar and vestibular ataxia. Other examples include both prescription drugs (e.g. most antiepileptic drugs have cerebellar ataxia as a possible unwanted effect) and recreational drugs (e.g. ketamine, PCP).

Vitamin B12 deficiency

Vitamin B12 deficiency may cause, among several neurological abnormalities, overlapping cerebellar and sensory ataxia.

Causes of isolated sensory ataxia

Peripheral neuropathies may cause generalised or localised sensory ataxia (e.g. a limb only) depending on the extent of the neuropathic involvement. Spinal disorders of various types may cause sensory ataxia from the lesioned level below, when they involve the dorsal columns.

Non-hereditary cerebellar degeneration

Non-hereditary causes of cerebellar degeneration include chronic ethanol abuse, paraneoplastic cerebellar degeneration, high altitude cerebral oedema, coeliac disease, and normal pressure hydrocephalus.

Hereditary ataxias

Ataxia may depend on hereditary disorders consisting of degeneration of the cerebellum and/or of the spine; most cases feature both to some extent, and therefore present with overlapping cerebellar and sensory ataxia, even though one is often more evident than the other. Hereditary disorders causing ataxia include autosomal dominant ones such as spinocerebellar ataxia, episodic ataxia, and dentatorubropallidoluysian atrophy, as well as autosomal recessive disorders such as Friedreich's ataxia (sensory and cerebellar, with the former predominating), ataxia-telangiectasia (sensory and cerebellar, with the latter predominating), and abetalipoproteinaemia. An example of X-linked ataxic condition is the rare fragile X-associated tremor/ataxia syndrome.

Treatment

There is no specific treatment for ataxia as such, altough there may be for the underlying cause. The disability of ataxia may be reduced by physical therapy, including exercises, along with leg braces or shoe splints, if foot alignment has been affected; a cane or walker is often used in the effort to prevent falls.

References

  1. Template:Dorlands
  2. "National Ataxia Foundation - International Ataxia Awareness Day". Retrieved 2008-03-25.

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