ATAXIA and Multiple Sclerosis

ATAXIA affects so many of us with MS, that I had to post this information which I obtained from Multiple Sclerosis.org


Ataxia is incoordination caused by dysfunction to sensory nerve inputs, motor nerve outputs or the processing of them. It is not the result of muscular weakness. Ataxia is most often applied to unsteadiness in walking but it also refers to upper body incoordination and dysfunction in eye movements and speech.
Ataxia is common in multiple sclerosis but is also seen in several other conditions including diabetic polyneuropathy, acute transverse myelitis, vacuolar myelopathy, tumor or cord compression and hereditary forms of ataxia.
There are three types of ataxia, all of which are seen in MS:

1. Cerebellar Ataxia
This is caused by lesions in the cerebellum or in the parts of the brain that connect to it, such as the cerebellar peduncles, the pons or the red nucleus
 
Because the cerebellum is responsible for synchronising voluntary muscle movement throughout the body, cerebellar ataxia can result in:  
• Uncoordinated walking - gait ataxia.
• Reduced control of range of movement such as over- or under-shooting targets - dysmetria.
• Inability to maintain a steady posture - hypotonia.
• An inability to maintain a steady rhythm - dysdiadochokinesia.
• Shaking when attempting fine movements - intention tremor.
• An inability to coordinate the muscles involved in speech - dysarthria.
• Jittery eye movements - nystagmus.
• 
  
2. Vestibular Ataxia
In multiple sclerosis, vestibular ataxia is caused lesions to brainstem and the vestibular nuclei. In other conditions, it can also result from damage to the eighthcranial nerve leading from the balance organs in the inner ear. Vestibular Ataxia can result in:
• Loss of balance.
• Dizziness, nausea and vomitting - vertigo.
• Jittery eye movements - nystagmus.
• 
  
3. Sensory (Proprioceptive) Ataxia
This results from dysfunction to position sensing (proprioceptive) nerve inputs. This means that the brain is confused as to the position of limbs. Sensory Ataxia results in:
• Loss of position sense - not knowing exactly where your limbs hands and feet are.
• The inability to detect vibrations.
• An unstable stance - Romberg's sign.

This table shows the main characteristics of the three forms of ataxia (after Carlos Eduardo Reis):
 

	Cerebellar	Vestibular	Sensory
Dysarthria	May be present	Absent	Absent
Nystagmus	Often present	Present	Absent
Vertigo	May be present	Present	Absent
Limb ataxia	Usually present	Absent	Present(only in the legs)
Stance	Unable to stand with feet together	May be able to stand with feet together	Able to stand with feet together and eyes open, but unable with eyes closed
Vibratory and position sense	Normal	Normal	Impaired
Ankle reflexes	Normal	Normal	Depressed or absent

Ataxia Links:
MedStudents - Neurology
Ataxias: Classification
Multiple Sclerosis Glossary: Ataxia
GeneClinics: Ataxia Overview
Movement, uncoordinated - Overview
Sensory: Large Fiber
Effect of Cannabinoids on Spasticity and Ataxia in Multiple Sclerosis

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