ATAXIA

Ask the following questions:

1. Is there vertigo, tinnitus, or deafness? Any one of these three signs and symptoms should suggest Ménière's disease or other labyrinthine disease as well as eighth nerve pathology.
2. Are there headaches, nystagmus, or papilledema? These signs should suggest a cerebellar tumor or acoustic neuroma.
3. Are there other neurologic signs? If there are long tract signs such as hyperactive reflexes and loss of vibratory or position sense, one should consider multiple sclerosis, pernicious anemia, or basilar artery insufficiency. If there are glove and stocking hypoesthesia and hypoactive reflexes, one should consider peripheral neuropathy or tabes dorsalis.
4. Is the ataxia worse in the dark? This is a sign that the dorsal column or peripheral nerve is affected, and one should look for peripheral neuropathy, pernicious anemia, multiple sclerosis, and Friedreich's ataxia. One should also look for tabes dorsalis.
5. Is there a secondary gain? Hysterical patients and patients who are malingering will often show a completely normal neurologic examination, but be unable to walk or stand without staggering. The author has been particularly impressed with patients applying for long-term disability who stagger a great deal without support, but as soon as support in the form of a cane is given, their ataxia completely clears up.

DIAGNOSTIC WORKUP

The wise clinician should consider a neurologic referral at the outset. If there is vertigo, tinnitus, or deafness, then an audiogram and caloric testing should be done. If these suggest eighth nerve damage, then a CT scan or MRI of the brain should be done. Headaches, sustained nystagmus, or papilledema are other indications for a CT scan or MRI. If multiple sclerosis is suspected, MRI of the brain is very useful, as well as spinal fluid for gamma globulin and myelin basic protein. Perhaps VEP, brain stem evoked potential (BSEP), or SSEP studies should be done. If vascular disease is suspected, magnetic resonance angiography will allow assessment of the vertebral-basilar arteries. If this is not available, four-vessel cerebral angiography may be utilized. Patients with hypoactive reflexes and glove and stocking hypoesthesia and hypalgesia will need a neuropathy workup . When there is ataxia in the presence of a normal neurologic examination, referral to a psychologist for psychometric testing should be done.

Book Source Details

• Book Title: Algorithmic Diagnosis of Symptoms and Signs
• Author(s): R. Douglas Collins
• Year of Publication: 2003
• Copyright Details: Algorithmic Diagnosis of Symptoms and Signs, Copyright © 2003 Lippincott Williams & Wilkins.

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Copyright Details: Algorithmic Diagnosis of Symptoms and Signs, Copyright © 2008 Williams & Wilkins.

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More About This Book: Title: Algorithmic Diagnosis of Symptoms and Signs Authors: R. Douglas Collins Publisher: Lippincott Williams & Wilkins Copyright: 2003 ISBN: 0-7817-3805-9

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