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CNS Causes of Vertigo: Differential Diagnoses & Workup
Updated: Sep 10, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
- Multimedia
Workup
Laboratory Studies
Few laboratory studies facilitate the diagnosis of the CNS causes of vertigo.
If vertigo is accompanied by prolonged nausea and vomiting in elderly patients, monitoring and replacing fluids and electrolytes is prudent.
In the rare case of suspected Lyme neuroborreliosis, serology for Lyme disease with enzyme-linked immunosorbent assay (ELISA), Western blot analysis, and lymphocyte antigen stimulation assay are indicated. Obtain cerebrospinal fluid for Lyme antibody tests and polymerase chain reaction analysis to evaluate for Borrelia burgdorferi DNA.
Imaging Studies
Imaging studies are indicated when the symptoms are suspected to result from ischemia. MRI and MR angiography are the most helpful studies in assessing posterior circulation disorders and acute infarction. Diffusion-weighted MRI is sensitive and specific for early detection and differentiation between vasogenic and cytotoxic edema in patients with acute neurologic deficits.
Other Tests
Electronystagmography (ENG) is the most used vestibular test. When combined with the patient’s history and examination, the results of the ENG can be used to support a diagnosis of a peripheral or central etiology.1,2 Nystagmus patterns may be spontaneous or may be elicited by a change in gaze, head position, or head shake. Patterns of central and peripheral nystagmus were discussed in the Clinical section. Abnormalities in smooth pursuit or saccades are typically central in origin.
Formal evaluation with vestibular testing is indicated if the diagnosis is not apparent after obtaining a history and performing a physical examination. Vestibular testing can facilitate distinction between central, peripheral, and mixed causes of imbalance and vertigo. The test battery assesses labyrinthine function with caloric testing, rotational chair testing, and vestibular evoked myogenic potential. Oculomotor integrity is evaluated with eye tracking during smooth pursuit, saccades, and optokinetic stimulation. The evaluation of spontaneous and gaze-evoked nystagmus can provide critical clues to central pathology.
Abnormalities found by oculomotor testing that suggest a central balance problem include saccade inaccuracy and smooth pursuit dysmetria. Failure to suppress nystagmus with visual fixation is often a sign of disease that affects the cerebellar flocculus or neural connections between the flocculus and the vestibular nuclei.
Positional testing with infrared oculography can be used to reveal nystagmus and to clearly define nystagmus patterns. Multidirectional nystagmus, spontaneous nystagmus, or positional nystagmus that is downbeat, torsional, or dissociated suggests a central lesion.
If symptoms suggest hypoperfusion, embolic events, or arrhythmia as the cause, perform a complete cardiac and peripheral vascular examination, including ECG, Holter monitoring, echocardiography, and carotid and vertebral Doppler ultrasonography.
More on CNS Causes of Vertigo |
| Overview: CNS Causes of Vertigo |
Differential Diagnoses & Workup: CNS Causes of Vertigo |
| Treatment & Medication: CNS Causes of Vertigo |
| Follow-up: CNS Causes of Vertigo |
| Multimedia: CNS Causes of Vertigo |
| References |
| Further Reading |
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References
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[Guideline] Fife TD, Iverson DJ, Lempert T, Furman JM, Baloh RW, Tusa RJ, et al. Practice parameter: therapies for benign paroxysmal positional vertigo (an evidence-based review): report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology. May 27 2008;70(22):2067-74. [Medline].
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Further Reading
Clinical guidelines
Fife TD, Iverson DJ, Lempert T, Furman JM, Baloh RW, Tusa RJ, Hain TC, Herdman S, Morrow MJ, Gronseth GS, Quality Standards Subcommittee, American Academy of Neurology. Practice parameter: therapies for benign paroxysmal positional vertigo (an evidence-based review): report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology 2008 May 27;70(22):2067-74. 21
Bhattacharyya N, Baugh RF, Orvidas L, Barrs D, Bronston LJ, Cass S, Chalian AA, Desmond AL, Earll JM, Fife TD, Fuller DC, Judge JO, Mann NR, Rosenfeld RM, Schuring LT, Steiner RW, Whitney SL, Haidari J, American Academy of Otolaryngology-Head and Neck Surgery Foundation. Clinical practice guideline: benign paroxysmal positional vertigo. Otolaryngol Head Neck Surg 2008 Nov;139(5 Suppl 4):S47-81. 22
Turski PA, Seidenwurm DJ, Davis PC, Brunberg JA, De La Paz RL, Dormont PD, Hackney DB, Jordan JE, Karis JP, Mukherji SK, Wippold FJ II, Zimmerman RD, McDermott MW, Sloan MA, Expert Panel on Neurologic Imaging. Vertigo and hearing loss. [online publication]. Reston (VA): American College of Radiology (ACR); 2006. 8 p.
Keywords
CNS causes of vertigo, vertigo, dizziness, imbalance, disequilibrium, migraine-associated vertigo, presyncopal, vertebrobasilar artery insufficiency, vestibular function, VBA insufficiency, posterior fossa cerebrovascular disease, cerebellar tumors, temporal lobe tumors, brainstem lesions, cerebellopontine angle tumors, CPA tumors, multiple sclerosis, posttraumatic vertigo, familial periodic ataxia syndromes, Lyme neuroborreliosis, psychogenic vertigo, migraine-associated vertigo, migraine, migraine headache, nystagmus


Differential Diagnoses & Workup: CNS Causes of Vertigo