Vertigo (medical): Difference between revisions
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==Pathophysiology== | ==Pathophysiology== | ||
===Benign positional vertigo=== | ===Benign positional vertigo=== | ||
Most cases of benign positional vertigo are due to canaliths or otoliths (calcium carbonate crystals) in the posterior canal that stimulate the cupula. | Most cases of benign positional vertigo are due to canaliths or otoliths (calcium carbonate crystals) in the posterior canal that stimulate the cupula. Disease of the horizontal canal accounts for 10-17% of cases.<ref name="pmid18505980">{{cite journal |author=Fife TD, Iverson DJ, Lempert T, ''et al'' |title=Practice Parameter: Therapies for benign paroxysmal positional vertigo (an evidence-based review): Report of the Quality Standards Subcommittee of the American Academy of Neurology |journal=Neurology |volume=70 |issue=22 |pages=2067–74 |year=2008 |month=May |pmid=18505980 |doi=10.1212/01.wnl.0000313378.77444.ac |url= |issn=}}</ref> | ||
==Diagnosis== | ==Diagnosis== | ||
Revision as of 07:56, 29 May 2008
Vertigo is a well-recognized medical condition that consists of the illusion of movement, usually of turning. Most often, patients with vertigo "see" the room and world spinning around them, but sometimes that hallucination of movement is centered on the body, instead, and the patient feels as if he or she is spinning within the room or other setting. In severe vertigo, there is often nausea and even vomiting.
Common conditions causing vertigo
Unusual diagnoses causing vertigo
Pathophysiology
Benign positional vertigo
Most cases of benign positional vertigo are due to canaliths or otoliths (calcium carbonate crystals) in the posterior canal that stimulate the cupula. Disease of the horizontal canal accounts for 10-17% of cases.[1]
Diagnosis
Skew deviation (vertical misalignment) suggests a central lesion.[2]
The Dix–Hallpike maneuver can diagnose positional vertigo (BPPV):[1]
- Posterior canal BPPV causes "upbeating and torsional nystagmus with the top pole of rotation beating toward the affected (downside) ear"[1]
- Horizontal canal BPPV causes "horizontal geotropic (toward the ground) or apogeotropic (away from the ground) direction-changing paroxysmal positional nystagmus"[1]
- Anterior canal BPPV
Treatment
Benign positional vertigo
Clinical practice guidelines by the American Academy of Neurology address the treatment of benign positional vertigo.[1] The guidelines state:
- Canalith repositioning procedure may treat benign positional vertigo due to the posterior semicircular canal
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Fife TD, Iverson DJ, Lempert T, et al (May 2008). "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 70 (22): 2067–74. DOI:10.1212/01.wnl.0000313378.77444.ac. PMID 18505980. Research Blogging.
- ↑ Cnyrim CD, Newman-Toker D, Karch C, Brandt T, Strupp M (2008). "Bedside differentiation of vestibular neuritis from central "vestibular pseudoneuritis"". J. Neurol. Neurosurg. Psychiatr. 79 (4): 458-60. DOI:10.1136/jnnp.2007.123596. PMID 18344397. Research Blogging.