[Horizontal canal benign paroxysmal positional vertigo—its affected side and horizontal semicircular canal function]

Nobuya Fujita, Toshiaki Yamanaka, Hideyuki Okamoto, Hiroshi Hosoi
Nihon Jibiinkoka Gakkai Kaiho 2005, 108 (3): 202-6
We report horizontal canal BPPV (HC-BPPV) targeting its pathophysiology, the affected side, and the function of the horizontal semicircular canal, together with a review of the literature. Subjects were 13 patients with HC-BPPV visiting our vertigo outpatient clinic at Nara medical university hospital and a related hospital in the 2.5 years from January 2000 to June 2002. Subjects were classified into 7 with canalolithiasis and 6 patients of cupulolithiasis after a neurotological examination. CP was positive in 54% of all patients, 71% of those with canalolithiasis, and 33% of those with cupulolithiasis. To determine the affected side in HC-BPPV, we used the affected side by using the law of Ewald in canalolithaisis patients and the detection of a neutral diminishing nystagmus in cupulolithiasis patients. CP positive in caloric testing indicated insignificant dysfunction of the horizontal semicircular canal in canalolithiasis patients compared to that in cupulolithasis patients. The mechanism behind caloric nystagmus was thought to be a convection of endolymphatic fluid interrupted consequently by an otolith in the semicircular canal in canalolithiasis patients. In contrast, CP was positive in cupulolithiasis patients regarded as having no convection of endolymphatic fluid. The mechanism causing a difference in caloric test results between canalolithiasis and cupulolithiasis patients thus requires a larger patient population and further examination to be conclusive.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Trending Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"