:: Volume 5, Issue 1 And 2 (5 1998) ::
aud 1998, 5(1 And 2): 19-24 Back to browse issues page
Horizontal canal Benign positional vertigo
Mohtaram Najafi
Abstract:   (13154 Views)

Benign paroxysmal positional vertigo (BPPV) is a syndrome characterized by transient episodes of vertigo in association with rapid changes in head position in Dix-Halpike Maneuver. This kind of vertigo is thought to be caused by migration of otoconial debris into canals other than the posterior canal, such as the anterior or lateral canals. It is also theoretically possible for many aberrant patterns of BPPV to occur from an interaction of debris in several canals, location of debris within the canal, and central adaptation patterns to lesions.he symptoms of BPPV are much more consistent with free-moving densities (canaliths) in the posterior SCC rather than fixed densities attached to the cupula. While the head is upright, the particles sit in the PSC at the most gravity-dependent position. The best method to induce and see vertigo and nystagmus in BPPV of the lateral semicircular canal is to rotate head 90°while patient is in the supine position, nystagmus would appear in the unaffected side weaker but longer than the affected side. canal paresis has been described in one third of the patients with BPPV. Adaptation which is one of the remarkable features of BPPV in PSC is rarely seen in LSC. Rotations of 270° or 360° around the yaw axis (the so-called barbecue maneuver) toward the unaffected ear are popular methods for the treatment of geotropic HC-BPPV. These maneuvers consist of sequential head turning of 90° toward the healthy side while supine. With these maneuvers, the free-floating otoconial debris migrates in the ampullofugal direction, finally entering the utricle through the nonampullated end of the horizontal canal. This kind of vertigo recovers spontaneously more rapidly and suddenly.

Keywords: Horizontal Semi circular canals, Benign positional vertigo
Full-Text [PDF 3931 kb]   (2544 Downloads)    
Type of Study: - |
Accepted: 2013/09/28 | Published: 2017/11/7


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Volume 5, Issue 1 And 2 (5 1998) Back to browse issues page