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  • Nystagmus
  • First, when otolithic particles jam in the narrow semicircular canals ('canalith jam') [ 5 ], the resulting nystagmus does not show characteristic directional changes in different head positions, but rather a constant direction regardless of head position. (e-ceo.org)
  • ampulla
  • At one end of each of the semicircular canals is a dilated sac called an osseous ampulla which is more than twice the diameter of the canal. (wikipedia.org)
  • The aim of this study is to verify the hypothesis that free-floating particles could sometimes localize into the distal portion of the non ampullary arm of the posterior semicircular canal (PSC) so that assuming the Dix-Hallpike's positions, the clot could move towards the ampulla eliciting a inhibitory torsional-down beating paroxysmal positional nystagmus (PPNy), instead of typical excitatory torsional-up beating PPNy. (hindawi.com)
  • BPPV
  • 204 patients (BMI range 25-30) with a diagnosis of BPPV of vertical semicircular canals were randomly divided in two groups treated with two different maneuvers: Galletti-Contrino (Group A) and Semont-Toupet manoeuvre (Group B). The results were compared with those obtained from a control group (204 non-overweight subjects with BPV of vertical semicircular canals. (springer.com)
  • Galletti-Contrino manoeuvre seems to be significantly more effective than Semont-Toupet manoeuvre in the treatment of BPPV of posterior semicircular canal and may be preferential in patients with limited body movements. (springer.com)
  • Current clinical research focused on diagnosing and treating various types of BPPV, according to the semicircular canal involved and according to the implicated pathogenetic mechanism. (nih.gov)
  • Cases of multiple-canal BPPV have been specifically investigated because until recently these were resistant to treatment with standard canalith repositioning procedures. (nih.gov)
  • When otoconia is present in the ipsilateral (right) posterior canal (b), the maneuver causes its movement along the lumen of the canal, inducing BPPV. (nih.gov)
  • In Table 1, the various types of BPPV nystagmus are described, according to the involved semicircular canal and the side of involvement. (nih.gov)
  • Are the otoconia crystals removed from semicircular canal before the surgeon puts a plug during canal occlusion for bppv vertigo? (healthtap.com)
  • Patients
  • Patients often avoid loud noises which may be sufficient treatment, however for those who are debilitated by their symptoms surgical plugging of the superior canal can be very beneficial in alleviating the symptoms. (menieres.org.uk)
  • Cone beam computed tomography imaging of superior semicircular canal morphology: a retrospective comparison of cleft lip/palate patients and normal controls. (semanticscholar.org)
  • contralateral
  • When otoconia is present in the contralateral (left) posterior canal (a), the maneuver does not cause any movement of the otoconia, because the head rotates orthogonally to the plane of the involved canal and the maneuver is negative. (nih.gov)
  • unilateral
  • A SVIN was significantly more often observed in unilateral than bilateral semi-circular-canal dehiscences (P = 0.009) and with a higher slow phase velocity (P = 0.008). (medworm.com)
  • Unilateral single semicircular canal occlusion (USSCO) is an effective treatment for some cases of intractable vertigo. (rsc.org)
  • In this study, we performed surgery of unilateral single semicircular canal occlusion (USSCO) on guinea pigs, and investigated the change of 5-HT by in vivo microdialysis of the medial vestibular nucleus (MVN) coupled with high-performance liquid chromatography and electrochemical detection (HPLC-ECD). (rsc.org)
  • symptoms
  • Sound or pressure can trigger abnormal activation of the balance canals in the ear, which in turn leads to a wide range of distressing and disabling symptoms. (eurordis.org)
  • nystagmus
  • We describe in detail the various types of nystagmus, according to the canals involved, which are the keypoint to accurate diagnosis. (nih.gov)
  • The previously described profile of nystagmus correlates with the known neuromuscular pathways that arise from stimulation of the posterior canal ampullary nerves in animal models and humans [9, (nih.gov)
  • mammals
  • Among species of mammals, the size of the semicircular canals is correlated with their type of locomotion. (wikipedia.org)
  • These observations raise the possibility that orthogonality, symmetry, and coplanarity are misleading descriptors of semicircular canal orientation in mammals, and that deviations from these norms could have significant functional consequences. (utexas.edu)
  • Berlin JC, Kirk EC, Rowe TB (2013) Functional Implications of Ubiquitous Semicircular Canal Non-Orthogonality in Mammals. (utexas.edu)
  • Movement
  • The orientations of the canals cause a different canal to be stimulated by movement of the head in different planes, and more than one canal is stimulated at once if the movement is off those planes. (wikipedia.org)