title: Head-tilting stabilometry in patients with benign paroxysmal positional vertigo.
abstract: OBJECTIVE
  One of the pathologic conditions underlying benign paroxysmal positional vertigo (BPPV) is degeneration of the otolith organs. In this study, we examined changes in the parameters of stabilometry under an upright condition and head-tilt conditions in patients with BPPV.
  
  
  METHODS
  We performed stabilometry on 21 patients with right BPPV, on 21 patients with left BPPV and on 21 controls. First, the subject stood barefoot in an upright position with both feet together on the platform with eyes closed. Next, tilting of the head about 30 degrees to the left was added. Then, tilting about 30 degrees to the right was performed.
  
  
  RESULTS
  In right BPPV patients, the total length of velocity vectors in the right or left direction on right or left head-tilt were significantly smaller than those in an upright position. The enveloped area and total length of velocity vectors in the right or left direction were significantly larger than those in controls. In left BPPV patients, there were no parameters that showed any significant difference.
  
  
  CONCLUSIONS
  In this study, lesions of right BPPV patients were coincidentally more severe than those in left BPPV patients, and velocity vectors with head-tilts were significantly smaller than in an upright position. Using the total length of the velocity vectors, head-tilting stabilometry has the potential to become a reliable otolith function examination method.
authors.affiliation: Department of Otolaryngology, Niigata University, Faculty of Medicine, 1-757 Asahimachi-dori, Niigata 951-8510, Japan. inukent@hotmail.com
authors.forename: Kenya
authors.initials: K
authors.lastname: Inukai
authors.forename: Izumi
authors.initials: I
authors.lastname: Koizuka
authors.forename: Sugata
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004568:Electrodiagnosis; D004584:Electronystagmography; D005260:Female; D018069:Hair Cells, Vestibular / Q000502:physiology; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010037:Otolithic Membrane / Q000294:innervation* / Q000503:physiopathology; D004856:Postural Balance / Q000502:physiology*; D012016:Reference Values; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology; D012444:Saccule and Utricle / Q000294:innervation / Q000503:physiopathology; D012815:Signal Processing, Computer-Assisted; D014717:Vertigo / Q000209:etiology* / Q000503:physiopathology; D014724:Vestibular Function Tests; D000160:Vestibulocochlear Nerve Diseases / Q000175:diagnosis* / Q000503:physiopathology