title: [Evaluation of the vestibular ocular reflex in patients with unilateral peripheral vestibular disorder by the head impulse test].
abstract: OBJECTIVE
  To evaluate the function of vestibular ocular reflex (VOR) in patients with unilateral peripheral vestibular disorder (uPVD) by the head impulse test (HIT).
  
  
  METHODS
  The HIT and caloric test were carried out in 135 cases of patients with uPVD. The results of HIT were considered as normal (negative reaction) and abnormal (positive reaction). The results of vestibular function evaluated by caloric test were divided into three kinds, including normal, decreased and deficit according to the degree of canal paresis as less than 30 percent, from 30 to 99 percent, and equal to 100 percent, respectively. The sensitivity, specificity, positive and negative predictive value of HIT in assessing the vestibular function was analyzed.
  
  
  RESULTS
  For the 135 patients with uPVD, the HIT was normal in 90 (66.7%) cases and abnormal in 45 (33.3%) cases. When the caloric test was normal, the HIT was normal or abnormal in 58 cases and 6 cases, respectively. And when the canal paresis was from 30 to 99 percent, the HIT was normal or abnormal in 28 and 24 cases, respectively. When the vestibular function was deficit (CP was 100%), the HIT was normal or abnormal in 4 cases and 15 cases, respectively. When the results of caloric test were considered as the standard method to evaluate the VOR, the sensitivity, specificity, positive and negative predictive value of HIT were 54.9%, 90.6%, 86.7%, and 64.4%, respectively.
  
  
  CONCLUSIONS
  When assessing the function of VOR in patients with uPVD, the HIT could not replace the caloric test, but it can be a supplementary method. The information from both the HIT and caloric test can be combined to evaluate the patients with vestibular hypofunction comprehensively.
authors.affiliation: Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Wei-Jia
authors.initials: WJ
authors.lastname: Kong
mesh_terms: D000328:Adult; D002150:Caloric Tests; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012027:Reflex, Vestibulo-Ocular; D012680:Sensitivity and Specificity; D015837:Vestibular Diseases / Q000175:diagnosis / Q000503:physiopathology*; D014724:Vestibular Function Tests / Q000379:methods*; D055815:Young Adult