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Accuracy of the bedside head-impulse test in detecting vestibular hypofunction
  1. M Jorns-Haderli (mirjam.jorns{at}gmx.ch)
  1. Zurich University Hospital Neurology Department, Switzerland
    1. D Straumann (dominik{at}neurol.unizh.ch)
    1. Zurich University Hospital Neurology Department, Switzerland
      1. A Palla (antpalla{at}access.unizh.ch)
      1. Zurich University Hospital Neurology Department, Switzerland

        Abstract

        Objective: To determine the accuracy of the bedside head impulse test (bHIT) by direct comparison with results from the quantitative head impulse test (qHIT) in the same subjects and to investigate whether bHIT sensitivity and specificity changes with neuro-otological training.

        Methods: Video-clips of horizontal bHIT to both sides were produced in patients with unilateral and bilateral peripheral vestibular deficits (VD; N=15) and healthy subjects (N=9). For qHIT, eye and head movements were recorded with scleral search coils on the right eye and the forehead. Clinicians (neurologists or otolaryngologists) with at least 6 months of neuro-otological training (″experts″: N=12) or without this training (″non-experts″: N=45) assessed video-clips for ocular motor signs of VD on either side or for normal vestibular function.

        Results: On average, bHIT sensitivity was significantly (t-test: p<0.05) lower for experts than non-experts (63% vs. 72%), while bHIT specificity was significantly higher for experts than non-experts (78% vs. 64%). This outcome was a consequence of the experts' tendency to accept bHIT with corresponding borderline qHIT values as still being normal. Fitted curves revealed that at the lower normal limit of qHIT, 20% of bHIT were rated as deficient by the experts and 37% by the non-experts.

        Conclusions: When qHIT is used as reference, bHIT sensitivity is adequate and therefore clinically useful in the hands of both neuro-otological experts and non-experts. We advise to perform search-coil head impulse testing or high speed video methods, when bHIT is not conclusive.

        • bedside test
        • head-impulse test
        • neuro-otology
        • vestibular function
        • vestibulo-ocular reflex

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