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Related Experiment Videos

Testing utricular function by means of on-axis rotation.

K Helling1, U Schönfeld, H Scherer

  • 1Department of Otorhinolaryngology, Johannes Gutenberg-University Medical School, Mainz, Germany. helling@hno.klinik.uni-mainz.de

Acta Oto-Laryngologica
|May 25, 2006
PubMed
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Subjective visual vertical (SVV) estimation during rotation effectively screens utricle function. This method reveals isolated utricular disorders, even when semicircular canal function appears normal, improving dizziness diagnosis.

Area of Science:

  • Vestibular neurophysiology
  • Otolaryngology

Background:

  • The utricle is crucial for sensing linear acceleration and head tilt.
  • Assessing utricle function is vital for diagnosing vestibular disorders.

Purpose of the Study:

  • To evaluate subjective visual vertical (SVV) estimation during constant velocity yaw rotation as a screening test for utricle function.
  • To enhance detection of utricular asymmetry by holding the head on-axis.

Main Methods:

  • SVV was measured in 230 patients during stationary conditions and constant angular velocity (240°/s) yaw rotation.
  • Head was centered on-axis during rotation to maximize right-left utricular response asymmetry.
  • Bithermal caloric testing was performed in 201 patients.

Main Results:

Related Experiment Videos

  • 18.3% of patients with normal stationary SVV showed abnormal results during rotation.
  • Pathological SVV during rotation was significantly more pronounced than during stationary testing (p<0.001).
  • 44.4% of patients with normal caloric responses had pathological SVV estimates, increasing with unilateral weakness (54.3%) and loss (56.5%).

Conclusions:

  • SVV estimation during on-axis rotation is an efficient screening test for utricle function.
  • Isolated peripheral utricular disorders can be identified even with normal semicircular canal function.