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Related Experiment Video

Updated: May 29, 2026

Testing of all Six Semicircular Canals with Video Head Impulse Test Systems

Testing of all Six Semicircular Canals with Video Head Impulse Test Systems

Published on: April 18, 2019

Bilateral simultaneous caloric test for superior semicircular canal evaluation.

Jade Nehme¹, Issam Saliba

¹Department of Otolaryngology-Head and Neck Surgery, Montreal University Hospital Center, Montreal, Quebec, Canada.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|September 30, 2011

Summary

The modified bilateral simultaneous caloric test (BSCT) can specifically stimulate the superior semicircular canal (SCC) in humans. This method offers a reliable way to assess superior SCC function, especially after surgery.

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Published on: May 23, 2013

Area of Science:

Vestibular neurophysiology
Otolaryngology
Neuroscience

Background:

The superior semicircular canal (SCC) plays a crucial role in detecting vertical head movements.
Assessing superior SCC function is vital for diagnosing and managing vestibular disorders.
Current methods for stimulating the superior SCC are limited, particularly in clinical settings.

Purpose of the Study:

To determine if the superior SCC can be selectively stimulated using a modified bilateral simultaneous caloric test (BSCT).
To evaluate the efficacy of the modified BSCT in assessing superior SCC function in healthy individuals and patients with superior SCC obliteration.

Main Methods:

A prospective study was conducted involving 12 healthy individuals and 12 patients with unilateral superior SCC obliteration.
A modified BSCT involved simultaneous cold water irrigation of both ears (24°C) to inhibit horizontal SCC response.
Caloric response (nystagmus intensity) was measured in three head positions: midline, head rotated right, and head rotated left.

Main Results:

Vertical, upbeating nystagmus was observed, indicating superior SCC stimulation.
Statistically significant differences in nystagmus intensity were found between healthy individuals and patients with superior SCC obliteration (p < 0.001).
A significant difference in nystagmus intensity was also observed between stimulated and obliterated superior SCCs (p = 0.003).

Conclusions:

The modified BSCT successfully and specifically stimulates the superior SCC in humans.
This technique provides a valuable tool for estimating superior SCC stimulation intensity, particularly in the post-surgical context.