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The caloric irrigation test.

N T Shepard1, G P Jacobson2

  • 1Department of Otolaryngology, Mayo Clinic, Rochester, MN, USA.

Handbook of Clinical Neurology
|September 18, 2016
PubMed
Summary
This summary is machine-generated.

The caloric thermal irrigation test, a historical method for assessing peripheral vestibular sensitivity, remains crucial for comparing right versus left vestibular function. Recent research has partially verified its underlying physiology, highlighting its continued importance in evaluating horizontal canal function.

Keywords:
electronystagmographyotolith organssemicircular canalsthermal irrigationsvestibulo-ocular reflexvideo-nystagmography

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Area of Science:

  • Neurology
  • Otolaryngology
  • Vestibular System Physiology

Background:

  • The caloric thermal irrigation test is a long-standing diagnostic tool, originating in the late 1800s, for evaluating peripheral vestibular system sensitivity.
  • Historically, it has been the primary method for assessing the relative function of the left and right peripheral vestibular systems.
  • The test specifically targets the horizontal semicircular canals, with minimal influence from the vertical canals.

Purpose of the Study:

  • To review and analyze various caloric thermal irrigation protocols developed over time.
  • To interpret the findings from these protocols and recommend those that are both effective and practical for clinical use.
  • To discuss the current understanding and partial experimental verification of the physiological basis of caloric testing, particularly through microgravity research.

Main Methods:

  • Review of historical and contemporary protocols for caloric thermal irrigations applied to the external auditory canals.
  • Analysis of the interpretation of results from different caloric testing protocols.
  • Consideration of practical aspects and performance of various recommended protocols.

Main Results:

  • The core utility of the caloric test remains the comparative assessment of right versus left peripheral vestibular sensitivity.
  • The test's application is primarily relevant to the horizontal semicircular canals.
  • The physiological mechanisms underlying the caloric response have been partially validated by recent studies, including those conducted in microgravity.

Conclusions:

  • Caloric thermal irrigation is a valuable and practical method for evaluating peripheral vestibular function, especially for individual horizontal canal assessment.
  • The test's historical significance is matched by its continued relevance in modern neurotology.
  • Ongoing research continues to refine our understanding and application of this foundational vestibular diagnostic tool.