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The Rodent Model of Nonarteritic Anterior Ischemic Optic Neuropathy rNAION

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Nystagmus duration after caloric irrigations.

Charlotte Skipper¹, Richard Knight¹, Debbie Cane²

¹Audiology Department, Cambridge University Hospitals, Cambridge, UK.

International Journal of Audiology

|December 20, 2019

Summary

Caloric testing nystagmus duration is shorter than recommended, suggesting shorter intervals between warm and cool irrigations can improve efficiency. This study provides evidence for optimizing vestibular assessment times.

Keywords:

Caloric test interstimulus interval irrigations nystagmus duration slow-phase velocity

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Area of Science:

Vestibular system assessment
Oculomotor function
Neurotology

Background:

Caloric testing is a standard method for evaluating vestibular function.
Current guidelines recommend a 7-minute interval between caloric irrigations.
The optimal interval may be shorter, potentially improving clinical efficiency.

Purpose of the Study:

To measure nystagmus duration following warm and cool caloric irrigations.
To provide evidence for optimal intervals between caloric irrigation onsets.
To compare nystagmus durations and maximum slow phase velocity (SPV) between warm and cool irrigations.

Main Methods:

Participants underwent up to four caloric irrigations.
Nystagmus duration and maximum SPV were measured until nystagmus returned to baseline levels (within 2°/s).
Data from 52 vestibular assessment patients (99 ears) were analyzed.

Main Results:

Mean nystagmus duration was 3:04 minutes (183.9 seconds) from irrigation onset.
Nystagmus returned to minimal levels within 4:25 minutes (264.8 seconds) in 97.5% of participants.
No significant difference in duration or SPV was found between warm and cool irrigations.

Conclusions:

Nystagmus duration is substantially shorter than the currently recommended 7-minute interval between caloric irrigations.
Findings suggest shorter intervals are feasible, regardless of irrigation temperature or SPV.
Reducing caloric testing time can improve clinical efficiency in vestibular assessments.