Usability of the Video Head Impulse Test: Lessons From the Population-Based Prospective KORA Study

Area of Science:

• Neuroscience
• Otolaryngology
• Vestibular System Assessment

Background:

• The video head impulse test (vHIT) is a standard diagnostic tool for evaluating dizziness and vertigo.
• Previous research indicates technical challenges can limit the reliability and usability of vHIT.
• Understanding and mitigating these technical errors is crucial for accurate vestibular assessment.

Purpose of the Study:

• To investigate the frequency and types of technical mistakes in vHIT within a population-based study.
• To assess the impact of examiner experience and targeted training on vHIT quality.
• To identify key areas for improvement in vHIT protocols to enhance diagnostic accuracy.

Main Methods:

• A prospective, population-based study (KORA FF4) involving 681 participants.
• Three novice examiners were trained in vHIT, with weekly quality assessments by a neuro-otologist.
• Restrictive technical mistakes were documented, and examiners received individualized feedback and training.

Main Results:

• 3.2% of vHITs were uninterpretable due to technical errors, primarily goggle slippage (63.6%).
• Other significant errors included calibration issues (18.2%) and noise (13.6%).
• The rate of restrictive mistakes significantly decreased with experience and training (from 12% to 2.1%).

Conclusions:

• Technical errors in vHIT are few in number but critical, with goggle slippage being the most prevalent.
• Emphasis on secure goggle placement is vital for improving vHIT reliability.
• Structured training and experience effectively enhance vHIT quality, ensuring high diagnostic usability.