Caloric test as a predictor tool of postural control in CI users

Area of Science:

• Audiology
• Neuroscience
• Vestibular System

Background:

• Postural control is vital for individuals with hearing loss.
• Cochlear implantation (CI) surgery aims to restore hearing but can impact vestibular function.
• Predicting post-operative balance outcomes is essential for patient management.

Purpose of the Study:

• To evaluate the predictive value of the pre-operative caloric test for postural control after unilateral CI surgery.
• To understand the relationship between vestibular assessment findings and balance recovery over one year.

Main Methods:

• A prospective observational study included 24 post-lingual deafness patients undergoing unilateral CI.
• Pre-operative and post-operative (up to 365 days) vestibular assessments included questionnaires, caloric tests, rotary chair (RC) testing, and computerized dynamic posturography (CDP).

Main Results:

• Most patients experienced improved dizziness and objective postural stability post-CI.
• Baseline caloric tests revealed varying degrees of vestibular dysfunction, including bilateral vestibular loss (BVL) in 25% of patients.
• Postural stability at 365 days was significantly better in patients with normal or partially impaired caloric test responses compared to those with BVL.

Conclusions:

• Balance improves significantly one year after CI in most patients.
• Pre-operative caloric test results are key predictors of long-term balance outcomes.
• Documenting pre-operative vestibular status is crucial for managing and predicting postural recovery following CI.