Long-term vestibulo-ocular reflex changes in patients with vestibular ablation

Area of Science:

• Otolaryngology
• Neuroscience
• Biostatistics

Background:

• Vestibulo-ocular reflex (VOR) function is crucial for visual stability.
• Inner ear ablative procedures can significantly impact VOR parameters.
• Understanding long-term VOR changes post-surgery is vital for patient rehabilitation.

Purpose of the Study:

• To analyze long-term changes in VOR parameters after ablative inner ear procedures.
• To identify predictors of VOR recovery, including frequency, age, and gender.
• To compare patient VOR outcomes against normative data.

Main Methods:

• Utilized multilevel statistical modeling on data from 84 patients.
• Tracked VOR parameters including gain, phase, DC bias, and asymmetry.
• Analyzed recovery trajectories over the postoperative period.

Main Results:

• Most VOR recovery occurred within 60 days, with stabilization around 120 days.
• Higher frequencies significantly predicted VOR outcomes.
• Age was a significant predictor for phase measures; gender had no effect.
• Sum gain remained below normative percentiles at higher frequencies.
• Phase generally remained within normal limits, except at the highest frequency.
• DC bias and asymmetry showed gradual decreases over time.

Conclusions:

• Multilevel modeling effectively characterized long-term VOR changes post-inner ear surgery.
• Frequency is a key factor influencing VOR recovery.
• While VOR parameters improve, some may not fully normalize, highlighting the need for continued monitoring and potential interventions.