High stimulus rate brainstem auditory evoked potential in benign paroxysmal positional vertigo

Area of Science:

• Neuroscience
• Otolaryngology
• Audiology

Background:

• Benign Paroxysmal Positional Vertigo (BPPV) is a common inner ear disorder.
• The underlying mechanisms of BPPV are not fully understood.
• Brainstem Auditory Evoked Potential (BAEP) can assess auditory pathway function.

Purpose of the Study:

• To investigate the potential role of inner ear ischemia in BPPV pathogenesis.
• To evaluate the utility of BAEP at different stimulation rates in BPPV patients.
• To determine if BAEP can quantify inner ear ischemia in BPPV.

Main Methods:

• The study compared BAEP results between 81 idiopathic BPPV patients and 106 controls.
• BAEP was administered using high (49/s) and low (9/s) stimulation rates.
• Key metrics analyzed included difference in peak latencies between low and high stimulation rates (DPL I) and high peak latency (HPL I).

Main Results:

• BPPV patients showed significantly prolonged DPL I and HPL I in affected ears compared to controls and unaffected ears (p < 0.001).
• An abnormal DPL I rate was significantly higher in affected ears (62.65%) than unaffected (8.86%) or normal ears (3.77%).
• These findings indicate altered auditory nerve function related to BPPV.

Conclusions:

• Inner ear ischemia is a potential contributing factor to BPPV.
• DPL I derived from BAEP testing may serve as a quantitative measure of inner ear ischemia.
• This method shows promise for assessing ischemic degree in individuals over 20 years old with BPPV.