Myogenic influences on the electrical auditory brainstem response (EABR) in humans

Area of Science:

• Neuroscience
• Audiology
• Biomedical Engineering

Background:

• Electrical auditory brainstem response (EABR) assesses auditory pathway function.
• Promontory stimulation is a technique used in EABR testing.
• Myogenic artifact can interfere with electrophysiological recordings.

Purpose of the Study:

• To demonstrate the effects of myogenic artifact on EABR using promontory stimulation.
• To evaluate the impact of neuromuscular paralysis on myogenic artifact and EABR.
• To establish protocols for accurate EABR acquisition with promontory stimulation.

Main Methods:

• Acquired intensity-response functions for EABR in unparalyzed subjects.
• Repeated EABR recordings after administration of a neuromuscular paralyzing agent.
• Analyzed the presence and intensity of myogenic responses relative to EABR components.

Main Results:

• Myogenic responses appeared at lower stimulus intensities than EABR components.
• Rapidly increasing myogenic responses at higher intensities obscured EABR identification.
• Neuromuscular paralysis effectively mitigated myogenic artifact interference.

Conclusions:

• Myogenic artifact poses a significant challenge for EABR using promontory stimulation.
• General anesthesia and neuromuscular blocking agents are essential for reliable EABR testing at the promontory site.
• Standardized protocols incorporating paralysis are needed to ensure accurate EABR interpretation.