APEA Pathophysiology EENT Practice Exam 2026 – Complete Exam Prep

Sensorineural hearing loss is caused by damage to the hair cells in the cochlea, which are crucial for converting sound vibrations into electrical signals that the brain can interpret. When these hair cells are damaged, often due to factors such as aging, noise exposure, or ototoxic medications, the ability to perceive sound effectively diminishes, leading to sensorineural hearing loss. This type of hearing loss typically affects the clarity of sound and the ability to hear certain frequencies, resulting in difficulties in understanding speech, particularly in noisy environments.

In contrast, conductive hearing loss relates to problems in the outer or middle ear that prevent sound from being conducted properly to the inner ear and does not involve the cochlea's hair cells. Mixed hearing loss involves both conductive and sensorineural components, indicating issues in both the middle ear and the cochlea. A temporary threshold shift refers to a transient decrease in hearing sensitivity, often due to temporary exposure to loud sounds or other reversible conditions, rather than a permanent change attributed to hair cell damage.