Chapter 59: Managing Hearing & Balance Disorders

Managing Hearing & Balance Disorders nursing chapter, detailing the assessment and management of hearing and balance disorders, begins by establishing the intricate anatomy and physiology of the ear, emphasizing its dual role in processing sound perception and maintaining equilibrium. Key structures covered include the external ear, responsible for sound collection; the middle ear, featuring the tympanic membrane and the ossicles (malleus, incus, stapes) which transmit mechanical sound energy; and the inner ear, containing the cochlea, the end organ for hearing, and the semicircular canals, crucial for balance maintenance. Assessment techniques range from gross auditory acuity tests like the Weber and Rinne tests, used to differentiate between conductive hearing loss (interrupted sound transmission to the inner ear) and sensorineural hearing loss (damage to the cochlea or cranial nerve VIII), to specialized diagnostic procedures such as audiometry, tympanometry, and electronystagmography, which evaluates the vestibular system and involuntary eye movement (nystagmus). The chapter identifies several conditions impacting the external ear, such as cerumen impaction and external otitis (otitis externa), and middle ear disorders, including acute and chronic otitis media, tympanic membrane perforation, and otosclerosis, where abnormal spongy bone fixates the stapes. Management strategies for the middle ear often involve surgical reconstruction, specifically tympanoplasty for membrane repair, ossiculoplasty for middle ear bones, or mastoidectomy to address chronic infection and mass formation like cholesteatoma. Furthermore, the content explores inner ear and balance disorders, differentiating between general dizziness and true vertigo (an illusion of movement), which is a cardinal symptom of conditions like Ménière’s disease—a disorder characterized by episodic vertigo, tinnitus, and fluctuating hearing loss due to endolymphatic hydrops—and benign paroxysmal positional vertigo (BPPV), often managed non-invasively using canalith repositioning. Other severe pathologies discussed include acoustic neuroma (a benign tumor of the vestibulocochlear nerve) and labyrinthitis (inner ear inflammation). Special attention is given to promoting effective communication for patients with hearing loss, acknowledging the cultural differences between Deaf culture and audiologic deafness, and reviewing aural rehabilitation methods. These methods include various types of hearing aids and advanced implanted devices, such as the cochlear implant, designed for patients with profound bilateral sensorineural loss. Prevention of hearing impairment focuses heavily on avoiding exposure to ototoxic medications and excessive noise levels (above 85 to 90 dB), which cause permanent damage to the hair cells of the organ of Corti.