Chapter 16: Ears

Ears explores the intricate mechanics of hearing pathways, differentiating between air conduction and bone conduction, and thoroughly explains the pathophysiology behind conductive, sensorineural, and mixed hearing loss, including mechanically induced otosclerosis and age-related presbycusis. The text emphasizes developmental variations across the lifespan, highlighting the anatomical susceptibility of infants to acute otitis media due to their shorter, more horizontal eustachian tubes, while also addressing adult and geriatric considerations like cerumen impaction and stiffening canal cilia. Key subjective assessment components instruct clinicians on gathering patient history regarding otalgia, otorrhea, environmental noise exposure, tinnitus, and the distinctions between objective and subjective vertigo. The objective physical examination framework outlines proper inspection and palpation techniques for the auricle, mastoid process, and external auditory meatus, followed by step-by-step instructions for proper otoscopic evaluation to accurately visualize the tympanic membrane's landmarks, such as the prominent cone of light, pars tensa, and the malleus. Clinical diagnostic techniques, including the whispered voice test, pure tone audiometry, and tuning fork assessments like the Weber and Rinne tests, are heavily detailed for screening auditory acuity. Furthermore, the chapter reviews a wide array of critical abnormal findings, equipping healthcare students and nursing professionals with the clinical knowledge to identify pathologies such as otitis externa, tympanic membrane perforations, cholesteatoma, hemotympanum, and the presence of tympanostomy tubes, ultimately culminating in evidence-based health promotion strategies regarding universal newborn hearing screening and early intervention protocols.