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170 Disorders of the Auditory System
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B
Figure 4–10. continued
Audiologic Recommendations and Management
Due to the bacterial meningitis, which was diagnosed 1 week following the accident (see discussion in the following medical section), it was recommended that the patient be closely monitored audiologically. Both the patient and his parents were counseled to alert audiology immediately should any changes in hear­ing be noted. It was also recommended that a trial fitting with a contralateral routing of signal (CROS) hearing aid be considered.
Medical Recommendations and Management
The patient remained stable until approxi­mately 1 week following the accident. At which time, the patient’s recovery became complicated by a cerebrospinal fluid leak and bacterial meningitis. Due to these
complications, the patient was taken to the operating room by otolaryngology and neurosurgery for a left total facial nerve decompression and left transmas­toid and transcranial repair of the tem­poral bone. In addition, repair of a dural defect and placement of a lumbar drain was required. These procedures were completed without complication.
The patient was eventually dis­charged from the hospital. Prior to his discharge, his parents were counseled regarding the fact that it was unlikely their son would regain any hearing func­tion in his left ear and left facial nerve function would be monitored for possible recovery of or improvement. Postopera­tively, the patient has demonstrated no significant audiologic changes. To date, the patient continues to have left-sided facial paralysis and no residual hearing in the left ear. Hearing sensitivity and facial nerve function for the right side continues to be normal.
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171
C
Figure 4–10. continued
172 Disorders of the Auditory System
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otheR disoRdeRs
affecting the outeR
and
middle eaRs
External Otitis
External otitis is an infection of the ear canal and/or the pinna that is often noticed in the summer months and is commonly caused by swimming in water with high counts of bacteria. It is typi­cally caused by a bacterial invasion into the external ear canal. The most common bacteria is Pseudomonas. External otitis can also be related to fungal infections, but these are relatively rare. In viewing the ear canal, mucopurulent matter is usually observed along with redness and swell­ing of the tissue involved. The patient will complain of severe discomfort, especially when the pinna is moved. Audiologically, there is seldom much of an effect on hear­ing unless swelling closes the ear canal. Treatment of the patient includes cleaning of the affected area and topical application of antibacterial agents. These antibacte­rial agents are sometimes combined with corticosteroids, which may provide better treatment than antibacterial applications alone (Castillo & Roland, 2007).
block the ear canal. The presence of exos­toses in the ear canal may make it diffi­cult to visualize the tympanic membrane. If large enough to close off the ear canal, these growths can cause conductive hear­ing loss. The ear canal, especially if ceru­men is present, can be blocked by pushing cerumen against the exostoses when ear inserts are used. Therefore, care must be exercised when using ear insert receivers with patients with exostoses. Manage­ment of these patients usually involves surgical removal of the exostoses (Zender, Marzo, & Leonetti, 2007).
Osteomas are also bony growths and are often confused with exostoses. These, however, are usually singular in number and are located more laterally in the canal. They are a true neoplasm that is a mix of bone and fibrous tissue, and they tend to occur more often in children than in adults. Audiologically, the same concerns exist for osteomas as those mentioned for exostoses. Osteomas occasionally can be removed in the otolaryngologist’s office, but often a brief general anesthetic is required (Zender et al., 2007).
Tympanic Membrane Perforation
Exostoses and Osteomas
Exostoses are bony growths occurring in the medial (bony) portion of the ear canal (see Appendix 4H). These multiple bony growths seem to be related to cold water exposure and are often seen in swimmers. This is often a bilateral condition. Exosto­ses become bothersome only when they trap debris in the ear canal or become so large that they impinge on the eardrum or
Castillo and Roland (2007) provide a review of tympanic membrane perfora­tions from which we draw information. These perforations generally are related to trauma (blasts, penetrating injuries, head trauma, etc.) or infections, such as otitis media. Most tympanic membrane perforations will heal spontaneously unless they are large or are related to ongoing or recurring infections. They can occur in either the pars flaccida or pars tensa. However, if they occur in the pars
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flaccida, concern about cholesteatomas would be in order.
Long-standing perforations also her­ald concern over possible cholesteatomas. Small perforations generally do not yield hearing loss; however, large tympanic membrane perforations can result in up to 50 dB of hearing loss, although in most cases, the hearing loss is much less severe. Increased volume measures during tym­panometric testing are indications of tym­panic membrane perforations unless the patient has a PE tube in place. Careful oto­scopic exams should always be completed to determine if a tympanic membrane perforation is present. Care must also be taken during audiologic and vestibular (caloric) exams whenever a perforation is noted so that the tympanic membrane perforation is not further disturbed or contaminated. Treatment for tympanic membrane perforations that do not spon­taneously heal is otologic surgical repair (see Appendix 4I for an example of a tym­panic membrane perforation).
Tympanosclerosis
Tympanosclerosis is a condition in which white calcified plaques of connective tis­sue occur at and around the circumference of the tympanic membrane and/or the head of the malleus (Castillo & Roland,
2007) (see Appendix 4J for an example of tympanosclerosis). When these plaques are only on the tympanic membrane, the condition is called myringosclero­sis, which is more common than tym­panosclerosis. Both conditions are often associated with chronic otitis media and inflammatory processes of the middle ear. Myringosclerosis seldom yields a measur­able hearing loss; however, tympanoscle-
rosis can result in a hearing loss especially if it involves the ossicular chain. In cases with measurable hearing loss, the hearing loss will be a conductive hearing loss and the tympanograms will typically reveal slightly reduced compliance (Castillo & Roland, 2007).
Ossicular Chain Discontinuity
Multiple terms have been used to describe conditions affecting the ossicular chain where the normal articulation of the mid­dle ear bones is absent or disrupted (e.g., ossicular chain discontinuity, ossicular chain disarticulation, ossicular chain dis­location). Although this topic has been discussed to some extent in the section of this chapter that deals with temporal bone trauma, it is important to highlight that there are other etiologies that can result in this middle ear disorder. Ossicular chain discontinuity can be a result of various types of congenital abnormalities, necro­sis (secondary to chronic infections), and surgical interventions, as well as trauma (Castillo & Roland, 2007). The hearing loss noted in cases of ossicular chain dis­continuity typically is a conductive hear­ing loss; however, in some cases of head injury, the associated trauma may cause a subluxation of the ossicular chain with injury to the cochlea, which results in a mixed hearing loss (Castillo & Roland,
2007). Audiology plays a key role in the diagnosis of ossicular chain discontinuity in that near to maximum conductive loss is often observed in patients with ossicu­lar chain discontinuity. In addition, their tympanograms show hypercompliance, but no crossed acoustic reflexes even if hearing sensitivity is good in the acousti­cally stimulated ear. If the ossicular chain
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is subluxed or fibrous tissue has formed to keep the chain somewhat intact, the hear­ing may be relatively good with tympano­grams showing either normal or reduced compliance, and acoustic reflexes may be measured in some cases; however, if reflexes are noted, they are typically ele­vated (Jerger & Jerger, 1981). Treatment of ossicular chain discontinuity is oto­logic surgery to repair the dislocation or disarticulation of the ossicular chain and to resolve the conductive hearing loss that has resulted from the disarticulated ossicular chain. This surgical procedure involved is called ossiculoplasty (i.e., repair of the ossicular chain) and is quite successful with closure of the air-bone gap to within 10 dB slightly less than 75% of the time (Castillo & Roland, 2007).
summaRy
This chapter provided a brief overview of select conditions that affect the external and/or middle ears. Diseases of these por­tions of the auditory system are diverse in etiology and can have profound effects on auditory function. Appropriate manage­ment of these diseases requires a combi­nation of thorough history and physical examination, careful audiologic testing, and often appropriate diagnostic imaging. A clear understanding of these conditions and the implementation of appropriate management procedures (whether audio­logical or medical) can lead to improved auditory function and quality of life for those patients who present with external and/or middle ear disorders.
Acknowledgments. The authors grate-
fully acknowledge the contributions of
Matthew Bush, MD, PhD, Associate Pro­fessor, Department of Otolaryngology­Head and Neck Surgery, University of Kentucky, to this chapter.
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