By Richard G Harvey; Sue Paterson
The research and administration of ear illness occupies a good portion of a veterinary clinician's time. Otitis externa, specifically, may be noticeable by means of a hectic small animal clinician once or more an afternoon. Otitis Externa: a necessary advisor to prognosis and remedy offers a entire resource of knowledge at the proper constitution, functionality, scientific remedy, and surgical procedure of the ear, from Read more...
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Additional info for Otitis Externa: An Essential Guide to Diagnosis and Treatment
Sample text
Approach to the Diagnosis of Otitis Externa Fig. 17 Crumbly, dry, blackish brown cerumen associated with Otodectes cynotis infestation. 23 Fig. 18 Grass awn, cerumen, and associated erythema in the external ear canal of a dog. Fig. 19 Polyp in the external ear canal of a cat. indd 23 20/2/14 6:24 PM Approach to the Diagnosis of Otitis Externa 24 Fig. 20 Acute tear in the tympanic membrane of a dog associated with grass awn penetration. Fig. 21 Chronic otitis media and otitis externa have resulted in a thickened, opaque, ruptured tympanic membrane.
In small dogs and cats collecting a shielded sample is difficult, and vertical canal samples will have to suffice5. If otitis media is suspected, a shielded sample should be taken from the middle ear in addition to that from the external ear canal. Most clinicians advocate using modified Wright’s stains such as Diff-Quik 1,4,5 . g. new methylene blue) because of the lipid nature of the otic discharge4. Griffin1 advocated heat fixing of obviously waxy preparations in order to prevent solvent-associated leaching of lipid.
27 High-power photomicrograph from the Cocker Spaniel in Fig. 24. Note the yeast and cocci on and around the squames, and the absence of inflammatory cells. Fig. 28 Unstained smears from normal ear canals are all but invisible. indd 26 20/2/14 6:25 PM Approach to the Diagnosis of Otitis Externa chronic, bilateral otitis associated with a thick, greasy exudate. 27) does not support this. Although there are increased numbers of squames and microbes visible, the lack of any inflam matory cells suggests a ceruminous otitis externa, probably associated with a more generalized defect in keratinization, rather than infection.